---
description: "Key Potato Production Challenges  \r\nPotato protection should not be built around one disease or one pesticide. The commercial program needs to consider the crop above the soil, the developing tubers below the soil, and the quality requirements after harvest. \r\nImportant foliar disease directions include late blight,"
title: Potato Crop Protection and Tuber Quality Solutions – POMAIS
image: https://www.pomais.com/wp-content/uploads/2025/02/Potato-e1742377173923.webp
---

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# Potato Crop Protection and Tuber Quality Solutions

Potato crop protection begins before planting and continues through emergence, canopy development, tuber initiation, bulking, vine maturity, harvest, and storage preparation.

Unlike many field crops, commercial potato protection must consider both above-ground crop health and below-ground tuber quality. Late blight, seed-borne disease, Colorado potato beetle, aphid-transmitted viruses, nematodes, weeds, harvest damage, and storage rots can affect different stages of the same production cycle.

POMAIS supplies potato fungicides, insecticides, herbicides, seed and planting-stage treatment directions, nematicides, root-zone products, and selected harvest-support products for agrochemical importers, distributors, registration companies, wholesalers, and private-label brands.

We also support commercial projects with formulation selection, customized packaging, multilingual labels, technical documentation, quality control, and export preparation.

Potato [info@sunagros.com](https://www.pomais.com/author/infosunagros-com/)2026-10-23T08:49:03+00:00

## Key Potato Production Challenges

Potato protection should not be built around one disease or one pesticide. The commercial program needs to consider the crop above the soil, the developing tubers below the soil, and the quality requirements after harvest.

![Foliar Disease Pressure](https://www.pomais.com/wp-content/uploads/2026/09/Foliar-Disease-Pressure.webp "Foliar Disease Pressure")

### Foliar Disease Pressure

Important foliar disease directions include late blight, early blight, white mold, and other locally important canopy diseases.

Late blight can develop rapidly under favorable conditions and usually requires a planned fungicide program rather than a single rescue treatment.

![Soil and Tuber Disease Pressure](https://www.pomais.com/wp-content/uploads/2026/09/Soil-and-Tuber-Disease-Pressure.webp "Soil and Tuber Disease Pressure")

### Soil and Tuber Disease Pressure

Important soil- and tuber-associated problems can include:

Rhizoctonia and black scurf, black dot, common scab, powdery scab, pink rot, silver scurf, Fusarium dry rot, and other storage or tuber diseases.

These diseases do not all respond to the same fungicide or application method.

![Insect and Vector Pressure](https://www.pomais.com/wp-content/uploads/2026/09/Insect-and-Vector-Pressure.webp "Insect and Vector Pressure")

### Insect and Vector Pressure

Important potato insect directions include:

Colorado potato beetle, aphids, potato psyllid, potato tuberworm, flea beetles, cutworms, and other locally important pests.

Some of these pests damage foliage directly, while others are important because they transmit pathogens.

![Nematode and Root Zone Pressure](<> "Nematode and Root Zone Pressure")

### Nematode and Root-Zone Pressure

Potato production can be affected by potato cyst nematodes, root-knot nematodes, lesion nematodes, stubby-root nematodes, wireworms, and other below-ground problems.

Root-zone pressure can influence tuber number, shape, marketability, and long-term field productivity.

![Weed and Harvest Quality Pressure](<> "Weed and Harvest Quality Pressure")

### Weed and Harvest-Quality Pressure

Early weed competition can reduce crop establishment, while volunteer potatoes and perennial weeds can complicate disease, pest, and rotation management.

Later in the season, vine maturity, skin set, harvest damage, and storage-entry conditions become increasingly important.

## Browse Potato Protection Directions

### Potato Disease Management

Programs can address late blight, early blight, seed- and soil-borne disease, tuber disease, and selected storage-disease directions.

### Potato Insect and Vector Management

Insecticide programs can address Colorado potato beetle, aphids, potato psyllid, tuberworm, and selected soil or foliar pests.

### Potato Weed Management

Programs can include pre-plant, residual, pre-emergence, and selected post-emergence herbicide directions according to crop tolerance and weed spectrum.

### Seed Tuber and Planting-Stage Protection

Planting-stage programs can address seed-tuber disease, seed-piece wounds, Rhizoctonia, Fusarium, selected soil pathogens, and early insect pressure.

### Root-Zone and Nematode Management

Specialist products can be evaluated for nematodes, soil-borne disease, wireworms, and other below-ground production risks.

### Harvest and Storage Preparation

Late-season programs can include vine desiccation where locally approved, tuber-blight protection, harvest timing, skin-set management, and storage-disease risk reduction.

## Potato Crop Stage Protection Program

| Potato Stage | Main Protection Direction | Commercial Selection Focus |
| --- | --- | --- |
| Seed Tuber & Pre-Plant | Seed disease, Rhizoctonia, Fusarium, nematodes, weeds | Planting treatment, soil program, registration |
| Emergence | Stand establishment, CPB adults, cutworms, early weeds | Crop safety, scouting, early protection |
| Vegetative Growth | CPB larvae, aphids, early/late blight | Pest stage, canopy protection, MoA |
| Tuber Initiation | Late blight, soil disease, nematodes, weeds | Tuber protection, root-zone health |
| Tuber Bulking | Late/early blight, aphids, white mold, tuberworm | Canopy health, tuber quality |
| Vine Maturity | Late disease, tuber blight, desiccation | PHI, maturity, skin set |
| Harvest & Storage Entry | Bruising, wounds, tuber disease, storage rot | Harvest condition, handling, quality |

![Seed Tuber and Pre Plant](<> "Seed-Tuber-and-Pre-Plant")

### Seed Tuber and Pre-Plant

Potato protection begins with the planting material. Seed-tuber health, cutting and handling, soil-borne disease, nematode pressure, residual weed strategy, and field history should all be evaluated before planting. The planting-stage product should match the intended application method. A seed-piece dust, liquid tuber treatment, in-furrow treatment, and conventional FS seed-treatment formulation are not automatically interchangeable.

![Emergence](<> "Emergence")

### Emergence

During emergence, uneven stands can result from seed-tuber decay, Rhizoctonia, soil insects, poor soil conditions, or crop injury. Colorado potato beetle adults, flea beetles, cutworms, and early weeds may also become visible. The main commercial objective at this stage is uniform establishment without unnecessary crop stress.

![Vegetative Growth](<> "Vegetative-Growth")

### Vegetative Growth

As the canopy develops, disease and insect pressure can increase quickly. Colorado potato beetle larvae, aphids, early blight, and late-blight infection risk become important monitoring directions. Late-blight protection should begin according to disease risk and local recommendations rather than waiting for severe field symptoms.

![Tuber Initiation](<> "Tuber-Initiation")

### Tuber Initiation

As stolons begin forming tubers, below-ground protection becomes increasingly important. Soil moisture, nematodes, tuber disease, weed competition, and late-blight pressure should be considered together. A product that protects foliage does not automatically protect developing tubers from all soil-borne diseases.

![Tuber Bulking](<> "Tuber-Bulking")

### Tuber Bulking

During tuber bulking, maintaining a functional canopy supports crop development, but unnecessary pesticide applications should be avoided. Important directions can include late blight, early blight, white mold, aphid populations, potato psyllid, tuberworm, and root-zone pressure.

![Vine Maturity](<> "Vine-Maturity")

### Vine Maturity

Late-season protection should increasingly consider tuber maturity and harvest preparation. Late blight, tuber-blight risk, vine desiccation, PHI, maximum application numbers, and destination-market residues become more important.

![Harvest and Storage Entry](<> "Harvest-and-Storage-Entry")

### Harvest and Storage Entry

Crop protection does not finish when the vines die. Mechanical injury, skin damage, harvest wounds, infected tubers, storage temperature and humidity management, and ventilation can affect post-harvest quality. The objective is to deliver sound tubers into storage or processing rather than simply producing a green crop canopy.

## Seed Tuber Health Starts the Potato Protection Program

Potato planting material is itself a tuber, which creates different disease-management requirements from conventional true-seed crops.

### Seed-Borne and Tuber-Borne Disease

Important planting-material directions can include:

- Fusarium dry rot
- Rhizoctonia
- Silver scurf
- Blackleg risk
- Other locally important seed-tuber diseases

Certified, healthy planting material remains the foundation of the program.

### Seed-Piece Wounds

Cut seed pieces create fresh wound surfaces.

Handling damage, poor wound healing, unsuitable storage, and contaminated equipment can increase the opportunity for secondary infection.

A fungicide treatment cannot compensate for severely deteriorated planting material.

### Planting-Stage Product Selection

Commercial programs can include:

- Seed-tuber treatments
- Seed-piece fungicides
- In-furrow fungicides
- Soil-applied insecticides
- Nematicides
- Biological or specialty products where locally registered

The application method should be confirmed carefully because formulations designed for true-seed treatment should not automatically be used on cut potato seed pieces.

## **Common Potato Diseases**

#### **1. Late Blight (Phytophthora infestans)**

**Impact:**  
 Late blight is one of the most devastating diseases for potato crops, causing rapid decay of the leaves, stems, and tubers. It can spread quickly, especially under cool, wet conditions, and lead to substantial crop loss.

**Symptoms:**

- Dark, water-soaked lesions on leaves and stems, often surrounded by a yellow halo.
- White, cotton-like growth under wet conditions, particularly on the undersides of leaves.
- Tuber rot, which leads to the production of dark, sunken lesions on the tubers.

**Control Methods:**

- **Critical Control Period:** From the early vegetative stage to the tuber formation period.
- **Recommended Pesticides:** Fungicides like *Mancozeb*, *Copper-based fungicides*, and *Metalaxyl* are effective in controlling late blight.

#### **2. Early Blight (Alternaria solani)**

**Impact:**  
 Early blight is a fungal disease that affects both leaves and stems, leading to reduced photosynthesis and poor tuber development. In severe cases, early blight can cause premature defoliation and yield loss.

**Symptoms:**

- Concentric, dark brown or black spots with yellow halos on older leaves.
- Lesions that enlarge, causing tissue necrosis.
- Defoliation leading to poor growth and decreased yield.

**Control Methods:**

- **Critical Control Period:** During early to mid-growing season.
- **Recommended Pesticides:** Fungicides such as *Azoxystrobin* or *Chlorothalonil* are effective in controlling early blight.

![Potato Late Blight](<> "Potato Late Blight")

![Potato Early Blight](<> "Potato Early Blight")

[![Mancozeb](<> "Mancozeb")](https://www.pomais.com/product/mancozeb/)

Mancozeb

Mancozeb

[![Metalaxyl 35 WP 3](<> "Metalaxyl 35% WP")](https://www.pomais.com/product/metalaxyl/)

Metalaxyl 35% WP

[![Metalaxyl M 124 gL Azoxystrobin 322 gL SE](<> "Metalaxyl-M 124 gL + Azoxystrobin 322 gL SE")](https://www.pomais.com/product/metalaxyl-m-124-g-l-azoxystrobin-322-g-l-se/)

Metalaxyl-M 124 gL + Azoxystrobin 322 gL SE

[![Metalaxyl M 37.5 gL Chlorothalonil 500 gL SC](<> "Metalaxyl-M 37.5 gL + Chlorothalonil 500 gL SC")](https://www.pomais.com/product/metalaxyl-m-37-5-g-l-chlorothalonil-500-g-l-sc/)

Metalaxyl-M 37.5 gL + Chlorothalonil 500 gL SC

## Main Potato Diseases and Management Recommendations

#### Bacterial Ring Rot (Clavibacter sepedonicus)

Bacterial ring rot is a seed-borne vascular disease that causes wilt and internal tuber decay. Infected plants show yellowing and wilting of lower leaves, with creamy, cheese-like rot forming a distinct ring in the tuber’s vascular tissue. When pressure is applied, creamy ooze may appear from the cut surface.  
**When it appears:** During mid to late growth, particularly if contaminated seed or equipment is used. It can persist for years on unclean tools and containers.  
**Management:** There is no curative treatment. Prevent introduction by planting **certified disease-free seed**, disinfecting equipment, and destroying infected lots. Copper bactericides can slightly suppress surface bacteria but are not systemic. Rotation and hygiene are critical.

#### Bacterial Soft Rot & Blackleg (Pectobacterium and Dickeya spp.)

These bacteria attack the stems and seed pieces, producing a soft, foul-smelling decay. Blackleg symptoms include black, slimy stems, wilted leaves, and poor stands from decayed seed pieces.  
**When it appears:** Early season under cool, wet soil followed by warm weather. Poor aeration and mechanical injury accelerate infection.  
**Management:** Use well-suberized seed, avoid planting in water-logged soils, and ensure seed cutters and planters are disinfected daily. Warm seed before cutting and apply **fungicidal seed treatments** containing **fludioxonil** or **thiabendazole** to reduce secondary rots. Keep storage temperatures below 10 °C and maintain airflow.

#### Black Dot (Colletotrichum coccodes)

A soil-borne fungus that forms minute black dots (microsclerotia) on tubers and stems. Infected plants exhibit premature vine death and reduced tuber size.  
**When it appears:** Common late in the season, especially following stress such as drought or heavy early blight infection.  
**Management:** Employ 3–4-year rotations, avoid continuous potato cropping, and improve soil drainage. Fungicides containing **azoxystrobin**, **boscalid**, or **penthiopyrad** applied to soil or foliage can reduce incidence.

#### Calico (mixed viral symptoms)

“Calico” describes a mosaic pattern of light and dark green patches on leaves, caused by mixed infections (often PVY and Alfalfa mosaic virus). It reduces photosynthetic efficiency and tuber yield.  
**When it appears:** Anytime during growth but most visible from mid-season. Spread mainly by aphids.  
**Management:** Plant certified seed; remove infected plants; control aphid vectors with **imidacloprid**, **acetamiprid**, or **flupyradifurone**; eliminate weedy virus reservoirs.

#### Charcoal Rot (Macrophomina phaseolina)

Causes a dry, gray-black rot at the stem base, with tiny black sclerotia that resemble charcoal dust. It develops in hot, dry soils when plants are water-stressed.  
**When it appears:** Late season, especially in sandy fields with high temperature and low humidity.  
**Management:** Maintain irrigation, increase organic matter, and rotate with non-host crops (cereals). No reliable fungicides exist, but **azoxystrobin** or **flutolanil** can suppress outbreaks.

#### Common Scab (Streptomyces scabies)

Produces corky or raised lesions on tuber surfaces, making them unsightly though not decayed. Infection occurs as new tubers form.  
**When it appears:** During tuber initiation in warm, dry soils with high pH (>5.2).  
**Management:** Maintain **consistent soil moisture** for 2–4 weeks after tuber set, avoid fresh manure, and apply acidifying fertilizers. No chemical control is fully effective; focus on irrigation and crop rotation.

#### Corky Ringspot (Tobacco rattle virus)

The disease causes brown concentric rings inside the tuber and mild leaf chlorosis. It’s transmitted by stubby-root nematodes.  
**When it appears:** In sandy soils with nematode populations, visible at harvest.  
**Management:** Control nematode vectors using **fluopyram**, **fosthiazate**, or **oxamyl**, and rotate away from host crops. Clean seed and nematode testing are recommended.

#### Cucumber Mosaic Virus (CMV)

Results in mottled, distorted leaves and yield reduction. Aphids transmit CMV non-persistently.  
**When it appears:** Warm seasons with high aphid movement.  
**Management:** Use virus-free seed, remove alternate hosts, and suppress aphids with systemic insecticides such as **imidacloprid** or **thiamethoxam**. Mineral oil sprays can help reduce transmission.

#### Curly Top (Beet curly top virus)

Symptoms include leaf curling, thickened brittle foliage, and purple discoloration. Plants are severely stunted and often produce no tubers.  
**When it appears:** When beet leafhopper populations migrate into potato fields, usually in dry, warm weather.  
**Management:** Apply **lambda-cyhalothrin** or **deltamethrin** early in migration periods, manage weeds that harbor vectors, and use tolerant cultivars where available.

#### Phytoplasma Diseases (e.g., Aster yellows)

Caused by wall-less bacteria spread by leafhoppers. Symptoms are yellow or purple leaves, multiple small shoots (“witches’ broom”), and deformed tubers.  
**When it appears:** Warm periods favoring leafhopper activity.  
**Management:** Suppress leafhoppers, eliminate weeds, and remove infected plants. There is no chemical cure once infected.

#### Early Blight (Alternaria solani)

Produces characteristic “target-spot” concentric rings on lower leaves, leading to premature defoliation.  
**When it appears:** From canopy development through maturity, especially under dry stress followed by humidity.  
**Management:** Use **protectant fungicides** (chlorothalonil, mancozeb) starting early, rotating with **QoI** (azoxystrobin), **SDHI** (boscalid, fluopyram), or **DMI** (difenoconazole). Maintain nitrogen balance and remove old crop debris.

#### Fusarium Dry Rot & Seed Piece Decay (Fusarium spp.)

Causes shriveled seed pieces and internal dry cavities in stored tubers, with brownish, dry rot and concentric rings.  
**When it appears:** At cutting and during storage.  
**Management:** Cut and plant promptly; disinfect knives; treat seed with **fludioxonil** or **thiabendazole**; store at 3–4 °C with 90% humidity and good airflow.

#### Fusarium Wilt (F. oxysporum f. sp. tuberosi)

Infected plants show yellowing of lower leaves and one-sided wilt. Cutting stems reveals vascular browning.  
**When it appears:** Mid to late season in continuous potato fields.  
**Management:** Rotate with non-hosts for 4 years, maintain balanced irrigation, and control nematodes that worsen symptoms. No chemical cure is available.

#### Late Blight (Phytophthora infestans)

The most devastating potato disease. Causes water-soaked lesions on leaves, stems, and tubers, with white sporulation under humid conditions. Tubers rot in field and storage.  
**When it appears:** Cool (10–20 °C), wet weather with long leaf wetness periods.  
**Management:** Start fungicide protection before forecasted infection periods. Rotate **oxathiapiprolin**, **mandipropamid**, **cyazofamid**, **cymoxanil + chlorothalonil**, or **fluazinam**. Eliminate cull piles and volunteer potatoes to reduce inoculum.

#### Leafroll Virus (PLRV)

Leaves roll upward and become brittle; tubers may develop internal net necrosis. Transmitted by aphids.  
**When it appears:** Mid to late season after aphid buildup.  
**Management:** Certified seed, aphid control (**flupyradifurone**, **acetamiprid**), and removal of infected plants.

#### Mosaic Diseases (Potyviruses, PVY, PVA, PVS)

Show mottled, rugose, or streaked leaves, stunting, and reduced tuber set. Spread by aphids and infected seed.  
**When it appears:** Throughout the season.  
**Management:** Clean seed, vector control, removal of volunteer plants, and virus-resistant varieties.

#### Pink Rot (Phytophthora erythroseptica)

Tuber flesh turns pink after exposure to air, then brown or black. Often causes post-harvest storage leaks.  
**When it appears:** Waterlogged soils near harvest and warm storage.  
**Management:** Improve drainage, avoid over-irrigation, and apply **phosphorous acid** or **oxathiapiprolin** before harvest. Store dry, cool, and well-ventilated tubers.

#### Powdery Scab (Spongospora subterranea)

Creates raised pustules on tubers and root galling. The pathogen also transmits potato mop-top virus.  
**When it appears:** In cool, wet soils during tuber initiation.  
**Management:** Long rotations (5+ years), improved drainage, and partial protection from **fluazinam** seed treatments. Avoid infested fields.

#### Pythium Leak (Water Rot) (Pythium ultimum and others)

Causes watery, soft rot starting at wounds, often with a musty odor.  
**When it appears:** During warm, wet harvest and early storage.  
**Management:** Harvest only under dry conditions, cool quickly to below 10 °C, and avoid bruising. **Mefenoxam/metalaxyl** can protect wounded tubers when applied at harvest.

#### Sclerotium Stem Rot (Sclerotium rolfsii)

Forms white cottony mycelium and small mustard-seed sclerotia at the stem base, leading to wilting.  
**When it appears:** Hot, humid weather, especially in southern regions.  
**Management:** Deep plowing, crop rotation, and **flutolanil** or **azoxystrobin** soil treatment reduce inoculum.

#### Silver Scurf (Helminthosporium solani)

Causes shiny silver patches on stored tubers; severe infections lead to shriveling and weight loss.  
**When it appears:** Late season and during long storage at high humidity.  
**Management:** Apply **thiabendazole**, **fludioxonil**, or **imazalil** seed and post-harvest treatments; reduce humidity and improve ventilation in storage.

#### Stem & Stolon Canker (Black Scurf) (Rhizoctonia solani)

Results in uneven emergence, brown lesions on stolons, and black sclerotia (“dirt that won’t wash off”) on tubers.  
**When it appears:** Cool, wet soil conditions after planting.  
**Management:** Treat seed or soil with **flutolanil**, **pencycuron**, **sedaxane**, or **penflufen**. Avoid cold planting and improve drainage.

#### Verticillium Wilt (Verticillium dahliae, V. albo-atrum)

Causes one-sided wilt and yellowing, with vascular browning in stems. Yield losses increase when combined with nematodes.  
**When it appears:** Mid to late season in old potato soils.  
**Management:** 3–4 year rotations, nematode control, and resistant cultivars. Soil fumigation may help where permitted.

#### White Mold (Sclerotinia sclerotiorum)

Produces soft, water-soaked lesions on stems and foliage, with fluffy white mycelium and black sclerotia.  
**When it appears:** Cool, humid conditions around flowering and vine closure.  
**Management:** Increase canopy ventilation, control irrigation, and apply **boscalid**, **fluazinam**, **penthiopyrad**, or **iprodione** at early bloom. Remove plant debris after harvest.

![Colorado Potato Beetle Leptinotarsa decemlineata](<> "Colorado Potato Beetle (Leptinotarsa decemlineata)")

![Aphids Macrosiphum euphorbiae](<> "Aphids (Macrosiphum euphorbiae)")

[![Imidacloprid5WP](<> "Imidacloprid")](https://www.pomais.com/product/imidacloprid-insecticide/)

Imidacloprid

[![Thiamethoxam25SC](<> "Thiamethoxam25%SC")](https://www.pomais.com/product/thiamethoxam/)

Thiamethoxam25%SC

[![Acetamiprid20SP 2](<> "Acetamiprid20%SP")](https://www.pomais.com/product/acetamiprid/)

Acetamiprid20%SP

## **Common Potato Pests**

#### **1. Colorado Potato Beetle (Leptinotarsa decemlineata)**

**Impact:**  
 The Colorado potato beetle is a major pest that attacks both the foliage and stems of potato plants. Its feeding results in defoliation and can significantly reduce crop yield. The beetles also carry viruses that can further affect plant health.

**Symptoms:**

- Defoliation of leaves, resulting in reduced photosynthesis.
- Presence of yellowish larvae and adult beetles on the undersides of leaves.
- Stunted growth and poor tuber development due to the loss of foliage.

**Control Methods:**

- **Critical Control Period:** From the early vegetative stage through to tuber maturity.
- **Recommended Pesticides:** Insecticides such as *Imidacloprid*, *Thiamethoxam*, and *Pyrethroids* are effective in controlling the Colorado potato beetle.

#### **2. Aphids (Macrosiphum euphorbiae)**

**Impact:**  
 Aphids are sap-feeding insects that cause direct damage by sucking nutrients from the plants, which weakens the plants and results in yellowing and stunted growth. They are also vectors for several viral diseases.

**Symptoms:**

- Yellowing and wilting of leaves.
- The presence of aphids on the undersides of leaves.
- The secretion of honeydew, which attracts sooty mold.

**Control Methods:**

- **Critical Control Period:** From seedling stage to tuber maturity.
- **Recommended Pesticides:** Systemic insecticides like *Imidacloprid* and *Acetamiprid* can control aphid populations effectively.

## Key Insect Pests of Potato and Recommended Control

#### Aphids (Myzus persicae, Aphis gossypii, etc.)

**Description:** Small soft-bodied insects that suck sap from leaves and stems, causing leaf curling, yellowing, and transmitting viral diseases like PVY and PLRV.  
**Occurrence:** Usually appear from early vegetative to tuber bulking stages, especially under warm, dry conditions.  
**Recommended Insecticides:**

- *Imidacloprid* (systemic, long-lasting protection)
- *Acetamiprid* or *Thiamethoxam* (contact and systemic)
- *Pymetrozine* (anti-feeding effect, ideal for resistance management)

#### Beet Leafhopper (Circulifer tenellus)

**Description:** Small, wedge-shaped insects that feed on potato leaves and transmit *Purple Top* and *Aster Yellows* phytoplasma.  
**Occurrence:** Active during warm seasons; adults migrate into potato fields from nearby weeds.  
**Recommended Insecticides:**

- *Lambda-cyhalothrin* or *Deltamethrin* (quick knockdown)
- *Imidacloprid* (systemic protection in early season)
- *Thiamethoxam + Lambda-cyhalothrin* mixtures for extended control

#### Cutworms (Agrotis spp.)

**Description:** Caterpillars that hide in soil during the day and feed at night, cutting young stems near the soil surface.  
**Occurrence:** Most damaging during early crop establishment and cool, moist spring conditions.  
**Recommended Insecticides:**

- *Chlorpyrifos* (soil treatment before planting)
- *Lambda-cyhalothrin* or *Cypermethrin* (foliar application at night)
- *Indoxacarb* or *Emamectin benzoate* (targeting larvae)

#### Flea Beetles (Epitrix spp.)

**Description:** Tiny, jumping beetles that chew small round holes (“shot holes”) in leaves, reducing photosynthesis and vigor.  
**Occurrence:** Appear soon after emergence and persist through early growth.  
**Recommended Insecticides:**

- *Imidacloprid* or *Clothianidin* (seed or soil treatment)
- *Deltamethrin* (contact spray for adults)
- *Spinosad* (for resistance rotation, lower residue profile)

#### Potato Psyllid (Bactericera cockerelli)

**Description:** Small sap-sucking insect that transmits *zebra chip disease* caused by *Candidatus Liberibacter solanacearum*.  
**Occurrence:** From mid-season onward in warm, dry weather; populations increase rapidly if not managed early.  
**Recommended Insecticides:**

- *Abamectin* or *Spirotetramat* (target nymphs and adults)
- *Imidacloprid* or *Flupyradifurone* (systemic, long-lasting control)
- *Bifenthrin* (fast knockdown for heavy infestations)

#### Potato Tuberworm (Phthorimaea operculella)

**Description:** Moth larvae bore into tubers and leaves, creating galleries and increasing storage losses.  
**Occurrence:** Common in late season and during warm, dry storage conditions.  
**Recommended Insecticides:**

- *Chlorantraniliprole* (effective on larvae)
- *Emamectin benzoate* or *Lufenuron* (egg and larval control)
- *Bacillus thuringiensis (Bt)* for eco-friendly programs

#### Silverleaf Whitefly / Sweetpotato Whitefly (Bemisia tabaci)

**Description:** Tiny white insects found on undersides of leaves; cause chlorosis, sooty mold, and transmit viruses.  
**Occurrence:** Thrive under high temperature and dense canopy, mostly during mid to late season.  
**Recommended Insecticides:**

- *Pyriproxyfen* or *Buprofezin* (juvenile hormone inhibitors)
- *Imidacloprid* or *Thiamethoxam* (systemic protection)
- *Spiromesifen* or *Flupyradifurone* (for resistance management)

#### Wireworms (Agriotes spp.)

**Description:** Hard-bodied larvae of click beetles that feed on potato tubers, creating tunnels and reducing market quality.  
**Occurrence:** Persistent in fields with previous grass cover or poor rotation; damage occurs from planting to tuber bulking.  
**Recommended Insecticides:**

- *Fipronil* or *Chlorpyrifos* (soil treatment before planting)
- *Tefluthrin* (granule formulation at seeding)
- *Imidacloprid* (seed treatment for light infestations)

## **Impact of Potato Pests and Diseases**

The presence of pests and diseases in potato crops can lead to severe consequences:

- **Yield Loss:** Diseases like late blight and pests like the Colorado potato beetle can result in a significant reduction in yield.
- **Quality Degradation:** Fungal diseases like early blight can damage the appearance and quality of the potatoes, leading to a decrease in marketability.
- **Disease Transmission:** Pests like aphids can spread viral diseases, which can cause widespread crop damage.
- **Crop Failure:** In severe cases, unchecked pest and disease infestations can result in total crop loss.

## **Potato Pest and Disease Management Solutions**

#### **Control Indicators:**

- **Early Detection:** Monitoring for signs of pests and diseases at every growth stage is critical to prevent widespread damage.
- **Preventive Treatments:** Applying fungicides and insecticides before the onset of severe infestations can help maintain crop health.

#### **Critical Control Periods:**

- **Seedling to Early Vegetative Stages:** Control of pests such as aphids and the prevention of early blight is crucial during this stage.
- **Tuber Formation to Maturation:** Protecting plants from late blight and the Colorado potato beetle is essential during the later stages of growth.

#### **Recommended Pesticides:**

- **Fungicides:** *Mancozeb*, *Metalaxyl*, *Azoxystrobin*, and *Chlorothalonil* are effective in controlling late and early blight.
- **Insecticides:** *Imidacloprid*, *Thiamethoxam*, *Acetamiprid*, and *Pyrethroids* are recommended for controlling potato pests such as the Colorado potato beetle and aphids.

## Frequently Asked Questions

#### What potato crop-protection products does POMAIS supply?

POMAIS supplies potato fungicides, insecticides, herbicides, nematicide directions, planting-stage products, root-zone products, and selected harvest-support formulations.

#### Why is potato late blight different from early blight?

Late blight is caused by the oomycete *Phytophthora infestans*, while early blight is primarily associated with *Alternaria solani*. They have different biology and require different fungicide-selection logic.

#### How should a potato late-blight fungicide program be selected?

Consider local disease pressure, weather, crop stage, preventive versus early-infection role, FRAC group, pathogen sensitivity, partner fungicides, permitted application numbers, and the approved local label.

#### Can one late-blight fungicide be used throughout the whole season?

Relying repeatedly on one mode of action can increase resistance-selection pressure. A structured program should use effective FRAC groups according to local resistance-management recommendations.

#### Can insecticides prevent all PVY transmission?

No. PVY can be transmitted by aphids during very short probing events. Insecticides can reduce aphid populations but should not be presented as complete prevention of non-persistent PVY transmission.

#### What is the relationship between potato psyllid and zebra chip?

Potato psyllid can transmit *Candidatus Liberibacter solanacearum*, which is associated with zebra chip disease and internal tuber discoloration.

#### Why are seed-tuber treatments important?

Potatoes are propagated using tubers, so planting material can carry diseases such as Fusarium, Rhizoctonia, silver scurf, or other locally important pathogens. Healthy certified planting material and correct treatment are therefore important.

#### What are the main nematode directions in potato?

Important groups can include potato cyst nematodes, root-knot nematodes, lesion nematodes, and stubby-root nematodes depending on the production region.

#### What is potato vine desiccation?

Vine desiccation is a harvest-preparation practice used in some potato production systems to terminate green haulm and support harvest scheduling and crop maturity. Product availability depends strongly on local regulation.

#### Can POMAIS build a private-label potato portfolio?

Yes. POMAIS can support product selection, formulation specifications, private-label packaging, multilingual labels, technical documents, quality control, registration-support materials where available, and export preparation.

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