Prevention of Potato Diseases and Pests

In vegetable cultivation, farmers often face challenges from pests and diseases, and potatoes are no exception. So how can potato growers prevent and manage these threats? Below, we’ll explore pest and disease control strategies for each stage of the potato growing cycle.
1. Soil Treatment
Use beneficial microorganisms to improve soil health, reduce the incidence of pests and diseases, and increase crop yields.
Fertilization method: Apply 120–200 kg of base bio-organic fertilizer, supplemented with 125–150 kg of an active humic acid compound fertilizer (e.g., 17-17-17S or 16-9-20S). For fields with severe disease pressure, add 2–3 kg per mu of JunChongFeng.
2. Sowing
Sowing at the right time and maintaining an appropriate seeding depth are key to increasing yield.
Sowing method: Sow in early March. Form ridges approximately 15 cm high and 75 cm wide, with double rows planted at a row spacing of 30 cm and a plant spacing of 25 cm. For clay soils, sow at a depth of 8 cm; for sandy soils, sow at a depth of 12 cm. After sowing, cover the seeds with soil, level the surface, and apply a herbicide.
3. Control during the seedling stage
During the seedling stage, potatoes require control of viral diseases, blackleg, bacterial wilt, aphids, and underground pests.
Control methods: After uniform emergence, apply 10–20 L of Gui Gentao Di or 5–10 L of a heavy‑crop‑resistant composite microbial agent via flush application; it can also be used for root drenching.
4. Target pests and diseases during the growth period
During the growing period, it is necessary to prevent and control late blight, early blight, bacterial wilt, scab, blackleg, black spot, and noctuid moths, among others.
Key tasks during the growing period: Carry out intertillage and soil loosening to ensure the tuber‑forming layer remains loose and well‑aerated, promoting root development, stolon elongation, and tuber enlargement. After uniform emergence, perform the first intertillage at a depth of 8–10 cm, combined with weed control. Ten to fifteen days after the first intertillage, conduct a second, slightly shallower pass. When buds begin to form, carry out a third intertillage, even shallower than the second, and combine it with hilling; keep the hill height no more than 10 cm. If mulch film is in place, hill directly over the film.
Control methods: Use Hurricane + Lvheng No. 6 + Kangli + Shidingkang, or alternatively Yinlishen + Laigen + Aiqiu, applying by alternate spraying every 7–10 days.
5. Pests and diseases to be controlled during the flowering period
The target pests and diseases include late blight, early blight, scab, black spot, underground pests, thrips, leaf miners, red spider mites, and noctuid moths, among others.
Key points during the flowering period: In the early bud stage, apply 25 kg of potassium sulfate–based compound fertilizer along with 40 kg of the base fertilizer “Super Energy”; if flowering is excessive, pinch off the flower buds.
Control measures: Apply Hurricane, Lvheng No. 6, SM6, and Shunfaning; or use thiodiazole copper, Lvheng No. 10, Tianbao, and abamectin, with applications spaced 7–10 days apart, rotating among these products.
6. Target pests and diseases during the fruit enlargement stage
The primary targets for control and prevention include early blight, late blight, anthracnose, scab, and noctuid moths, among others.
Key focus during the fruit‑expansion stage: control excessive vegetative growth and promote fruit enlargement. Apply Tianbao combined with a soluble cola‑type fertilizer via irrigation, foliar spray every 7–10 days for 2–3 consecutive applications; to enhance cold resistance, add 5 million units of penicillin. Keep the soil consistently moist to prevent drought.
Control methods: Use Gongzu + Lvheng No. 6 + Laiguo + Avermectin; or Cuiseng + Dimethomorph + Tianbao + Shidingkang; or Thiazole copper; or Lvheng No. 10 + Genjing Huangjin, rotating these formulations for foliar sprays. For overly vigorous growth, apply Naibai + Naipu 9 consecutively 1–2 times.