When is the best time to apply insecticide to corn?

During the growth period, corn can be affected by various diseases and pests, and insect pests are the most common, so control measures should be taken well when planting. So when should insecticide be applied to corn?

1. When should insecticide be applied to corn?

Corn insecticide is usually applied before corn tasseling, and the specific times are 9-10 am and after 16:00 in the afternoon. When killing insects, effective and harmless pesticides should be selected according to the type of pest, living habits, developmental stage and the sensitivity of the crop to the pesticide, so that the pesticide effect can be fully exerted.

2. What insecticides are there for corn?

Corn insecticides include imidacloprid, acetamiprid, pymetrozine, nitenpyram, thiamethoxam and so on. However, because there are many types of insect pests, quite a lot of pesticides are used, and the specific choice should be made according to the symptoms. Control methods for each pest at each stage:

1. Sowing period: mainly to control underground pests and diseases spread by seeds.

(1) Use seed coating, or use 200-250 grams of 50% phoxim emulsifiable concentrate per mu plus 25-30 kg of fine soil, mix well and then apply in strips along the rows, or use 4 kg of 3% phoxim granules mixed with fine sand and apply in strips to control underground pests.

(2) Use 1 kg of 50% triadimefon powder plus 5 kg of water to dress 60 kg of seed, or use 25% triadimefon at a dosage of 0.3% to dress seed, to control smut and take-all disease.

2. Seedling stage: mainly to control corn aphids, stem-boring owlet moths, whorl maggots and zinc deficiency.

(1) Spray with 2000-3000 times dilution of 40% dimethoate emulsifiable concentrate or 40% omethoate emulsifiable concentrate to control corn aphids and also small brown planthoppers.

(2) In plots where stem-boring owlet moths and whorl maggots occur locally, drench the roots with 500 times dilution of 40% dimethoate emulsifiable concentrate, or 300 times dilution of 90% trichlorfon, or 400 times dilution of 50% dichlorvos. 2.2.4 Spray 25-30 kg of 0.2%-0.3% zinc sulfate solution per mu on the leaves at the 3-5 leaf stage to control zinc deficiency and enhance the disease resistance of the plants.

3. Whorl stage and ear stage: mainly to control corn borers, armyworms, sheath blight and leaf spot, and also to control striped stem borers, corn aphids and thrips.

(1) At the large trumpet stage, use Shamingling No. 1 granules or 105 granules, or 0.3% phoxim granules to control corn borers.

(2) Spray with 1000 times dilution of 90% trichlorfon, or 2000 times dilution of 50% dichlorvos, or 1000-2000 times dilution of 50% phoxim emulsifiable concentrate, or 1500 times dilution of 40% dimethoate emulsifiable concentrate to control armyworms.

(3) Spray with 500-800 times dilution of 70% thiophanate-methyl or 50% carbendazim wettable powder to control sheath blight and leaf spot. Alternatively, use 400-500 times dilution of 70% mancozeb wettable powder to spray the diseased parts or smear the stems to control sheath blight.

4. Grain-filling and maturity stage: mainly to prevent bacterial wilt, take-all disease and premature senescence. This is mainly prevented through agricultural cultivation measures such as selecting varieties with strong stress resistance, ensuring the nutritional area of a single plant, strengthening field management, and improving the ventilation and light transmission conditions of the corn population.