When is corn sprayed with pesticides?

Insect pests will seriously affect the growth of corn, corn insecticides can effectively and safely control all kinds of insect pests. So when does the corn get insecticide?

I. sowing date

Mainly to control underground pests and seed-borne diseases.

1. Implement crop rotation to avoid continuous cropping. Clean the countryside and reduce the source of primary infection. The varieties with strong stress resistance were selected.

two。 Use seed coating or mix well with 50% phoxim EC 200-250 g and fine soil 25-30 kg per mu, then apply along the ridge, or use 3% phoxim granule 4 kg to mix fine sand and apply strip to control underground pests.

3. Seed dressing 60 kg with 50% trimethoprim powder 1 kg plus 5 kg water, or 0.3% with 25% triadimefon powder to control smut and total erosion.

II. Seedling stage

Mainly to control corn aphid, stem borer, spiralis, zinc deficiency.

1. Combined with inter-fixed seedlings, pull out weeds in the field, burn weeds and diseased plants in time, and reduce the source of insects. Strengthen the management of water and fertilizer to promote the early emergence of seedlings.

two。 Spray 40% dimethoate EC or 40% omethoate EC 2000-3000 times to control corn aphid and gray planthopper.

3. In the land with local stem borer and spiralis, the roots were irrigated with 40% dimethoate EC 500 times or 90% trichlorfon 300 times or 50% dichlorvos 400 times. 2.2.4 per mu use 0.2% Mel 0.3% zinc sulfate solution 25-30kg in slits? Foliar spray at-5 leaf stage can prevent and cure zinc deficiency and enhance plant disease resistance.

III. Heart leaf stage and panicle stage

Mainly to control corn borer, armyworm, sheath blight and leaf spot, as well as stripe borer, corn aphid and thrips.

1. Strengthen field management, timely ploughing and weeding, rational fertilization, and increase the application of phosphorus and potassium fertilizer, so as to improve the stress resistance of plants.

two。 Shaminling 1 granules or 1% 1605 granules and 0.3% phoxim granules were used to control corn borer during the big trumpet period.

3. Spray 1000 times of 90% trichlorfon or 2000 times of 50% dichlorvos, 1000-2000 times of phoxim EC and 1500 times of 40% dimethoate EC to control armyworm.

4. Spray 70% methyl topiramate or 50% carbendazim wettable powder 500-800 times to control sheath blight and leaf spot, and 400-500 times 70% mancozeb wettable powder can be used to spray or smear stems to control sheath blight.

Fourth, filling maturity period

In order to prevent the occurrence of bacterial wilt, total erosion and premature senility. It is mainly prevented by agricultural cultivation measures such as selecting varieties with strong stress resistance, ensuring the nutritional area per plant, strengthening field management, improving the ventilation and light transmission conditions of maize populations, and so on.

In different periods of corn, the diseases and insect pests that need to be controlled are different, so the insecticides sprayed are also different, which should be chosen according to the actual situation.