What is the best time to spray corn with the three rounds of pesticide?

If you want high yields when growing corn, you need to spray three rounds of pesticide. Some growers still do not know when to spray corn with the three rounds of pesticide. Let us take a look below at the best spraying time for the three rounds on corn.

1. First round of pesticide

Spray the cornfield herbicide well. The best period for post-emergence herbicide on corn is the 3 to 5 leaf stage of corn and the 2 to 4 leaf stage of weeds. This is the safest period and the one with the best weed control effect. Beyond this range, for large weeds and small old weeds, when spraying you must give the weeds a bath, use directed spraying, avoid the corn whorl, and also avoid the high temperatures at noon to reduce the occurrence of herbicide damage. While controlling weeds, you must also control planthoppers and thrips, prevent the occurrence of corn rough dwarf disease, and also kill insect eggs.

2. Second round of pesticide

Control insects, prevent disease, and prevent drought and waterlogging. 7 days after spraying the herbicide, you must control armyworms and stem borers on corn. The insects on corn now have developed resistance, and ordinary beta-cypermethrin and emamectin benzoate can no longer kill them. You must first choose high-end insecticides for control. Chlorfenapyr can be used for control, treating both insects and mites, with a residual effect of about 20 days.

While controlling pests, you must add brassinolide and use it together with a functional foliar fertilizer. This can repair the yellow seedlings and weak seedlings caused by herbicide damage, and can also repair weak seedlings caused by heavy rain, accelerating the growth of corn. It plays a key role in resisting drought, resisting waterlogging, and promoting strong seedlings.

Prevent the occurrence of top rot. Corn that insects have fed on is very likely to be infected with pathogens through the wounds, so use it together with a fungicide.

3. Third round of pesticide

Control excessive growth, prevent disease, and increase yield. The 8 leaf stage of corn is the best period for growth control. Growth control to prevent lodging is crucial. While controlling growth, combine insecticides, fungicides, brassinolide, and functional foliar fertilizer to prevent disease, kill insects, and increase yield all at once. If conditions permit, you can spray pollination essence liquid at the 10 leaf stage of corn, which plays an important role in poor pollination caused by high temperature heat damage, missing grains, and not-full grains.

The spraying times for the three rounds of pesticide on corn are the ones above. It is best to spray during these time periods, and the effect will be better.