What Pesticides Should Be Used on Corn? A Detailed Guide to Scientific Application Methods
During the growth process of corn, spraying pesticides is inevitable, but some growers still do not quite understand what pesticides to use on corn and when to spray them. Let us take a look together below.
1. Herbicides
To apply corn field herbicides well, the optimal period for post-emergence corn herbicides is the 3- to 5-leaf stage of corn and the 2- to 4-leaf stage of weeds. This is the safest period with the best weed control effect. Beyond this range, for large weeds and small old weeds, spraying must give the weeds a bath, with directed spraying, avoiding the corn whorl, while also avoiding high temperatures at noon to reduce the occurrence of pesticide damage. While controlling weeds, it is essential to also control planthoppers and thrips, prevent the occurrence of corn rough dwarf disease, and also kill insect eggs.
2. Insecticides
7 days after applying herbicides, it is essential to control armyworms and stem borers on corn. Insects on corn have now developed resistance, and ordinary beta-cypermethrin and emamectin benzoate can no longer kill them. High-end insecticides must be selected first for control. Chlorfenapyr can be used for control, treating both mites and insects, with a residual effect period of about 20 days.
While controlling pests, it is essential to add brassinolide and use it together with functional foliar fertilizer. This can repair yellow seedlings and weak seedlings caused by herbicide damage, and can also repair weak seedlings caused by heavy rain, accelerating corn growth. It plays a key role in drought resistance, waterlogging resistance, and promoting strong seedlings.
3. Foliar Fertilizer
The 8-leaf stage of corn is the optimal period for growth control. Growth control and lodging prevention are very critical. While controlling growth, combine insecticides, fungicides, brassinolide, and functional foliar fertilizer to complete disease prevention, pest control, and yield increase all at once. If conditions permit, pollination essence liquid can be sprayed at the 10-leaf stage of corn, which plays an important role in poor pollination caused by high-temperature heat damage, as well as missing grains and unfilled kernels.
The use of pesticides on corn should be determined according to the actual growth situation. According to the specific growth situation, treating the symptoms with the right remedy is the best choice.