The main pests are corn borers and aphids. Look at the picture should be aphids. Corn borer can cause corn foliage, drilling stalks, endangering female and male ears. Corn borer control should be mastered at the end of the heart leaves, using the "three fingers and a handful" method, with 1.5% phoxim granules at 1.5-2 kg per mu dosage to throw the heart, the prevention and control effect is obvious. Also available pyrethroid pesticides in water 1000 times liquid or 50% phoxim emulsion 1000 times liquid, remove the nozzle of the sprayer, the liquid will be sprayed into the heart of the leaf clusters. For aphids, male pumping and male cutting can reduce its damage to some extent, can also be used to 40% Lekomat emulsion or 10% imidacloprid 1000 times liquid spray control