Corn aphid damage How to control corn aphids

Today I will introduce to you the characteristics and prevention methods of corn aphids:

What do two corn pests, aphids and spider mites, have in common?

Expert: Aphids and spider mites are piercing-sucking pests. Corn aphids are commonly known as sticky insects. They belong to the order Homoptera and the family Aphididae. Their host crops include corn, sorghum, wheat, and foxtail grass. Their morphological characteristics are: the eggs are oval. There are two types: winged parthenogenetic aphids and wingless parthenogenetic aphids. The body length is about 1.6-2mm. The antennae have 4-6 segments, and the epidermis is smooth and has patterns. Winged aphids usually have 6 antennae, the midrib of the forewings is divided into 2-3 branches, and the hindwings often have 2 elbow veins.

It is mainly distributed in Northeast China, North China, East China, Central China and Southwest China, directly affecting the photosynthesis and pollination of corn, and can spread viruses, causing corn dwarf mosaic disease, which can reduce corn production by 15-30%. In my country, the main pests that harm corn are corn aphids, cereal aphids, wheat aphids, and wheat aphids. In addition, there are cotton aphids in the Huanghuaihai area, with corn aphids being the most serious.

Corn aphid infestation can lead to significant yield losses

Experts: Adults and nymphs gather on the back of leaves, heart leaves, filaments and tassels to feed, can secrete "honeydew" and often form black mold on the affected parts, affecting photosynthesis and turning the edges of leaves yellow; if they occur on tassels, they will affect pollination and lead to reduced yields; the ears of severely affected plants are thin, the grains are not full, and the bald tips are long. In addition, aphids can also spread corn dwarf mosaic virus and red leaf virus, leading to greater yield losses caused by viral diseases.

How to Control Corn Aphids

Expert: Agricultural control. Remove weeds in the fields to reduce early insect sources.

Chemical control: Seed coating or seed dressing. Seed coating with 70% thiamethoxam (Ruisheng) seed dressing agent, or seed dressing with 10% imidacloprid wettable powder, is effective in controlling aphids in the seedling stage.

Use granules. In the heart leaf stage of corn, before aphids are in full bloom, use 3% phoxim granules 1.5-2 kg per mu and spread them on the heart leaves, or 15% chlorpyrifos granules 300-500 g/mu, mix with fine sand in a ratio of 1:30-40 and spread evenly on the heart leaves, which can also control corn borers.

Spray control. The seedling stage and the early stage of tasseling are the key periods for controlling corn aphids. If aphids are found to be numerous, spray with 10% imidacloprid wettable powder 1000 times diluted, 10% cypermethrin emulsifiable concentrate 2000 times diluted, 2.5% trifluthrin 2500 times diluted, 50% cypermethrin wettable powder 2000 times diluted, 25% thiamethoxam water dispersible concentrate 6000 times diluted, etc.