Soybean aphids are also known as putrid insects and honey insects. It is an important pest on soybeans. Both nymphs and adults suck sap with sucker-type needles. Soybean shoots, stems, leaves and young pods can be affected. The growth of the affected plants was inhibited, the plants were dwarf, the stems and leaves were curled, the knots were scarce, and the grain quality was poor.
Occurrence conditions: The occurrence period of soybean aphids is closely related to climatic conditions. Mainly in two stages, one is spring in the hatching of overwintering eggs, such as abundant rainfall, vigorous growth of rat buckthorn, good nutritional conditions, it is conducive to the survival of pups and adult pupal breeding. Second, in the early stage of the pre-harvest period of soybean pods in the field, if the average temperature reaches 22°C, and the average relative humidity in the ten days is below 78%, the long-term high temperature and drought are extremely conducive to the reproduction of soybean pods and cause serious damage during the flowering period. Natural enemies have a greater impact on the suppression of aphids. For example, there are a large number of natural enemies such as field grasshoppers, ladybugs, and flies, which can control the occurrence of soybean meal.
Control indicators:
(1) 5 to 10% of plants roll when they occur
(2) There are more than 50% of alfalfa strains, and 100-plants have more than 1500 to 3,000 heads.
Control methods:
70% imidacloprid water dispersible granules 15-20 g/ha (or 35% imidacloprid suspension 45-80 g/ha) + 2.5% cyfluthrin EC 225 ml/hectare (2.5% high efficiency deltamethrin EC 225 ml/ Hectare)
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