Peanut meal

The scientific name Aphis medicaginis Koch. is Homoptera, Amaranthidae. Synonyms A.craccivora (Koch). Alias ​​苜蓿蚜, soybean meal, 槐蚜. Distributed throughout the country. Shandong, Henan and Hebei suffered heavy damage.

Host peanuts, wolfberry, wolfberry fruit, peas, cowpea and so on.

Injury characteristics, nymphs clustered on the peanut leaves, buds, flower stalks, fruit juice sucking, caused by yellowing leaves curling, slow growth or stop, plant dwarf, affecting flower bud formation and capsule development, resulting in reduced peanut production.

The morphological characteristics of the winged females are 1.5 to 1.8 mm in length and are dark green and shiny. Antennae 6 knots, Sections 1 and 2 dark brown, Sections 3 and 6 yellow-white, brown between festivals, Section 3 longer, there are 4-7 sense circles, arranged in rows. The wing base, wings, and veins are all orange-yellow. The leg joints, the ends of the temporomandibular joints, and the tarsal knots are dark black and yellow and white. The back of each section of the abdomen had hardened dark brown streaks, and each of the lth and 7th had 1 pair of ventral processes. The ventral tube is black, cylindrical, with slightly thinner ends, and has an imbricate pattern. It is twice as long as the tail piece. The tail papillae are black upturned with 3 bristles on each side. The wingless females have a body length of 1.8-2.0mm, body is obese, black to purple, and shiny. Eggs are oval in shape, light yellow at the beginning, and grassy green to black afterwards. If the tan is brownish, it has a thin wax powder on the body, the belly tube is black and slender, and the tail piece black is very short.


Living habits Shandong, Hebei, 20th generation, Guangdong, Fujian more than 30 generations. In winter in Shandong, where there are no wings, if they live in shelters, such as leeks, oysters, and diptera, they are wintering, and there is also a small amount of eggs that survive winter on the stubble plants of the dead host. The locusts continue to reproduce on legumes in southern China without wintering. The northern part began to move when the temperature in Hunchun returned to 10°C, and it was due to breeding in mid-March. After breeding on the wintering hosts for several generations, they began to produce winged plagues and migrated to nearby peas, hedgehogs, and other plants of the country. After the emergence of the peanuts, they moved into the peanut field. The period from the end of May to the end of June in the peanut flowering and podging period is the culmination of the locust infestation. Peanuts produce winged pre-harvest crops, migrate to summer summer legumes, fall seedlings and then migrate into peanut fields after the emergence of seedlings, until the late autumn produce winged copulation spawning overwintering. The warm climate in late spring and early summer is favorable for the occurrence and reproduction of this worm. Dry lands, sloping fields and densely growing land masses occur. The main natural enemies include ladybugs, fly aphids and grasshoppers.

Prevention methods (1) Spray 20% of imidacloprid wettable powder or 50% of anti-inflamy wettable powder 2500 times, 50% of phoxim EC 1500 times after 2 or 3 days after peak migration of winged pods to peanut field. , 40% Dimethoate EC or 80% Dichlorvos EC 1000-1500 times, 70% Dioximenet WP 2000 times, 40% Acephamide EC 1500 times. (2) Spray 1.5% dimethoate powder per 667m 2 2kg or 2.5% trichlorfon powder, 2% killer pine powder, 1.5 to 2kg per 667m2.

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