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What are the characteristics of black locust aphid? What is the method of prevention and control?

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Robinia pseudoacacia aphid harms many kinds of legumes, such as Robinia pseudoacacia, locust tree, Amorpha fruticosa and so on. As an adult. The new shoots of Robinia pseudoacacia are clustered by nymphs to suck sap, which causes the new shoots to bend, the young leaves curl, the branches can not grow, and its secretions often cause coal fouling disease. The wingless aphid is about 2 mm long, oval, black and glossy, with obvious hexagonal reticulation on the back of the head, chest and abdominal segments 1-6; horizontal striations on the abdominal segments 7 and 8; winged aphids, long ovoid, black and smooth, wings gray-white, transparent. Robinia pseudoacacia aphids occur for more than 20 generations a year. Mainly with

Robinia pseudoacacia aphid harms many kinds of legumes, such as Robinia pseudoacacia, locust tree, Amorpha fruticosa and so on. As an adult. The new shoots of Robinia pseudoacacia are clustered by nymphs to suck sap, which causes the new shoots to bend, the young leaves curl, the branches can not grow, and its secretions often cause coal fouling disease. The wingless aphid is about 2 mm long, oval, black and glossy, with obvious hexagonal reticulation on the back of the head, chest and abdominal segments 1-6; horizontal striations on the abdominal segments 7 and 8; winged aphids, long ovoid, black and smooth, wings gray-white, transparent.

Robinia pseudoacacia aphids occur for more than 20 generations a year. Wingless parthenogenetic aphids and nymphs overwinter at the junction of heart leaves and rhizomes of leeward and sunny places, wild alfalfa, wild peas and so on. The winged parthenogenetic aphids were produced on overwintering hosts in March next year, and migrated to leguminous plants such as spring peas and Robinia pseudoacacia, forming the first migration and diffusion peak at the end of May and the beginning of June. the population density of Robinia pseudoacacia increased gradually in early June, and the proliferation accelerated in the middle and late June, forming the third migration peak. In the rainy season and high temperature season in mid and late July, except for the peak of Robinia pseudoacacia and secondary migration in the shade, and the harm of continued reproduction of aphids on Amorpha, the population density decreased obviously. In October, it propagated on new buds such as lentils, kidney beans and Amorpha after harvest, and then gradually produced winged aphids and migrated to overwintering hosts to breed, harm and overwintering.

Prevention and control methods. During the period when aphids are harmful, 40% dimethoate EC or 25% parathion EC and 50% malathion EC 1000 × 200O can be sprayed; or 50% monocrotophos EC or 40% omethoate EC 5 × 10 times can be injected into the base of the tree trunk, or scrape off the old bark around the trunk and apply a ring 5cm wide with this depth.

 
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