The occurrence regularity of locust aphids?
The occurrence regularity of Robinia pseudoacacia aphids: more than 20 generations a year, overwintering with wingless solitary aphids, nymph aphids or a small number of eggs in the roots, stems and leaves of leguminous plants such as wild alfalfa, propagating on overwintering hosts in March and April the following year, and producing winged parthenogenetic aphids that migrate to Robinia pseudoacacia, locust trees and other leguminous plants in late April. It is harmful all the year round, especially in the early flowering stage of Robinia pseudoacacia, and the winged aphid migrates to its host in October and overwinters. The most suitable temperature for breeding aphids is 19 to 22 degrees Celsius, and the relative humidity is 65% to 70%. When the temperature is below 15 degrees Celsius or higher than 25 degrees Celsius, reproduction is restricted when the relative humidity is above 85%.
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What are the characteristics of black locust aphid? What is the method of prevention and control?
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
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Biological characteristics and control strategies of Exoplectria pseudoacacia
Acacia exocellata. It is distributed in Robinia pseudoacacia forest areas of Anyang, Puyang, Xinxiang, Kaifeng City and other ancient Yellow River channels in Henan Province. It mainly harms Robinia pseudoacacia. In large occurrence years, it can harm jujube trees and crops. This insect has gluttony and can eat all the leaves of pruning and whole trees in a short time. In high temperature and drought years, the leaves can be eaten up 2~3 times a year, causing the upper part of the tree to die, sprouting from the middle and lower parts of the trunk, causing serious harm to the growth of the tree. Prevention and control methods: (1) construction
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