The occurrence regularity of Robinia pseudoacacia.
The occurrence regularity of Exoplecta pseudoacacia: it has 4 generations a year and overwinters as pupae in topsoil. The egg stage is about 15 days, the larva stage is about 25 days, the pupae begin to enter the soil in early May, the pupae stage is about 10 days, the first generation adults emerge, and the adult life span is about 5 days. The second generation adults appeared in the first and middle of July. The third generation adults appeared in the middle and late August, and the last generation larvae harmed until the middle of September. After maturity, they entered the soil to pupate and overwinter. The eggs are laid in the thick skin slits below 2 meters at the base of the trunk, piled up into blocks, covered with gray hairs. The newly hatched larvae migrate along the trunk and branches to the leaves, nibbling on the mesophyll and leaving the epidermis. With the growth of instars, the amount of nibble is large, the damaged leaves are notched or hole-shaped, the larvae are frightened, the silk droop is transferred with the wind, and the branches and leaves are net-like when the silk is damaged. Adults have phototaxis.
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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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What are the characteristics of Robinia pseudoacacia?
Black locust diamondback moth, also known as bean diamondback moth. It is mainly harmful to Robinia pseudoacacia, soybeans, vines and so on. The larvae feed on the leaves, and in serious cases, the leaves can be eaten up. The adult worm has a body length of 40mm to 50mm, a wingspan of 100mm to 120mm, yellow-brown body wings, dark purple of the head and forechest dorsal plate, a pale white semicircular spot near the center of the forewing, six wavy stripes on the wing surface, and a dark brown twill on the top of the wing to divide the top angle into two parts; the rear wing is dark brown and dark brown in the middle. Egg, oval, yellow and white. Larva, the last instar is about 80 mm.
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