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. The larva, about 80 mm in length at the last instar, has a dark green body with yellow thorn-like particles, with 7 white twill stripes on the ventral side and no tail horn on the abdomen. Pupa, ca. 50 mm, long oval, reddish brown.
The black locust diamondback moth has one generation a year. The mature larvae were buried in the soil to survive the winter. In the following year, it pupated in late June, began to emerge into adults in early July, and reached its peak in the middle of July. Adults often lay eggs on the back of leaves. The egg period is 6-7 days. It hatched into larvae in late July, and the larval period was about 40 days. In September, the larvae matured and buried in the soil to survive the winter.
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The occurrence regularity of Robinia pseudoacacia.
The occurrence regularity of Robinia pseudoacacia: 4 generations a year, overwintering as pupae in topsoil. Eclosion began in early April of the following year, mating and oviposition, the egg period was 15 days, the larval stage was about 25 days, the pupation began in early May, the pupal stage was about 10 days, and the adult life span was about 5 days. The second generation of adults appeared in the first and middle of July. The third generation of adults appeared in the middle and late August, and the last generation of larvae harmed to the middle of September. After maturing, they were pupated and overwintered. The eggs lay in the thick skin seams below 2 meters from the base of the trunk, accumulated into blocks and covered with gray hairs. Newly hatched
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What is the occurrence regularity of Robinia pseudoacacia (Plutella xylostella)?
The occurrence regularity of Robinia pseudoacacia (Plutella xylostella): one generation a year occurs in Hebei, Shandong, Jiangsu, Anhui and other places, and the mature larvae drill into the soil 10 to 15 cm deep to overwinter. Pupation began in the first and middle June of the following year. The pupal stage ranges from 10 to 15 days. The adult Eclosion occurred in the first and middle of July, and the peak of emergence was in the middle of July. The adults lie still in the branches and leaves during the day and begin to move in the evening, and the adults have phototaxis. Generally, eggs begin to lay eggs 3 hours after mating, and the eggs are mostly laid on the back of the leaves and a few on the front. The average number of eggs laid by each female is about 350. Adults 7 to 10
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