The occurrence regularity of Robinia pseudoacacia seed wasps?
The occurrence rule of Robinia pseudoacacia seed wasps is as follows: two generations a year, the second generation larvae overwinter in the seeds, the overwintering generation larvae begin to pupate in the first and middle of May, adults appear and lay eggs in the middle and late days. The second generation larvae appeared from late May to early June, the first generation larvae began to pupate in mid-June, the first generation adults appeared from late June to early July, and the second generation larvae appeared from late June to mid-July and overwintered in the seeds. The occurrence time of each generation varies with climatic conditions, but it is consistent with the seed formation period of Robinia pseudoacacia.
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Seed breeding of Robinia pseudoacacia
Robinia pseudoacacia is a pioneer tree species in barren mountain afforestation, which has the characteristics of barren tolerance, drought tolerance, fast growth rate, wide use and so on. 1. Nursery land selection and seedling preparation should choose flat topography, good drainage, deep soil layer, fertile neutral sandy loam, and land with irrigation conditions. Vegetable plots should not be selected, and continuous cropping should not be selected. After the nursery land is selected, ploughing will be carried out in autumn with a depth of about 30 cm. Rake fine rakes in early spring and apply 5000 kilograms of rotten barnyard manure per mu. The poisonous soil made from phoxim EC should be applied during soil preparation to control underground pests.
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What are the characteristics of Xiaofeng of Robinia pseudoacacia seeds? What is the method of prevention and control?
Robinia pseudoacacia seed wasps mainly harm Robinia pseudoacacia. The larvae feed on the seeds in the pods. Adult, about 3 mm long, black, yellowish brown antennae, raised chest, transparent wings, short thorns in cloth, simple wing veins, yellowish. Ovate, fusiform, with long slender stalks at one end. Larva, the last instar body is about 4 mm long, milky white, the head is inconspicuous, the upper jaw is brown, the body is curved. Robinia pseudoacacia seed wasps produce two generations a year. Overwintering as larvae in seeds. In the coming year, it usually pupates from April to May, and adults appear and lay eggs after the first and middle of May.
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