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. The following year usually pupates from April to May, adults appear and lay eggs in the first and middle of May, the first generation larvae hatch into the pod horn to feed on the harmful seeds in the middle of May, and the second generation larvae appear in the middle of June and eat the seeds in the pod horn to overwinter after autumn.
The occurrence period of the insect varies slightly from year to year, but it is consistent with the phenological phase of Robinia pseudoacacia, especially the pod horn formation stage. The adults lay eggs in the seeds, and yellow glue spots can be seen on the pod horn surface after spawning. After hatching, the larvae eat the cotyledons, and the damaged pod corners gradually change color and appear brown spots. The larvae did not transfer the damage, but only one seed was damaged in the whole life, and the surface of the damaged seed was lavender brown.
Prevention and control methods. Strengthen quarantine, strictly prohibit the spread of wormed seeds, and fumigate the seeds if necessary; soak the seeds in 80 ℃ warm water for 30 minutes before sowing to kill the larvae; a large area of forest trees can be fumigated with dichlorvos during the adult occurrence period; the pods with insects are thoroughly removed from the trees in winter to kill the overwintering larvae.
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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 due to climatic conditions, but it is similar to Robinia pseudoacacia seeds.
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Occurrence regularity of wheat moth in Robinia pseudoacacia seeds?
The occurrence rule of wheat moth in Robinia pseudoacacia seed is that there are two generations a year, and the larvae overwinter in the angle of the damaged pod. The adults emerged in the middle of June of the following year, and the eggs were laid on the edge of the pod horn. The newly hatched larvae often feed on the pod stalks of the damaged species in the dry sepals, then eat into the pods to harm the young seeds, and pupa in the pods after maturing. The pupa period is 7 days, and the adults continue to lay eggs and hatch after Eclosion. The second generation larvae endanger until autumn and overwinter with small gray-white cocoons in the pods.
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