The occurrence regularity of Robinia pseudoacacia valley moth?
The occurrence regularity of Robinia pseudoacacia valley moth: Shandong occurs for 2 years a year, overwintering with different instar larvae of the second generation in the trunk tunnel. It was harmful to active feeding in late March of the following year, and the peak period of Eclosion was in the middle of May. Most of the eggs lay in the wounds of the branches or in the cracks in the bark, and the first generation of larvae began to hatch in mid-June. The newly hatched larvae move lively and sneak into the subcutaneous phloem and cork cortex, showing a longitudinally irregular tunnel. The injured site proliferated and expanded, and the bark warped and cracked. The mature larvae began to pupate in the middle of July, the adults could be seen in the last ten days, the peak period of Eclosion was in the middle of August, the hatching period of the second generation eggs and larvae was from the first ten days of August to the middle of September, and the larvae overwintered one after another in late October.
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What are the characteristics of Robinia pseudoacacia valley moth? What is the method of prevention and control?
Robinia pseudoacacia valley moth is commonly known as Robinia pseudoacacia. It mainly harms Robinia pseudoacacia. When the larvae eat the trunk cortex, the tissue in the affected part is proliferated and expanded, the bark is warped and cracked, the skin is filled with rotten tissue, and the skin is sewn with insect dung, which can lead to the weakness of the tree and even the death of the whole plant. Adult, female moth 7 mm 10 mm long, wingspan 17 mm 22 mm, male moth slightly smaller; gray-white or black-brown body, gray-white chest and wing base; gray-white forewings mixed with grayish brown or dark-brown scales, wing base with erect dark-brown scale clusters, wing surface 2 horizontal scale clusters
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The method of accelerating budding and raising seedlings of Robinia pseudoacacia
Robinia pseudoacacia is resistant to drought, barren and growing fast, so it is a good tree species for greening and afforestation in rural areas. If the root segment budding method is used to raise seedlings, not only the cost is low, the operation is simple, but also the seedling quality is good. First, select the land to make the bed and choose the nursery land with leeward and sunny direction, flat terrain and good drainage and irrigation as the hotbed. Before making the border, 1000 kg of organic fertilizer, 50 kg of ammonium bicarbonate and 50 kg of calcium superphosphate were applied per mu. After ploughing and raking, 100 ∶ 1 wheat bran and methamidophos bait were sprinkled on the border surface to prevent mole cricket and other underground pests. The border faces from north to south, 1.5 meters wide and 12 meters long.
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