Mangosteen mosquitoes are a common pest and disease on mango trees, affecting the photosynthesis efficiency of leaves, which naturally leads to the growth of fruit trees. A brief introduction to this issue by the China Pesticide Network Xiaobian:
1. Morphological characteristics of mango leafhoppers Erosomyiamangiferae Felt is a Diptera insectivorous insect. The adult grass is yellow and has a body length of about 1-1.2 mm. The egg is approximately elliptical and is about 1 mm long and colorless. The larvae resemble aphids and yellows. The last instar larvae are about 2 mm long and 0.6 mm wide. The body segments are obvious and the sword bones are slender. It has a short oval shape and a yellow color. The squat is 1.4 mm long and has a yellow-brown film capsule on the outside.
2. The pathogenesis of mango leaf mites This worm is distributed in Guangdong, Guangxi, Hainan, Yunnan, Fujian and other producing areas, and is a frequently occurring important pest. The worm is seriously damaged in the shoot stage, and there may be several or a dozen worms per leaf, which has a great influence on the quality of the new shoots. The damaged leaves leave a large number of perforations, which affects the photosynthesis efficiency of the leaves, resulting in poor growth of the canopy and affecting the tree potential. And production.
Occurrence law and habits The insects are about 8 generations a year. After mid-November, the larvae gradually grow over the winter at 3-5 cm in the topsoil, and emerged from the beginning and the end of April of the next year. The peak of the evening is 9-10, the next morning. The females disperse and lay eggs on the back of the young leaves. The females die on the 2-3rd day after spawning, and the males die on the next day or the third day after mating. After hatching, the larvae bite the young leaves and cut into the leaves to feed the mesophyll, causing the water to burn spots. As the larva grows, it forms small tumor-like worms. One leaf can have more than a dozen worms, and the damaged leaves are necrotic. After the larva leaves the worm, the center ruptures, causing perforation, and the severely damaged leaves have an irregular reticular rupture, and then the old larvae enter the topsoil.
3, mango leaf cockroach control method New shoots when the young leaves are extracted 3-5 cm, use 20% pyrethroid emulsifiable concentrate or 10% cypermethrin emulsifiable concentrate or 25% enemy emulsifiable concentrate 2000-3000 times liquid 40% dimethoate emulsifiable concentrate Add 90% insecticide trichlorfon crystal 600 times solution or 40% hirudin EC, 40.8% chlorpyrifos (Lesburn) emulsifiable oil 1000-1500 times liquid foliar spray, application interval 7-10 days, each Apply 2-3 times at the secondary stage, apply evenly, and spray the ground in the canopy drip line in spring.
Strengthen the management of fertilizer and water, and promote the tidying of the tips, which is conducive to the uniform spraying and treatment of insects.
Poisonous soil kills insects. Before the spring rain of 2-3 months in each year, it is recommended to use 3% iso-phosphorus granules 4-5 kg ​​plus 20 kg of fine sand or mud powder per 666.7 square meters, evenly spread on the soil table within the canopy drip line, and then cover 2 cm thick mud powder can kill the larvae that enter the soil and the adults that will emerge from the soil in spring. At this time, the activity place is limited, the insect population density is low and the resistance is weak, and the concentration of the pesticides is better, and the effect period is about 60 days.
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