The damage and prevention of the rootworm on jujube

Insects and rootworms. Larva borer damages adult trunks, bases, and main roots, destroys nutrient and water transport of the tree body, resulting in declining tree vigor. In severe cases, all branches and leaves become yellow and die, harming citrus fruits, peaches, pears, apples, dates, and other fruit trees. . In recent years, southern jujube trees have been seriously damaged, which directly affects the production and development of jujube. The law of occurrence usually takes 1 year in 1 year, and the larvae live in the base of the trunk or in the main root during winters from November to December. In the last ten days of April last year, the larvae emerged. The adult worms emerged from May to June, and the ovipositors spawned. At the latest by the end of July, The end of May to mid-June is the peak of spawning. A female lays more than 70 eggs and the oviposition period is about 1 month. The egg period is 9 to 14 days, the larval period is 9 to 10 months, and the flood period is 20 to 30 days. Prevention and control methods to strengthen the cultivation and management, so that jujube trees grow robust and reasonable load. Winter planed tree trays, digging tree pits. Around the diameter of the jujube tree planer 80 to 100 cm, depth of 30 cm round pit, on the one hand cut off the shallow roots and sprouting seedlings around the tree. Winter cold freezing shallow cortex larvae. When a large number of adult larvae emerged, they used nocturnal habitat characteristics to kill adult worms. The jujube tree base was inspected from June to August, and it was discovered that the eggs were quickly scraped with a knife. In the initial stage of larvae, soil excrement should be promptly checked to eliminate the initial sub-stage of larvae. The larvae damage department can also use a knife or a steel cone to kill, or use 80% dichlorvos, 25% cypermethrin 10 times liquid, absorb with absorbent cotton, and stuff it into the borehole. The application should choose the newest dung from the body. Hole, then close the hole with mud. In order to achieve the best control effect.


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