How to treat poplar pests?
Recently, our poplars have been pest-infested and the leaves are about to be eaten. How can we prevent it? Answer: There are mainly the following poplar leaf insect pests: 1. Liuxue Moth: It mainly harms Yang and Liuke trees. When the damage is serious, the leaves can be eaten, and there is a large amount of defecation, which seriously affects the environmental sanitation of the urban garden green space. (2) C. sinensis moth: larval colony, 1-2 years old often leaves leafy meat on a leaf, after 2 years of age, silky leaves concealed during the hiding period, in the event of shock can droop drooping with the wind, 3 years later gradually outward Diffusion hazards, the old mature silkworm leaves for thin phlegm. Because larvae breed quickly, have a large number, and are widely distributed, they can easily become disasters when they occur. 3, Yang Xiao Zhou moth: larvae leaves, epidermis, leaves, leaving only veins, was screen-like. In severe cases, most of the leaves of poplar and willow were eaten and looked far away. Control methods: 1, biological control. Bt and virus control were applied before the third instar larvae. The ground spray tree height is less than 12 meters in the middle young forest, and the dosage of Bt200 billion international units per mus of avermectin 6000-8000 times liquid. Release of Trichogramma dendrolimi, that is, 3-4 bee-drops per acre and 3-5 thousand bee-bees were released at the initial stage of the insects' spawning. 2, chemical control. Severe and difficult to spray the tall tree body hole injection drug prevention. Use a hole injection machine to drill 3-4 holes in different directions at the diameter of the tree, and inject 40% omethoate EC or 25% insecticide bis-reductant. The dosage is 2 to 4 ml of original drug or 1 fold dilution per 10 cm DBH. After injection, pay attention to use mud to seal the injection port. Using insect pests, use 10 ml of 2.5% deltamethrin, 10 ml of omethoate and 11 kg of waste oil to apply 3-5 cm wide closed loops on the trunk; 2.5% deltamethrin and waste diesel 1 : 10 mix, soaked in paper ropes made from packaging, and tied for 2 weeks at the diameter of the breasts of the poplars, with good results. In the larval stage spray 15% diflubenzuron aerosol (control agent and solvent mixture ratio is 1:1, dosage is 1.2kg/hm2) or spray 20% diflubenzuron III, 25 grams per mu, 1.2% smoke Alkaloid EC 1000-2000 times. 3, manual control. During the winter (Summer) period, artificially collecting underground deciduous or ploughing the soil to reduce the number of overwintering lice, the adult eclosion period is culled with black light to reduce the population density of the next generation. Organize humans to remove insects and egg masses. After using larvae to frighten the habit of pendulous drooping, the shake trunk kills the fallen larvae. For adult insects such as ulurus, they need to crawl on the tree to lay eggs. Before the adult eclosion occurs, plastic rags are placed on the trunk to prevent adults from laying eggs. Neckbandhearing Aid,Neckband Hearing Headphones,Neckband Hearing Headsets Neckbandhearing Aid,Neckband Hearing Headphones,Neckband Hearing Headsets Shenzhen Sunshine Technology Co.,Ltd , https://www.shenzhenyatwin.com