Poplar tree leaf pest control method

Due to the single tree species and abnormal climate, the poplar-feeding leaf pests, Yang Xiaoxing moth, Yangsaucus moth, Thornbill moth, Yang yellow leafhopper, Longhorned beetle, Geometridae moth, etc., often occur in large areas of pure poplar forests, especially in boats. Moth leaf-eating pests are extremely likely to be outbreaks, often eaten leaves in 3-5 days, seriously affecting the growth of trees.

The prevention and control of such pests must always be based on the principle of prevention, comprehensive management, implementation of prevention and treatment strategies for early and small governance, and comprehensive measures for biological measures. Priority is given to the use of biological pesticides (such as Bacillus thuringiensis, Beauveria bassiana, etc.), viruses, bionic preparations to reduce the population density of the population, and then to increase the population of natural enemies to achieve biological control of pest population density. For forests with particularly severe pests, large-scale outbreaks and disasters should be controlled by airplanes, and the ground should be timely controlled through chemical pesticides, such as drilling and injection. The fundamental measure is to timely clear insect pests, update tree species, and create mixed forests to improve their ecological conditions, enhance the growth of forest trees and the resistance of forest trees to insects.

First, artificial physical control

The overwintering (Summer) period is an advantageous opportunity for the use of artificial measures to prevent and control. As the poplar is tall, the prevention and control of cockroaches and adults will have a multiplier effect. Manual collection of deciduous or ploughed soil will reduce the number of overwintering cockroaches. The use of black light traps and other measures during the adult emergence period will help reduce the population density of the next generation. According to the characteristics of the first-instar larvae of most leaf-eating pests, the human worms and egg masses are organized to remove large numbers of larvae. It is also possible to use the larvae's habit of sagging after being frightened and to kill the fallen larvae by shaking the trunk. For adult insects that need to crawl on the tree to lay their eggs, adults can be trapped on the tree trunks by means of tying up plastic sheets in the trunk before adult emergence.

Second, Bt and other biological control

The larvae were sprayed with biological pesticides and virus control before the third instar period. The ground spray tree height is below 12 meters in young and middle-aged forests. The dosage is Bt200 billion international units per mus, the insecticide of 1-2 million spores per milliliter of chloroplasts, and avermectin 6000-8000 times. Tall forests, if there are airport conditions, can consider the use of aircraft control. It is also possible to release the Trichogramma dendrolimi, that is, in the early stage of the insects' spawning, 50 bees per hectare, and the amount of bees released is 25-1.5 million.

Third, bionic agent control

The use of diuretic-based bionic pesticide spray control. 20% diflubenzuron III 25 grams per acre, 1.2% cannabinoid EC 1000-2000 times. Bionic agent should pay attention to the use of medication time, the smaller the worm age, the better the rule.

Fourth, hole injection drug prevention

For tall trees that are severely sprayed and difficult to spray, they can be controlled by injection and injection. Drill 3-4 holes in different directions at the diameter of the tree using a hole-injection machine, and inject 40% omethoate EC, 50% methamidophos EC, 40% monocrotophos EC, and 25% dimethoate. Water agent and so on. Dosage is 2-4 millimeters per 10 centimeters of breast diameter, 1 dose of original drug or 1 time dilution. After injection, pay attention to sealing the injection port.

Fifth, poison ring and poison rope prevention

Pests that have the upper and lower trunks and the habits of the trees that pass through the winter can be controlled by the method of applying the chemicals to the trunk or tying the poison ropes. Before the larvae were planted on the tree, they were mixed with 10 ml of 2.5% deltamethrin + 10 ml of omethoate + 11 kg of waste oil, and a 3-5 cm wide closed loop was applied to the trunk. Mix 2.5% deltamethrin with waste diesel 1:10 and soak the packaging paper rope to form a poison rope. Two weeks of binding at the breast diameter at the poplar resulted in good results.

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