1. Luring moths with light is a better way to prevent problems before they occur.
2. Mix carbofuran with chemical fertilizer and apply it deeply into the soil. The active ingredients of the pesticide can reach the leaves and have a control effect.
3. Once leaf-eating pests appear, using aerosols is also a method.
Four ways to control poplar leaf-eating pests are also provided for your reference:
1. Physical control During the winter or summer period of pests, strengthen the control of pupae and adults. Manually collect underground leaves or plow the soil to reduce the number of overwintering pupae. During the peak emergence stage of adults, insecticidal lamps (black light lamps) should be used to trap and kill them. According to the characteristics of most species of first-instar larvae clustering together with buds, organizing manual labor to remove buds and egg masses can kill a large number of larvae. You can also take advantage of the larvae's habit of spinning silk and drooping after being frightened, and vibrate the tree trunk to capture the falling larvae. For insect pests such as inchworms whose adults need to crawl up trees to lay eggs, plastic films, etc., can be tied to the trunk before the adults emerge to prevent the adults from climbing trees to lay eggs.
2. In patch forests and coastal defense forests, release Trichogramma during the egg stage of pests for control. To release the pine caterpillar Trichogramma, 50 bee release points will be set up per hectare during the early stages of the insect's egg laying, and the number of bees released will be 250,000 to 1.5 million.
3. To prevent and treat tall trees with punching medicine, use a punching and injection machine to drill 3 to 4 holes in different directions at the diameter of the tree, and inject 40% omethoate emulsifiable concentrate, 40% Monocrotophos emulsifiable concentrate, 25% insecticidal aqueous solution or double dilution. The dosage is 2 to 4 ml for 10 cm breast diameter. After injecting, seal the injection port.
4. Prevention and control of poisonous rings and poisonous ropes. For pests with high and low trunks and the habit of climbing trees after overwintering, pesticides can be applied to the trunks or tied with poisonous ropes. Before pests get on the tree, mix 10 ml each of 2.5 deltamethrin and omethoate, add 1 kg of waste engine oil, and apply a 3 to 5 cm wide closed ring on the trunk; or use 2.5% cyanide bromide. Mix pyrethrum ester and waste diesel oil at a ratio of 1:10, soak and pack paper rope to make a toxic rope, and tie it at the diameter of the tree for 2 weeks.