What about poplar worms?

There are many kinds of diseases in poplar, and the damage is serious. The main pests are Plutella xylostella, Plutella xylostella and so on. So, what about poplar worms?

1. What about poplar worms?

1. Manual hunting. According to the scars or grooves that the adults bite when laying eggs, stab or smash the eggs with a knife or hammer, hook out the larvae with wire, catch the adults, and so on.

2. Biological control. The use of velvet beetle, Sichuan hard skin swollen leg wasp, woodpecker and so on for prevention and control.

3. Chemical control. Green Weilei was used to control adult longicorn beetles. 200-300 times of green Weilei solution was sprayed on tree trunks or large lateral branches before the peak of adult emergence.

4. Prevention and treatment of trunk drilling and drug injection. For the trees with high crown and difficult spray control, injection of 40% omethoate and 20% imidacloprid into the trunk can control longicorn beetle adults and larvae. The method is to drill the oblique hole up to the xylem at the 30cm of the trunk from the ground, and the dosage is generally 0.3-0.9mL/cm DBH. It can also be injected directly from the defecation hole.

2. Types of diseases of poplar leaf-eating insects

1. Plutella xylostella: the larvae live in groups, and the 1st-2nd instar often peels off the mesophyll on a leaf, and after the 2nd instar, it can spin silk and drift with the wind, gradually spread the harm outward after the 3rd instar, and make thin cocoon pupation when it is ripe. Due to the rapid reproduction, large number and wide distribution of larvae, it is very easy to cause disasters when they occur.

2. Yang Xiaozhou moth: the larvae feed on the epidermis and mesophyll of leaves, leaving only leaf veins, showing a sieve-like shape. In serious cases, most of the leaves of poplars and willows are eaten up.

3. Spodoptera litura: it mainly harms poplar and willow trees. When the harm is serious, the leaves can be eaten up, and there are a lot of defecation, which seriously affect the environmental sanitation of urban garden and green space. Salix moth has 2-3 generations a year, and the 2nd instar larvae overwinter as thin cocoons at the cracks in the bark, and the activity begins to harm in the first and middle April of the following year. June is the peak period of the first generation larvae and September is the peak period of the second generation larvae.