Poplar moth is an important pest that harms poplars. It mainly eats leaves. It takes a few days to eat up the leaves, seriously affecting the growth of trees, and there are many kinds of common moths that harm poplars. The species of the river basin are the flat moth, brown thorn moth, yellow thorn moth, and green thorn moth. The forest farmer often refers to the larvae of moth moth as "Omo spicy" and "Spicy star anise". In addition to endangering poplars, it also harms apple trees, pears, peaches, alfalfa, saplings, paulownia, and indus and many other fruit trees and forests. The identification and prevention and control methods of poplars are described as follows:
Morphological characteristics
The length of female adult moths is 13 mm to 18 mm, and the length of the wings is 28 mm to 35 mm. The length of adult males is 10 mm to 15 mm, and the length of wings is 30 mm. The adult body is dark gray-brown, with darker ventral surface and foot color, grayish-brown spots on the forewings, more obvious male moths, and dark grayish brown wings. The egg is oval in shape, flat and smooth, about 1 mm long, light yellow at the beginning, and grayish brown afterwards. The mature larvae are 21-26 mm in length and 16 mm in width. They are oval in shape, slightly raised on the back and resemble a turtle back. They are green or yellow-green and have a white topline. There are 10 knobs on both sides of the worm body. hair. Tendons are 10 mm to 15 mm long. The front end is more fat, nearly elliptical, initially milky white, yellow-brown when nearing hatching, pods elliptical, 12 mm to 16 mm long, dark brown, its knots around the roots of poplars Topsoil.
Prevention measures
1. Combine fertilization, pruning, excavation or cutting out the clam shells and earthworms on the trunk. During winter ploughing, the understory deciduous and topsoil are buried in the bottom of the fertilizing trench, or in combination with the soil to prevent freezing, soil is cultivated in the base of the trunk within 30 centimeters and the pressure is about 10 centimeters. Year base.
2. Artificially remove insects. The young larvae of the flat moth are mostly clustered on the leaf blade. After the leaves of the larvae, the white-film shape is obvious. The leaves of a large number of larvae can be removed and concentrated to eliminate a large number of leaf-feeding larvae.
3. Light trapping. In the adult moth stage, using its phototaxis, black lights or vibration-type moth trap lights can be set up in poplar groves and nurseries to trap and kill a large number of adults of the moth, reducing the amount of occurrence, and the effect is very good.
4. Chemical control. During the larval stage, 90% crystal trichlorfon, or 1000 to 2000 times malathion, or 80% dichlorvos emulsifiable concentrate and 50% phoxim emulsifiable concentrate 1500 to 2000 times can be sprayed. The use of biological pesticides such as acaricidal bacillus and white-stiffened seedlings for prevention and control of 1000 to 1500 times is economical and effective, and does not cause environmental pollution. It is advocated for use in parks and street trees. Because poplars are relatively tall, long canopies are used to spray canopies.
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