The scientific name Sylepta derogata Fabricius belongs to the order Lepidoptera. Alias ​​cotton leafhoppers, cotton leaf roller leafworms, leaf worms, cotton wild moths, cotton leaves Ye Ye. Distribution in addition to Ningxia, Qinghai, Xinjiang has not been reported, other provinces have.
In addition to harming cotton, the host also harmed leeks, hollyhock, hollyhock, ramie, hibiscus, and kapok.
The larvae are rolled into a cylindrical shape, hiding in which the leaves become nicks or holes. Seriously eat all cotton leaves, continue to harm the cotton boll leaves or tender buds, affect the growth and development of cotton plants.
Morphological characteristics Adult body length 10-14mm, wings 22-30mm, pale yellow, head, chest, back 12 dark brown dots arranged in 4 rows; abdominal sections of the front edge of a yellow-brown band. Antenna filamentous. The horizontal lines of the front and rear wings are brown and corrugated. The front edge of the front wing chamber has an "OR" shaped brown spot. Under the "R" spot, it has a black line. The bristles are yellowish; The end has a slender brown ring, the outer horizontal line is meandering, the outer edge line and the sub-lateral edge line are corrugated, and the bristles are pale yellow. Oval flat oval, 0.12mm long, 0.09mm wide, milky white at first, then light green. The last-instar larvae are blue-green, with a flash of light, about 25mm in length, turning pinkish in front of the pupa, having sparse long hairs on the body, black chest and hip feet, and semitransparent gastropods. It is 13-14mm long, red-brown and slender.
Living habits 3 generations in Liaoning, 3 generations in the Yellow River Basin, 4 generations, 4 to 5 generations in the Yangtze River Valley, 5-6 generations in South China, the last instar larvae in the leaves, bark seams, stump holes, field weeds in the winter. Densely growing plots occur in rainy years. Adults have phototaxis. The natural enemies of larvae are leaf-worm insects, larvae, larvae, Japanese aphids, and broad-legged bees.
Control methods (1) When the larvae are rolled and wrapped, they are packaged and disinfested. (2) With 10% imidacloprid active ingredient 50-60g mixed cotton seed 100kg, within 2 months after sowing, the control effect on cotton leaf leafhopper is excellent, and concurrently treating cotton aphid. (3) Spraying 25% ikasei (quinquid) or 50% octoside, emulsive, phosphoamine, quinine, etc. are all effective at the spawning period to the egg hatching stage.
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