Cotton cotton ovary

November 22, 2023

The scientific name is Calomycterus obconicus Chao. Coleoptera, Iglyphidae. Alias mulberry small gray elephant worm. Distribution of Jiangsu, Zhejiang, Sichuan, Shaanxi, Hebei, Guangdong, Fujian and other provinces.

Host cotton, rapeseed, soybean, tomato, mulberry, ramie and so on.

The damage is mainly characterized by the damage of cotton seedlings. When severe, the petioles are snapped and the leaves are eroded.

Morphological characteristics Male adult body length 3.3-3.6mm, width 1.6-1.8mm; female body length 3.5-3.9mm, body dark gray, trapezoidal head, short thick, brown end, Compound eye black, oval. The tentacles were elbowed at 11 knots, and the shank was 1/2 in length and 3 in whip. Pronotum with many small granular projections, dense dark gray scales. 1 pair of elytra wings, vertical surface engraved on the wings engraved with 10 spots, and dense round gray scales, slightly raised between the lines. Egg length 0.8mm, colostrum white, after dark brown. The last instar larvae have a body length of 3 mm and are milky white at the time of hatching, and then gradually yellow, body 12 sections, spindle-shaped, often curved.蛹 2.5-2.9mm long, colostrum white, later turned brown. (Figure left)

Living habits 1 year old in Zhejiang, larvae in the soil under the winter, in mid-May next year, phlegm, the first generation of adult emergence in late May, adults eating on the ground weeds, after the emergence of cotton, began to damage the cotton seedlings or The tree was damaged by mulberry and mated and spawned in early July. The eggs hatched in mid-July and the adults were suspended dead.

Control methods see cotton tip.

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Author:

Mr. Yang

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