Cotton cotton bridge

Scientific name Anomis flava (Fabricius) Lepidoptera, Nightingale. Alias ​​cotton moth, small bridge insects, step music, small bridge moth and so on. In addition to Tibet and Xinjiang, the distribution of various cotton planting areas throughout the country.

In addition to the damage to the host cotton, but also damage jute, ramie, tobacco, wood mold, mallow and so on.

Damage characteristics The larvae damage the leaves of cotton and other foods and eat them as nicks or holes, often eating the leaves, leaving only the leaves and veins. The damage of cotton bolls to young bells cannot be fully matured, which has a great influence on cotton yield and quality.

Morphological characteristics Adult body length 10-13mm, wingspan 26-32mm, head and chest orange, yellow and brown back to the abdomen; forewing female light yellow-brown, male tawny. Antennae dentate, female filamentous. The center of the outer edge of the fore wings protrudes outwards like a horn; the inner half of the wing is light yellow and reddish-brown and the outer half is dark yellow. Sub-baseline, inside, centerline, outside brown, sub-baseline slightly semi-elliptical, inside the outer oblique and folding angle, the meandering end of the midline is close to the inside line, the outer half of the meandering is not very obvious, the sub-line purple gray jagged, ring pattern white The ring has brown edges, brown kidneys, and 1 black dot on each side. Oval oval-shaped, 0.60-0.65mm long, 0.26-0.33mm high, green to brown green, the top of the bulge, the bottom is flat, the top of the egg shell corolla is obvious, the shell has vertical and horizontal ridges into an irregular shape of the box. Larvae body length 33-37mm, width of about 3-4mm, the head pale yellow, yellow-green body. Topline, Asian backline, valve line gray-brown, with a discontinuous white spot in the middle, the valve on the line more obvious. The valve is oval, the valve is yellow, and the valve is brown. The first pair of gastropods was degraded, the second pair was shorter, and the third and fourth pairs had 18-22 pairs of toe hooks. When crawling, the middle part of the worm body arched like a ruler. Reddish-brown, with 1 papillary protrusion in the middle of the head, 3 pairs of hip thorns, and hooked ends on both sides.

Living habits The Yellow River Basin is 3-4 generations old, the Yangtze River Basin is 5-6 generations, and the southern part of the Yangtze River is wintering with the earthworms. The north has not yet been found to be overwintering. The first generation of larvae is mainly responsible for wood molds, ramie, etc. The second and third generation larvae damage the cotton. The larvae of the first generation were destroyed in the middle and late July, the second generation in the middle and early August and the third generation in the middle and early September. Eggs are scattered on the back of cotton and other leaves, 1 female moth eggs up to 800, usually 80-400. The newly hatched larvae are active, and they are frightened to roll. The l, 2nd instar larvae feed on the lower leaves, and they are transferred to the upper part of the leaves. They enter the overeating period after the 4th instar. In young larvae, the larvae start to hang down, and the old larvae burrow in the lobe and turn into a pack. Natural enemies include T. urticae, I. gifu, Trichogramma, grass beetle, wasp, florets and ladybugs.

Prevention methods (1) Use black light or high-pressure mercury lamp to seduce adult. (2) Do a good job of forecasting and strengthening the control of larvae in cotton fields. From the end of hatching of larvae to the height of the third instar, when 100 larvae reach 100 heads, spray commonly used organic phosphorus concentrations such as dichlorvos and malathion, or 50% octyl cyanide 1500-2000 times liquid, 20% fenpropathrin EC 1500 times, 40% Chrysanthemum EC 2000 times and other compound, can also be used 10 billion live spores / Bacillus thuringiensis WP 500-10oo times.