Cotton Bridge

Scientific name Astisis selenaria (Schiffermuller etDenis) Lepidoptera, Geometridae. Distributed throughout the country.

Host cotton, citrus, pears and so on.

The larva eats buds and tender stems when it is seriously damaged.

Morphological characteristics Adult body length 15-20mm, wingspan 38-45mm, body color variation is very large, with yellow and white, light yellow, light brown, light grayish brown, generally light grayish brown, horizontal lines and markings on the wings are dark Brown, with 1 streaks on the mid-ventricular side, sub-baseline and lateral jagged lines of the forewings, grayish-yellow, some individuals can see midline and sub-line, and there are 1 plaque near the middle of the outer edge; Serrated, its inside is grayish yellow, and some individuals can see the horizontal and sub-line. Female antennae filamentous, male feathered, pale yellow. The egg is long and oval blue green. Larvae body length 38-49mm, yellow-green. The head is brown to brown green, with black spots on both sides of the head. The back line is light green to blue-green, the subline is grayish green to black, the valve is dark green, the valve line is yellow and there is a fine black line, the valve is off the line to the end of the abdomen, yellowish green; on the third and fourth abdomen Black-brown spots, black valves, light yellow valve, chest-brown foot, 2 pairs of gastropods born in the 6th and 10th abdominal segments, yellow-green, black end. About 14mm long, dark brown shiny, pointed tail, 2 hips.

Living habits The Yangtze River Basin has four to five generations of annuals, and spends winters in the soil. Various generations of adult emergence period: in mid-June, mid-July, mid-August, mid-September, and mid-November, there may be a small number of fifth-generation adults. The 2nd to 4th generations of the eggs are 5-8 days, the larvae are 18-20 days, the flood season is 8-10 days, and the first generation takes 32-42 days. Adults grow into nighttime, strong phototaxis, spawning 2-3 days after emergence, prolific on the ground, earth seams and grass stalks, when the major occurrences, stems, leaves can be produced, dozens of grains to more than one hundred grains into Heaps of 1000-2000 can be produced per female, while only over 200 can be obtained in wintering. The newly hatched larvae can be spread and spread by the wind. In October-November, the last larvae were ploughed into the earth for winter. This worm is an intermittent fulminant pest, and it usually occurs in crops such as cotton and beans.

Prevention methods (1) black light trap adult. (2) For other methods, see Cotton Bridges.