The scientific name Cocytodes coerulea Guenee is Lepidoptera, Noctuidae. Widely distributed throughout the country.

Host to hemp, ramie, ramie, flax, soybeans and so on.

Injury is characterized by the larvae feeding into nicks or holes, leaving only leaves and veins severe. The affected strains grow slowly or stagnate, the plants are short, the jute is thin, and the fiber quality is low.

Morphological characteristics Adult body length 20-30mm, wingspan 50-70mm, body, wing tea brown. The fins of the forehead have a nearly brownish brown spot; baselines, lateral lines, wavy or jagged lines in the transverse lines; black; ring-shaped lines in black, small dots; kidney lines in tan, with intermittent black borders; 8 black spots. The rear wings are bluish green with 3 stripes. The egg is about 1mm long, flat round, beige, there are radial stripes on the egg shell, and stripes between the vertical stripes. The larvae are 60-65mm long. Before the 3rd instar, it was light yellow-green, and after 3rd instar, it became yellowish white or black type: yellowish-white type, with yellowish-brown head and fine cloth. Body yellow-white, the former chest scuttles, hips orange-yellow; valve line, valve line black, pink valve around the abdomen, the back of each body with dark stripes 5-6, chest full-brown, abdominal feet outside the black. Black type, body black, head, front chest scutellum, gluteal yellow-brown; valve line, valve on the line of yellow, the back of each body with yellow short horizontal stripes 5-6. It is 24-33mm long, brown to dark brown in color, and has a thick body. Its wing buds reach the posterior border of the fourth abdominal segment. The antennae are long and the abdomen has two thick-tailed spines. Living habits The Yangtze River Valley is born 3 generations old, and adults spend their winters in the fields, grasses, earth seams or bushes. In the middle and early May of Hunan, a generation of larvae prospered, in the second generation in early and mid-July, and in the third and third generations in late August, adults were hidden in the paralysis or in the bushes near the Ma Tian during the daytime. The activity was strong at dusk and before dawn. The eggs are laid on the back of the leaves of the hemp plant and have concentrated spawning habits and phototaxis. The eggs hatched after 6 days and the larvae had 6 instars. The newly hatched larvae cluster damage the top of the leaves, the leaves of food into a sieve-like holes, larvae active, after the startling drooping drooping or to the abdominal foot, caudal foot tightening spore leaves around the head, spit yellow-green juice. After 3rd age, it was scattered and infested. After 5th instar, the food intake increased rapidly and 3-5 leaves were eaten every day. 16-26 days of larval period, after the old mature crawl to the nearby dry branches, fallen leaves or in the topsoil. The weather with high temperatures, high humidity, or when it is raining occurs.

Prevention methods (1) Check the fields from late May to late August. Take care to remove the leaves and larvae of the eggs and focus on the treatment, deep-buried or burned. (2) After the harvest of the first crop in early June, when the first generation of larvae enters the soil, timely cultivating can eliminate the maggots, and when the tussahs are harvested, several sesame plants are left to trap the larvae and kill them. (3) When the 3rd instar larvae colonize, the insects should be checked before the dew begins to dry in the morning, and the grass ash or 2.5% trichlorfon powder should be removed from the back of the leaves to kill the young larvae before dispersion. (4) If necessary, spray 50% phoxim EC 1500 times or 2.5% deltamethrin EC 3000 times and spray 50-75L of good liquid per 667m2.

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