Scientific name Earias cupreoviridis Walker Lepidoptera, Noctuidae. Distribution in addition to Xinjiang, the country has been distributed in the cotton districts. The Yellow River Basin and the Yangtze River Basin are widespread.
Host cotton, winter vegetables, hollyhock, ramie, kenaf, sunflower and so on.
The characteristics of the newly hatched larvae damage the cotton heads and young leaves, and the tender heads suffer from clusters of lateral branches. The larva is slightly larger and eats buds and flowers. In the middle of the bud, there are bore holes, round holes, and the size is 3mm. There are no insect feces in the buds. There are tiny black fecal particles around the outer holes of the buds. The buds in the buds are hollowed out, and the buds are open and dark brown off. When it is a bell, there is a round boring hole at the base of the bell. The aperture is about 2.5mm. The black fine granular excrement is piled outside the hole. The fiber and cotton seed inside the bell are damaged and the knot is dry. The small bell falls off and part of the bell is removed. Cockroaches do not fall off, but they can easily cause dead bells or form a deadlock.
Morphological characteristics Adult body length 6-8mm, wings 16-16mm. The lower lip, the forefoot and the forefront are all plum red, the fore wings are basically yellow-green, the outer corners are orange-yellow, the outer edge is wavy brown, and the wing has three small spots. Egg-shaped fish, blue-green, the finger white-gray, upper brown-black diamond pattern diamond. The last instar larvae were 10-15mm long, grayish-green, and each had 2 stumps from the 2nd to the 12th branches. The lower part of the head plate was orange, the lip base was orange, and the upper brown round spot appeared. The eighth section of the abdomen was gray and gray. Big.蛹 7.5-9.5mm long, auburn, with 3-4 protuberances on both sides of the anus.
Life habits Hebei, Henan, Shanxi, Sichuan, and Hubei are 4-6 years old, mainly 4 generations, Jiangsu and Guizhou are mainly 5 generations, and Hunan and Jiangxi are mainly 6 generations, and they use dry grass and dry litter. Earth seams, grasses on the ground, wintering fields, seed cotton warehouses, etc. Adults lurked on the back of the cotton leaves and on the buds of the leaves during the day. They began to be active at night and were most active from 2 to 5 o'clock. Spawning was mostly performed at night, and spawning began on the second day after mating. The average daily temperature was 22.9°C, the egg period was 5.5 days, the oviposition period was 15 days, the larval period was 18.9 days, the flood period was 12.6 days, and the adult period was 9.8 days. The worm can produce 542 eggs throughout its life. The eggs are produced on the top of the cotton plant and on the tip of the upper fruit branch and on the young bud.
Prevention methods (1) In winter, combined with the prevention and treatment of the winter bollworm, treat bolls, dead branches and fallen leaves on the cotton stalk, and overwintering insects in the warehouse. In early spring, plant the winter chillies, hollyhock, okra and other trapping plants in the vicinity of the cotton field. Kill. (2) When 100 plants have 15-20 eggs or the rate of damage to the tender head reaches 3%, spray 90% crystal trichlorfon l000 times or 50% methyl parathion 1500 times, 50% methamidophos EC 1,000 times liquid, 25% cyanomethrin EC 2000 times, spray good liquid 50kg per 667m2. In addition, 80% of dichlorvos emulsifiable concentrate 80ml, 2kg of water, and 20kg of fine soil can be used in the cotton field that has been sealed in the evening.
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