The scientific name Dasychira baibarana MatsÎ¼mura is a lepidopteran, poisonous moth family. Alias â€‹â€‹tea tussock moth. Distribution of Zhejiang, Hunan, Sichuan, Jiangxi, Anhui, Guizhou, Yunnan, Taiwan and other places.
Host tea, oil tea.
The characteristics of the larvae larvae jujube tea leaves into a short cut or hole, when serious, leaves, tender shoots, light, affecting the production and quality of the following year. Larvae touch the body caused redness and itching.
Morphological characteristics Adult moth female body length 15-20mm, wingspan 32-40mm, male moth slightly smaller. The black wings of the adult body are black, the base of the forewings are dark, and the horizontal lines are dark. They are thin and curved. There are three to four vertical stripes near the vertical angle, and there are nearly gray and white round patches near the middle and middle edge of the wings. There is 1 dark brown patch underneath, and 1 white spot appears below. The back wings are lighter in color and have no markings. There are 3-4 black hairs in the abdomen. Egg diameter 0.8mm, nearly spherical, slightly concave at the top of the center, gray to black. The last-instar larvae were 23-32mm long, brown-headed and black-black, with 1 pair of brown hairs on the back of the 1-4 sections of the abdomen, and 1 pair of yellow hairs on the 5th section, and dark brown hairs on the 8th section. . Two pairs of white hairs are on the chest and tail. Long ll-17mm, black. Tan tan, silky.
Habitat 4 generations of life, Anhui, born 4 to 5 generations. Winterize eggs on the back, twigs or withered leaves of tea leaves. The next year in March next year hatched in early April. The 2, 3, and 4th generation larvae occurred in June, mid-July, mid-August, late August, and late September. The adult phototaxis is strong, the white fleas are quiet, and the nighttime activities are followed by mating on the day after emergence, and the eggs are massed or scattered in the tea bush or in the lower part of the leaves. Each female produces 100-200 eggs and the egg period is 7-10 days. The larvae were 5th instar. The newly hatched larvae clustered on the back of the old leaves to feed on the leaves. They were dispersed after the 2nd instar, and they were pleasing at dusk or early morning. Larval period 20-27 days. After getting mature, climb to the base of the tea bush, under the fallen leaves or in the earth seam. In the ten-day period of the pupal stage, adults live for 5 to 12 days. The insects prefer a warm and humid climate, and there are few occurrences in hot and dry years.
Prevention methods (1) Strengthen the management of tea gardens and clean the garden in winter. Pay attention to the removal of egg mass during the growing season. Trimming tea tree underground branches, internal litchi, pests and branches, require branches and leaves 27-33cm below the ground to cut all clean, to improve the ventilation and light conditions of tea trees, eliminate some of the tea caterpillar overwintering eggs effective. (2) The larvae are sprayed with 80% trichlorfon or 50% chlorpyrifos-fungus emulsifiable concentrate and 50% malathion-containing EC 1000 times before the third instar, and may also be sprayed with 5000 times of 10% Pentamethrin EC. (3) Applying 2.5% Uranus Emulsion 20 to 25 ml per 667m2, implement low-volume spraying and have excellent control effect. (4) It is also possible to use 2% Badan powder or 2.5% trichlorphon powder on the ground and shake the tree to kill the larvae. (5) Promoting the use of Chaetoplasma nucleopolyhedrovirus, a 700-750108 polyhedrin virus is used per km2, which is equivalent to the content of 40 dead and dead insects, 40 kg of water, to the tea bushes at the peak of overwintering larvae 2-3 years old. Low-position tendency spray, contemporary larval mortality rate 80%.
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