Scientific name Aeolesthes induta Newman Coleoptera, Cerambycidae. Alias ​​yew tree Tianniu, strains Tianniu, thief and other old insects. Distributed in Jiangsu, Anhui, Zhejiang, Jiangxi, Fujian, Hunan, Guangdong, Guangxi, Taiwan, Guizhou and Yunnan.
Host tea, oil tea, oak, pine and so on.
Characteristics of damage The larvae feed on branches and roots, resulting in debilitating tree vigor. The upper leaves are yellow, the shoots are thin and thin, and the branches are easily broken. In severe cases, the entire plant is withered.
Morphological characteristics The adult body is about 30mm long, dark brown, shiny, with short brown hair. The center of the head has a longitudinal ridge. The compound eye is black and the two compound eyes are almost at the top of the head. The compound eye has a short, shallow groove behind it. The middle and upper segments of the tentacles protrude outward and produce a small spine. Female antennae approximate body length. The antennae of the male are nearly 2 times the body length, the width of the chest is longer, the front is slightly narrower, the middle is swollen, the sides are curved, the back is wrinkled, the small scutellum is obtuse, and the cobweb is light brown and dense. Fluffy, fluffy and shiny, arranged in an irregular square, like a pattern. The eggs are about 4mm long, about 2mm wide, long oval, milky white. The last instar larvae are 37-52mm long, cylindrical, with a pale yellow head, breasts, abdomen milky white, large forequarters, and 4 brown-brown plaques on the front of the hard-skin board. There is a zig-zag pattern on the posterior border. In the posterior chest, a sarcoma-like bulge appears at the center of the abdomen of the lumbar urea.蛹 25-30mm long, milky white to light tan color. (Figure left)
Habits occur over a period of 2 or more years, and larvae or adults overwinter in the stem or root of the host. The overwintering adults of Jiangxi Province appear in late April and early July of the following year. The eggs are laid at the end of May. The larvae begin to hatch in early June. The winters in late October, the next year in late August and the end of September, and in the middle of September, a month in January. Only adults emerged mid-emergence, adults did not emerge after emergence, and spent the winter in the dormitory, and did not start commencing until the end of April of the third year. The eggs were produced on the branches 7-35 cm above the ground and 2-3.5 cm thick stems. Eggs spawn in cracks or branches on the bark. The newly hatched larvae ate under the skin, entered the xylem 1-2 days later, and then tunneled down to more than 33cm underground. Small excretory holes are left 3-5cm in the ground and insect dust is piled on the ground outside the hole. The mature larvae rise to the 3–10 cm surface of the tunnel and grow to grow into a circular, calcareous clam. The Tianniu is in serious trouble in mountain tea gardens and old, weak tree tea gardens. The old tea tree with the exposed neck is heavy.
Control methods (1) Before the adult is excavated, 5kg of quicklime, 0.5kg of sulphur powder, 250g of beef rubber, and 20L of water are blended into a white coating agent, which is applied on branches or roots and necks 50cm above the ground to reduce the production of the cattle. egg. (2) The tea plant is cultivated in the rhizosphere in time to prevent the exposure of the root and neck and adult oviposition. (3) Light trapping of adult worms or artificial capture in the early morning during adulthood. (4) Inject a 50-fold solution of dichlorvos, dimethoate and other insecticides 40 into the drain hole, and then use a mud seal to poison the larvae. (5) The stems and leaves of the 100-rooted roots cut into 4-6 cm long or Pinellia are chopped and stuffed into the wormholes to kill the larvae.
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