The scientific name is 10pholeucaspis japonica (Cockerell) Homoptera, Saccharidae. Alias ​​Changbai, Changbai scale insects, pear Changbai scale insects, Japanese Changbai wolfberry, tea dumplings and so on. Synonyms Leucaspis japonica Cockerell. Distribution Jilin, Liaoning, Hebei, Shanxi, Shaanxi, Gansu, Sichuan, Ningxia, Qinghai, Taiwan, Guangdong, Guangxi, Guizhou, Yunnan. Host tea, apples, pears, plums, plums, oranges, persimmons, alfalfa, hawthorn, figs, etc. The morphological characteristics of the shell is 1.68-1.80mm long, spindle-shaped, dark brown, with a layer of white opaque wax, a shell point, head protruding. The male cicada shell is long, white, and the shell points prominently at the head. Adult female adult body length 0.6-1.4mm, pear-shaped, light yellow, no wings. Male adult body length 0.5mm-0.7mm, light purple, darker head, 1 pair of wings, white translucent, with a needle-like copulator at the end of abdomen. Egg length 0.23mm, width 0.11mm, oval, light purple. The nymphs were 0.2 to 0.31 mm in length, 5 sections of antennae, 3 pairs of feet, and 2 tail hairs at the end of the abdomen. Females were 3 instar and males were 2 instars. At the end of the first age, the body length is 0.39mm, and the body is covered with a white waxy shell. The second instar larvae have a body length of 0.36-0.92mm, and their body color is light purple or yellowish, orange yellow and purple yellow, and the antennae and feet disappear, and the body back shell is gray. The third-instar nymphs were pale yellow, with arches at the end of the abdomen at 3 and 4 knots. The former is 0.63 to 0.92mm long, long oval, light purple. It is 0.66-0.85mm long, slender, lilac to purple. Antennae, wing buds, and feet are all present, with a needle-like mating device in the abdomen. Control methods (1) Prevent the transfer of the shell insect seedlings to the new tea area. (2) The victim tea plantation should be renewed in Taiwan, and Taiwan Liu should step up management to prevent the remnants of the Changbai River from spreading. (3) Predict the method of glass tube prediction for the egg hatching of Changbai quail, that is, determine the maximum number of hatching insects in the glass tube in the room, and push it backward for 3-4 days, which means that the control period is appropriate. The second is the use of microscopic examination and prediction method, which means that the egg-laying rate of the long-term observation females is 84%, and then the average duration of the egg generation is pushed back, which is the incubation period. The third is related forecasting method. According to the average temperature in March and April, it predicts the end of its incubation period. When surveying 150 to 250 worms, it reaches the control index. The prevention and control should focus on the 1-2 generations of nymph hatching. (4) Spray 50% malathion EC 800 times or 50% phoxim EC, 25% ECS, 25% Bupropion 1000 times wet solution in time of nymphs incubation. The third generation can be controlled with 10-15 times rosin mixture or 25 times crude oil emulsion. It is also possible to spray 0.5 in autumn and winter. Lime sulfur. The spray quality has a great influence on the control effect, emphasizing uniform and thoughtful. 3 Layers Earloop Disposable Face Mask Bacteria Protection Face Mask,3 Ply Breathable Face Masks,3D Stereo Face Mask,3 Layers Earloop Disposable Face Mask Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com
The characteristics of damage to nymphs, female adults sucking tea sap, damage to the tea plantation tree weakness, leaves thin, sparse, tea garden premature aging. The worm can also form a dense settlement in a short period of time, covered with stems or leaves, causing serious defoliation, germination greatly reduced, continuous victimization 2-3 years, branches dead or the entire plexus of death. It is a devastating pest on tea trees.
Life habits Jiangsu, Zhejiang, Anhui, and Hunan have three generations of tea in the area. They use the last-lasting female nymphs and the male crickets to dry over the winter in the tea branches. From late March to late April of the following year, the female adults emerged. The female adults in the middle and late April started to spawn. The first, second and third generations of nymphs hatched mainly in late May, late July and early September. In early October. The first and second generation nymphs hatched more neatly, and the third generation lasted longer. The duration of each insect state: egg period 13-20 days, nymph period 23-32 days, female adult life span of 23-30 days. The female adults lay their eggs in the shell and each female produces 10-30 eggs. The nymphs crawl out of the shell after hatching. The nymphs hatch vigorously at noon in the sunny day, and the newly hatched nymphs lively climb. After 2-3 hours, the mouthparts are inserted into the tea tree tissue to fix the body and suck juice. After being fixed for one hour, a white waxy shell is covered and covered on the back of the body. . The females were 3rd instar and later became adults; the males were 2nd instar and became the anterior instar after 2nd instar. The first and second generations are distributed on the leaves more than on the branches. The males mostly inhabit the leaf margins or edge teeth. The females are mostly distributed on the branches or near the dorsal midvein. The third generation of males and females are distributed in the middle and lower branches of the branches and are rare on the leaves. Tea trees grow thick, branches and skin are thin and heavy. Changbai Mountain fertility temperature of 20 to 25 °C, relative humidity higher than 80% prone to occur. The tea plantations were covered with dampness, partial application, over-application of nitrogen fertilizer, declining growth of tree vigor, young tea plantations, and rejuvenation of tea gardens in Taichung.