The scientific name Stephanitis chinensis Drake synonym Sphephanitis chinensis Drake Hemiptera, Meliaceae. Alias ​​tea army with insects, white yarn mother and so on. Distribution of Guangdong, Guizhou, Sichuan, Yunnan and other provinces. It is an important pest in southwestern tea areas.
The host tea tree, oil tea and so on.
The characteristics of damage to nymphs, nymphs clustered in the back of the leaves sucking juice, caused by the victims of the leaf is now a lot of dense white spots, afar a tea tree gray. Black mucous excrement appears on the back of leaves, affecting the photosynthesis of tea plants. In severe cases, leaves fall off, the tree vigor is weak, and the tea buds germinate slowly and are small or the germination stops, affecting the yield and quality.
Morphological characteristics Adult body length 3-4mm, small flat body, dark brown, with a reticular pattern on the front chest. The backboard is well-developed, with the head protruding forwards, and the small scutellum extending rearwardly, with thin, round-shaped lateral backs protruding from both sides. Wings are oval in shape, transparent and full of mesh patterns. The forewings have a longitudinal vein with two dark oblique stripes in the middle. Antennae knee-shaped, 4 knots, the longest in the third quarter. Abdomen black with a dark vertical groove. The egg is oval in shape, milky white, slightly curved at one end and covered with a glossy black gel. If the insect body resembles an adult, it has no wings and the body color varies with the age of the worm. A total of 5 instar nymphs. The 5th instar larvae were about 2 mm in length, black in body, red in compound eyes, and obvious wing buds. There were 3 isosceles triangles in the top of the head and a black spot in the center of the chest. The seventh, eighth and tenth sections on the back of the abdomen had one Protuberances with dark white edges and 8 pairs of thorn-like protrusions on both sides of the body section.
Living habits Guizhou and Sichuan are born 2 generations old. They use eggs on the back of the lower leaves of the tea bushes and the midribs and the tissues on both sides are overwintering. The lowland tea gardens also have winters as adults. The wintering eggs hatch in mid-April to early-May in the following year. The overwintering generation of nymphs will enter adulthood in mid-May, middle-May, middle-July and mid-July, and will enter the peak period in mid-and late-May. The second-generation egg stage enters the nymph stage in late May-September, late July and late October, and enters the nymph-emerging period in mid-August. In mid-August, adult worms began to appear in December and December, and adult worms flourished from mid-September to early October. The occurrence period of each generation in Guizhou is often 10 to 20 days earlier than in Sichuan. Throughout the year, the first generation occurred neatly and concentrated. The occurrence of early, full, and late stages was obvious, and the population density was large, often 3-4 times that of the second generation. The damage was severe. When the adult was first emerged, the whole body was white. After two hours, the pattern was revealed on the wings, the color of the abdomen was deepened, and the color of the black lines and abdomen on the wings gradually increased with time. The adults of the first eclosion are weak in life, and the adults fly poorly, often lying on the back of the leaves or crawling between the branches and leaves. Four days after emergence, active mating began. Adults mostly copulated in the morning and lasted for 30-90 minutes. The number of eggs laid per female was at most 34, and at least six, averaging about 16 capsules. Adults prefer to lay eggs in the tissues on both sides of the middle and lower back veins in the middle and lower leaves of the tea plexus and cover them with black glial material. The average egg period is 93 days, the longest is 106 days, and the shortest is 87 days. The newly hatched nymphs climbed out of the egg shells, first sucking juice in the lower and middle leaves of the tea bushes, and then spread to the upper part. The nymphs are clustered and often clustered around the main leaves and lateral veins of the leaves, arranged in neat rows, and begin to disperse as their age increases. The first generation of 18-24 days, an average of 20.8 days; the second generation 2l-26 days, an average of 22.4 days. The temperature and dryness of the day are serious. General nymphs occur during the peak period in the temperature of 2l 23 °C, relative humidity of 75% to 80% of the climatic conditions, on the contrary, high temperatures, high humidity, light occurs.
Control methods (1) The emergence of a young nymph at a young age is a critical period for the control of this worm. Generation nymphs occur more neatly, have strong clusters and are weak in drug resistance, so they have a higher control effect. The agent can be used 40% Dimethoate or 50% Malathion EC 1500 times, 80% Dichlorvos 1000-1500 times, and 90% Trichlorfon 1000 times. Spraying requires uniform and thoughtful, so that the back of the blade can be stained with liquid medicine. After about 15 days, it is better to prevent it once again, and it has a great effect on controlling insects throughout the year. (2) Severe pruning of tea plantations in early spring will eliminate overwintering eggs, and the branches and leaves that are cut will be treated centrally. (3) The protection forces are equipped with blind enemies and other natural enemies.
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