Scientific name Contarinia sp. Diptera, ticks and mosquitoes. Distribution of Guangdong, Guangxi, Hainan and other southern tea regions. More often occurs in or near mountains.
Host tea tree.
The larvae damage the tea buds, stimulate the development of malformation and swelling of tea buds, and form worms, affecting the growth and development of tea and the quality of tea. Morphological characteristics Female adult mosquitoes are 2.5-3mm long, wingspan 4-4.8mm, yellow-brown and dark brown hairs. The head is flat and round, compound eye is black, two compound eye contact, there is no monocular eye. The antennae are 14 knots, and the stalk section is round and short, the whip section is cylindrical, and the first whip section is longer than the other sections. The thoracodorsal bulge, backplane dark brown developed, nearly triangular. Yellowish-brown wings, 5-6 irregular dark brown patches on the wings, simple veins. Slender feet, section 5 Festival. Oviductal needles. Male mosquitoes are 2.2mm long and black. The antennae were 14 knots. The base 2 knots were similar to the female mosquitoes. The rest of the knots were dumbbell-shaped, as if they were 2 knots. The entire tentacles appeared to be 26 knots. The wing surface is dark and dark. Abdomen meat red, small. Egg length 0.12mm or so, long oval. The larvae were 3rd instar, and the 3rd instar larvae were 2-3.2mm long, spindle-shaped, yellow-white, and yellow after aging. It is 2-2.5mm long, oblong, milky to tan.
Living habits Three generations of the year in Guangdong, larvae in winter or in the earth. Emergence period of each generation emerged in late April, early May, early July and late September. The generations of each generation appear in the early days of late May, early June, late July, mid-August, early October and mid-October. The soil larvae build a soil chamber in the soil to phlegm in March of the following year. Adults after eclosion are released every day. They are not strong enough to fly, they have phototaxis, and they can mate on the day of eclosion. The eggs are produced in young sprouts of mulberry trees. On the above, each female often produces 60 to 80 eggs. Adult life l a 6 days. Newly hatched larvae are damaging in spawning buds, feeding on growing points, causing the affected buds to form pods, and do not metastasize. After being matured, they climb out from the base of the thin pods, bounce into the soil, and dormancy in the soil. Larvae were 3 instar. High-temperature, less sunny shady mountain tea gardens or high-lying tea gardens are vulnerable. Large-leaved tea trees have many insects and their density is also high. Natural enemies have wide-spotted bees and black ants.
Prevention methods (1) When tea is collected during the larvae, attention should be paid to removing the earthworms and burning them together to reduce the risk of the next generation.
(2) After the larvae emerge into the soil, they enter the soil and apply 5% phoxim granules or 2.5% dipterex powder 2-3kg under the tea stalks. They can also be made to poisonous soil and sprinkled in the topsoil. Earthworm larvae. (3) Spray 80% dichlorvos emulsifiable concentrate or 50% phoxim EC 1000 to 1500 times solution and 20% cypermethrin emulsifiable concentrate 3000 times solution in the mature stage of adult emergence.
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