Tea tree false eye small green leafhopper

Scientific name Empoasca vitis Gothe Homoptera, leafhopper family. Alias ​​fake eye small green dust, small green leaves. Common names such as leafhoppers. Distributed in Jiangsu, Anhui, Zhejiang, Jiangxi, Fujian, Hainan, Hunan, Hubei, Guangdong, Guangxi, Sichuan, Guizhou, Yunnan, Shaanxi and Taiwan.

Hosts tea plants, peanuts, soybeans, wheat, cotton, mulberry, tobacco, cruciferous vegetables, fruit trees, medicinal plants, etc.

Injury characteristics, nymphs sucking shoots of tea trees, shoots of tender shoots; female adults lay their eggs in young shoots, impeding the transport of substances, causing yellowing of leaf edges of tea tree shoots, curling of tips of leaves, dark veins in veins, and severe The tips of leaves and leaf margins are reddish-brown and scorch-like. The growth of shoots is slow or even stagnant, affecting the quality of tea leaves. In recent years, the small green leafhoppers and small green leafhoppers have been mixed and mixed in some tea areas. The former is a dominant species in many provinces.

Morphological characteristics Adult body length 3.1-3.8mm, body yellow-green to yellowish green, the middle of the head there are 2 green spots, compound eyes gray-brown, no monocular, only a pair of green small circles in the monocular position, say false Monocular. Small scutellum with pale white patches on the center and ends. The forewings are light yellow-green, green at the base, and translucent or slightly fuzzy. The foot of the foot is green below. Egg length 0.8mm, crescent, colostrum after white light green. A total of 5 instar nymphs. The newly hatched nymphs were 0.95mm long, milky white, and had fine hairs on the body surface; the 2-year-old body length was 1.30mm, light yellow, and the body segments were obvious; the 3rd-age nymphs were 1.64mm long, and began to show their wing buds; 08mm, wing buds obvious; 5th instar 2.24mm, light green, wing buds reach the abdomen Section 5, body shape and adult approximation.

Life habits are 10 generations in Anhui, 9-ll generation in the Yangtze River Valley, 12-13 generations in Guangdong, Guangxi, and 15 generations in Hainan. Adults in the provinces all overwintered on host plants such as tea plants, winter beans, and green manure. There were no overwintering phenomena in Guangdong and Yunnan, and eggs and nymphs were also seen in winter. The overwintering adults in the tea region of the Yangtze River Valley started their activities at temperatures above 10°C in late March and spawned at the end of March. After the first generation of nymphs appeared in mid-April, generations took place 15-30 days apart, overlapping each other and entering 1 Winter begins mid-month. There are two peaks in this worm every year. The first peak appeared in late May and early July, and summer tea suffered heavy damage; the second peak appeared in September-November. The egg period is 6 to 19 days, and the nymph period is 6 to 20 days. The adult life span is 2 to 21 days, and the overwintering period is 150 days. The larvae have tenderness, and they like to inhabit at the buds and on the back of tender leaves. The number of 2-3 beetles under the buds is large. After the third instar, the nymphs and adults lively, rampant or jump. In the hot sun or rainy days of noon, when the dew is still dry, they hide in the flowers and do not move or only move among the bushes. On the day of or after the emergence of the eclosion, the eggs were spawned on young tissues of tea plants or on the 2-3 buds. In the spring, there were 32 eggs per female, 9 in summer, and 12 in autumn.

Prevention methods (1) Soybean crops were not asked in the tea garden and weeds were eradicated in time. (2) Timely picking tea, found that the shoots on the shoot removed at any time, there is a clear inhibitory effect. (3) When there are 20 to 25 worms per lobe before the first peak of the spring tea, spray 90% crystal dipterex 1000 times or 50% phoxim EC 1500 times, and 50% kill pine. Emulsion 1200 times, 25% eugenol emulsifiable concentrate 1500 times, 10% imidacloprid WP 2000 times, 10% Xingmianbao emulsifiable concentrate 2000 times, 10% Uranus emulsifiable concentrate 3000-4000 times. (4) In areas with high humidity or seasons, it is recommended to spray Beauveria bassiana containing 8 million spores per ml.