The scientific name Pinnaspis theae (Maskell) synonym P.theae Green is a Homoptera, shielded family. Alias ​​tea, tea brown shield fried, tea fine scale insects. Distribution Anhui, Jiangsu, Zhejiang, Guangxi, Guangdong, Fujian, Guizhou, Taiwan.
Host tea, mulberry, citrus and so on.
The nature of the damage is to use nymphs and female adults to suck and drink sap from the foliage. The damaged tea tree is debilitated, germination is reduced, the number of clips is increased, the yield is reduced or the tea tree is killed.
Morphological characteristics The female shell is nearly pear-shaped, yellow-brown to yellow-brown, 3 mm long, and the front end has 2 shells. Male shells white, oblong, parallel on both sides, abaxially with 2 longitudinal furrows. Adult female adult pear-shaped, light yellow or yellow, body length 0.64mm or so, the back chest, abdomen before the first 3 extra-wide, body wrinkles, surrounded by short hairs; male adults slightly smaller, brown body, wings white, tentacles l0 Section filiform. Egg length 0.15 to 0.18mm, oval, pale yellow to brown, egg shell white. The newly hatched nymphs are light yellow to yellow. 0.58mm long, long oval, brown.
Living habits 3 generations in Zhejiang and Anhui, wintering with fertilized female adults on both sides of the trunk or leaf veins. At the beginning of March of the following year, the female adults of wintering began to spawn until mid-April. In late April, the first generation nymphs began to hatch, and in mid-May, they entered the incubating period. The second generation of nymphs entered the incubating period in late June and early July. Three generations of irregularities occurred from mid-August to November. Male adults like to crawl on the leaves or branches after noon emergence, looking for females to die after mating, life expectancy l days. After the female adults are fertilized, the eggs are laid in the shell. Spawning 18-20 tablets, more than 80 tablets. The newly hatched nymph climbs out of the shell and crawls on the branches or leaves. After 2-3 hours, select the appropriate part, insert the mouthpart into the sucking juice, and start to secrete the wax to cover the back of the body. A total of 3 female instars became female adults after 3 instars; the males had a total of 2 instars, and they became pre-larvae at 2 instars. The main natural enemies are red dot ladybugs, parasitic bees, and parasitic flies.
Prevention methods (1) Agricultural control Rational application of fertilizers in tea gardens, timely weed control, and appropriate cutting of legumes and leaves with insects to keep them away from the occurrence of tea pods can reduce the incidence of this pest. (2) Apply 40% Dimethoate or 50% Malathion EC and 25% Dimethoprim EC 800-1000 times to the 2nd instar nymph. The insect shell is thin, as long as the positive and negative sides of the leaf are sprayed wet, they can receive better results. (3) Strengthen tea quarantine and eliminate the source of insects.
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