Tea Tree

The scientific name is Unaspis yanonensis (Kuwana) Homoptera, Shielding. Alias ​​pointed shield. Distribution Hebei, Shanxi, Shaanxi, Jiangsu, Zhejiang, Fujian, Hubei, Hunan, Henan, Shandong, Jiangxi, Guangdong, Guangxi, Sichuan, Yunnan and Anhui.

Host tea, citrus, longan, guava, etc.

The traits of nymphs and female adults attract the sap of branches, leaves, and fruits. In severe cases, the leaves dry and shrink, weakening the tree and even causing death.

Morphological characteristics Adult female quill arrowhead, often slightly curved, 2-4mm long, dark brown to dark brown, gray edge. The tip of the nose is wide and the rear end is wide. The 1, 2 and 2 years old python shells are yellowish-brown at the front of the shell. The center of the shell has a prominent longitudinal ridge at the center of the shell. On both sides, there are many transverse stripes extending forward. Female adults are orange and about 2.5mm long. The male shell is long and narrow, 1.2-1.6mm long, pink and white cotton-like flocculent, with three longitudinal ridges on the back, and the first-instar eucalyptin shell is yellow-brown on the front end. Male adults are 0.5mm long, orange-yellow, with well-developed forewings, and specialization of hind wings for balance rods. Abdominal needles. Egg oval, 0.2mm long, orange yellow. The nymphs were insecurated with a shoe-shaped, orange-yellow, antennae, and well-developed feet. L at the end of the abdomen had a pair of long hairs; and the second-year-old flat ellipse, pale yellow, tentacles and feet disappeared.蛹 long, 1.4mm long, orange-yellow, sexual thorn prominent.

Life habits Gansu, Shaanxi, two generations of old, Hunan, Hubei, Sichuan, three generations, Fujian 3-4 generations, mainly winter female fertilization, a few nymphs winter. The age of first instar nymphs is roughly: 2 generations around the end of May, before and after the mid-August; 3 generations of the area are mid-to-late, mid-July, mid-September; 3-4 generations, mid-April, June In late July, early July, mid-September, and early December. Adult spawning period is long, up to 40 days, the egg period is short, only 1-3 hours, nymph period summer 30-35 days, more than 50 days in the fall. The number of single female eggs is 70-300, the third generation is the most, and the first generation is the second. The eggs are produced in the mother, and the newly hatched nymphs crawl out of the mother's shell and transfer to the branches, leaves, and fruits. There is parasitic, only 1-2 hours to fix the sap, the body gradually shortens, and the next day begins to secrete cotton floc wax. The 2nd-age antennae and feet disappeared, and they continued to grow and secrete a shell under the oyster shell, and the moltings became female adults. Male nymphs secrete cotton-like waxy shells after 1st instar, and often prefer clusters on the dorsal spurs. Natural enemies include Japan's hornbill, various ladybugs, and wasps.

Prevention methods (1) Strengthen comprehensive management, make air and light transmission good, enhance tree vigor, and increase resistance to pests and diseases. (2) Cut out severe sticks of locusts and put them on empty ground until the natural enemies fly out and burn them. It can also remove dense grasshoppers on branches. (3) Protecting predators. (4) Chemical control The best application of the nymphs in the spread and transfer period is the absence of wax powder and shells, and the weakest resistance. Available 40% Dimethoate 500-l000x or 50% Malathion EC 600-800x, 80% Dichlorvos 800x, 25% Phosphate or Insecticidal or 30% Phoxim, etc. Emulsifiable concentrate 400-600 times liquid, 50% of rice oil scattered 1500-2000 times. Mineral oil emulsion can also be used in summer and autumn with 0.5% oil, 3% in winter with a 5% or pine oil mixture 18-20 times in summer and autumn, 8-10 times in winter. For example, the combination of chemical pesticides and mineral oil emulsions has better effects, and it also has effects on the secretion of wax powder or wax shells. The ratio of rosin mixture is caustic soda 2: rosin 3: water 10.