Cotton leafhopper

Scientific name Tettigella viridis (Linnaeus) Homoptera, Leafhopper family. Alias ​​greenleaf fleas, green leafhoppers, large green dust and other dust. Distributed throughout the country.

There are 160 species of plants such as cotton, millet, corn, rice, soybeans, potatoes, vegetables, and fruit trees.

Injurious features and nymphs damage the leaves, sucking juice, causing discoloration, deformity, curling, and even whole leaf withered. In addition, viral diseases can also be transmitted.

Morphological characteristics Adult body length 7-10mm, slightly smaller than the female, blue-green. The head is orange-yellow, with 1 small black spot on each side, 2 monoculars, red, and 2 polygonal black spots between the single eyes. The fore-wing leathery green microstrip is cyan, and the end color is light and translucent; the foreface is reversed, the hind wings and the ventral back are black, and the abdomen is both orange and yellow on both sides and ventral. Yellow, white and orange yellow, fiscal section 3. Eggs are oval in shape, slightly curved, with a pointed end, approximately 1.6 mm long, and milky to yellow-white. Nymphs are similar to adults and total 5 instars. The first-year-old gray-white; 2 years light gray microstrip yellow-green; 3 instar yellow-green, chest and abdomen on the back of 4 brown vertical lines, the emergence of wing buds; 4 and 5 years of age with 3 years old, body length 6-8mm.

Habits of life Three generations in the north of the year, wintering under the skin of the branches of eggs. Incubation in April, weeding on weeds, crops and vegetables, 30-50 days of the nymph period, the first generation of adult emergence period is from late May to early July. The generation period of each generation is roughly as follows: the first generation from early April to early July, and the adult appearing from late May; the second generation from early June to mid-August; the adult appears from July; the third generation from July to mid-July 11 In mid-month, adults began to appear in September. Irregularities occur and generations overlap. Adult phototaxis, strong summer, late autumn is not obvious, may be due to low temperature. Adults and nymphs can feed on day and night, spawn in host plant stalks, petioles, main veins, shoots and other tissues. The ovipositor pricks the epidermis into crescent-shaped wounds and spawns 6-12 eggs in it. Neatly, the epidermis of the spawning plant has a kidney-shaped bulge. Each female can produce 30 to 70 eggs, non-overwintering eggs 9 to 15 days, overwintering eggs for more than 5 months. In the early period, mainly crops, vegetables, weeds, etc., were planted. By September and October, crops were successively harvested and weeds were withered. They were then concentrated on autumn plants, winter wheat, and other green plants. In mid-October, the third generation of adults migrated to fruit trees. The trees are damaging and spawning in the branches. In late October, the spawning period will occur. After autumn, the eggs will be overwintering.

Prevention methods (1) Summer light traps and kills the second generation of adults, reducing the occurrence of the third generation. (2) When nymphs and nymphs are concentrated on millet plants such as millet, 2.5% trichlorfon powder or 1.5% powdered 1605 powder, and 2% powdered leaf powder (Isoprocarb) powder should be sprayed in a timely manner every 667m2kg. (3) When necessary, it can spray 2.5% of Baoyou EC 2000-3000 times or 10% of Da Gongchen WP 3000-4000 times.