Rice leafhopper with white wings

The scientific name ThaiarebiginosaKuoh was mistaken for Eryfhroneurasubrufa (Motsulsky) belonging to Homoptera, Cicadellidae. It is distributed to the south of the Yellow River and east of Xichang, Sichuan. Yunnan, Guizhou, some mountainous areas of Sichuan and Hanzhong of Shaanxi suffered heavily.

Host rice, @ # @ 245 rice, barley, sugar cane, English white, corn, rape, etc.

With the characteristics of damage, the nymphs sucked the sap of the leaves, and the damaged leaves appeared sporadic white spots at first, then connected into dotted stripes, or white stripes finally turned brown, affecting growth and development and 1000-grain weight.

Morphological characteristics: the length of female worm is 3.5-3.7mm, while that of male worm is slightly smaller. The head, chest and abdomen are orange. There are 1 semilunar leukoplakia on each side of the anterior edge of the head. There is a grayish yellow diamond-shaped spot in the center of the forechest dorsal plate and a small white spot on each side of the spot. The forewings are gray, translucent and iridescent, while the hind wings are light orange and more transparent than the forewings. The egg is 0.65mm, nearly bottle-shaped, slightly curved, pointed at one end and obtusely round at the other, milky white. The nymph is 5 years old. The last instar nymph is 2.4-3.2mm long, light yellowish green and has obvious setae on the body.

The living habits of Zhejiang, Anhui and Hunan are 3 generations a year, and then 3 Murray 6 generations in the south. Overwintering with adults in wheat fields, green manure fields and weeds sheltered from the wind and the sun. In the next spring, the overwintering adults first do harm to the wheat field. When the early rice emerges, it migrates and propagates, then spreads to the early rice Honda or the late rice field. When the late rice enters the harvest season, the worm migrates to the overwintering host again. Adults are lively and good at flying, and when disturbed, they dodge or fly elsewhere, while nymphs have poor jumping ability and walk sideways or roam when they are frightened. When the temperature was below 1 ℃, the adults mostly lurked in the soil crevice or the base of the plant, and began to move when the temperature was higher than 2 ℃. The average temperature was 21 ℃ 23 min, the egg duration was 15 mi 16 days, the nymph duration of the first and second generation was 17 mi 21 days, and the third generation 33 Mel 40 days. The longevity of adults is 20ml 30 days, and that of overwintering generation is 194 days. It likes to Eclosion in the morning and feeds on the upper leaves of the plant, which tends to tender green and phototaxis. Most of the eggs are laid in the cavity of the main vein of rice leaves during the day, in the first and second leaves of the base of rice plants at tillering stage, and mainly in the third leaf at heading stage. There are 3 eggs in each place and 5 in individual. Each female laid 60 eggs in overwintering generation, 55 in the first generation and 30 in the second generation. When the temperature is below 20 ℃, the relative humidity is 85% and 90%, the nymph is more dead, the life span is short, and the number of eggs laid decreases. In production, there are more Rain Water in May and June, the temperature is on the high side in August and September, and there is a certain rainfall, which may occur greatly. In the mixed planting area of double cropping and double cropping rice, the damage of second cropping late rice was heavy, and that of late maturing middle rice was the second. Early sowing and early transplanting rice is generally vulnerable in the early stage, partial application of nitrogen fertilizer, rice seedling growth exuberant insect population is large, the damage is heavy. The main natural enemies are @ # 255birds @, winged beetles, discolored ladybugs, a variety of spiders and so on.

Control methods (1) the seedling fields of early rice and late rice should be sprayed 5 days before seedling pulling, which has an obvious effect on reducing the number of insect population in the later stage. (2) Honda's control should be carried out timely according to the pest situation. See black-tailed leafhopper for the type and dosage of medicine.