Rice paddy brown planthopper

The scientific name is Nilaparvata lugens (Stdl) Homoptera, Hidaeidae. The distribution ranges from Jilin in the north to Liaoning, Hebei, Shanxi, Shaanxi, Ningxia to Gansu, and from Gansu to Sichuan, Yunnan and Tibet.
Host rice.
Injury characteristics, nymphs clustered in the lower part of the rice bundles to suck juice; when the female eggs lay eggs, using an ovipositor to prick leaf sheath and leaves, easy to make rice strains lose water or infected sclerotia. Excreta are often caused by mold, affecting rice photosynthesis and respiration, and serious rice plants are dry. Commonly known as "eruption," "through the top" or "collapse." In severe cases, there are no particles.

Habits of life 12 to 13 generations of Hainan, the generation of overlapping generations of perennial breeding, no overwintering phenomenon. In Guangdong, Guangxi, and the south of Fujian, they are 8-9 years old, from March to May; 6-7 in the south of Guizhou, and from April to June; the middle and lower reaches of the Minjiang River, Guizhou, the middle and north of Fujian, and the 5-6th in the south of Zhejiang. , Moved from May to June; moved to the north of Jiangxi, Hubei, Hunan, Zhejiang, southeastern Sichuan, Jiangsu, Anhui, 4-5 generations, moved from mid-July to mid-July; northern Jiangsu, northern Anhui, and southern Shandong 2-3 On behalf of, moved from July to August; 35. The Other rice areas in the north of the area are 1 to 2 generations old, and were also moved in from July to August. The main insect sources in the vast rice region in China are moved and promoted from south to north with the damage and the summer warm-wet current. Each year, there are about 5 large-scale movements. In the fall, the team moves back to the south. 17 °C below the egg period 17 days, 23-24 °C 9 days, 27-30 °C 7

-8 days. Nymphs 24-26 °C duration of 15-16 days. Short-winged adults are residing, and long-winged are migratory. Shortly after emergence, it was able to fly strongly and could move with high altitude horizontal air currents. When flying northwards in the spring and summer, the flight altitude was 1500-2000m, and the air humidity was high to facilitate its migration. The initial flight temperature was about 18.2°C. Adults have obvious tropism toward green rice, and males can perform multiple matings. At 24-27°C, mating starts 2-3 days after emergence, and each female lays an average of 200-700 eggs. The average life expectancy of each generation during rice growth is 10-18. Days, field multiplication times 10 to 40 times per generation. The nymphs and nymphs prefer a damp and humid environment and prefer to inhabit rice plants within 10 cm of the water surface. When the number of insects in the field is higher than 0 or 4 per cluster, uneven distribution occurs, and the collapse phenomenon occurs in the field at the end of the period. At the late stage of rice growth, a large number of long-winged adults emerge and migrate out, and the 1-3 age is a critical period for wing-type differentiation. In recent years, due to the changes in farming systems in various rice regions in China, rice varieties are quite complex and have long maturation periods.

Wrong, in favor of the increase in the population of the worm, causing serious damage. The optimum temperature for the growth and development of this worm is 20-30°C, 26°C is optimal, and the Yangtze River valley is not hot during the summer. The higher temperature in late autumn is conducive to its occurrence. The season of brown locust migration is met with more rain, more rainfall, and landing. The occurrence of large-scale, cloudy and wet fields, partial production on the production, over-application of nitrogen fertilizer, rice seedlings dark green, high density and long-term irrigation of deep water, and its reproduction, the victim is heavy. The natural enemies include the rice blast wasp, brownback Trichogramma beetle, rice red beetle, rice silk beetle nematode, black-shouldered lucid plague and so on.

Prevention and control methods (1) Do a good job of forecasting and reporting, do a good job of analysis of migration trends, plan uniformly when planting, and rationally arrange and reduce the source of insects. (2) Strengthen the management of fertilizer and water in the field, prevent the greediness of the youth in the later period, properly grill the field, and reduce the humidity in the field. (3) Breeding and promotion of insect-resistant product varieties to prevent the emergence of new biotypes of brown planthoppers. For example, the Chinese hybrid rice variety Xiaoyou 6 suffered from mild damage in the brown planthopper biotype I area. In addition, Xiang Zao glaze No. 1, No. 3, Guang You Qing, Qi Gui Zao 25, Wei You 35, II You 46, D You 64, Wei You 64, Nanjing 14, Yang Dao No. 3, water source 290, may be selected according to local conditions. Xiushui 620 and other insect-resistant varieties. (4) Protect and use natural enemies. (5) In the peak period of nymph hatching until the 2-3th instar nymphs occur, 2,5% fluconazole WP or 25% fluconazole wettable powder can be sprayed in time. Early rice, early rice, and late rice fields are every 667m2 20- 30g, late in the rice field 50g, or 10% more than 50-100ml of suspension agent, can also be used 10% second pass net (imidacloprid) WP 2000 times

Liquid (667m2 medication 10-208 water 60kg), 1-30 days more than 90% control effect, duration of 30 days. In addition, with 80% insecticidal powder 35-408, the early control effect is better than that of leaf loquat, and it can also treat other pests. Promote the application of 20% Confodol Concentrate Solvent, 6-8ml per 667m2 or 40% inactivated bellflower oil 30-40g, 10% Dagongchen WP, and 667m2 with 2g of active ingredient to control rice planthoppers, concurrent treatment of leafhoppers Hummer. Can also be used 75% citric acid WP (Pesticide plus buprofezin) 650g/hm2 control of loquat, and treatment of Scutellariae, Saponin, rice leaf roller.

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