How to prevent rice leaf roller

Rice leaf roller is mainly harmful to rice. The larvae reel the leaves of the larvae to form adult worms. The larvae hide in the larvae and feed on the upper epidermis and mesophyll tissues, leaving the epidermis behind, resulting in white leaves. The heavy rice fields infested by the victims were bleak and resulted in serious production cuts. The newly hatched larvae climbed to the tip of the leaf at the age of 1st, and the leaf edge of the tip or tip of the leaf was spit-enveloped, that is, the "leaflet stage"; the 3rd instar larvae longitudinally rolled leaves, forming a clear white leaf; after 3rd instar food intake. Increased, insects increased; entered the 4-5 age frequent switching hazards, the victim leaves was dry white. The entire rice field is full of white leaves.

Rice leaf roller is a long-distance migratory pest that occurs from 1 to 11 generations from north to south. For example, in Hebei and Shandong, it is 2-3 generations in the north; Henan Xinyang, in the middle and lower reaches of the Yangtze River such as Hubei, Anhui, Jiangsu, Shanghai and northern Zhejiang are 4-5 generations; Hunan, Jiangxi, and southern Zhejiang are 5-6 generations; Fujian, Guangdong, Guangxi is 6-7 generations; Lingshui County, Hainan Province is 10-11 generations. It mainly harms grassy weeds in rice and wet areas. The warm and rainy climatic conditions are conducive to the occurrence of rice leaf roller.

Control methods: (1) rice leaf roller control in the hatching period of eggs. Use 1.8% of Blueberry Abamectin 75-100ml or 2% Triton Abamectin 70-100ml singles per acre, or 5% Hibium Emamectin Benzoate Soluble Granules 25 grams/mu, at least two barrels of water (30 pounds/barrel) for one mu of land, then sprayed once every 10 days. (2) Spraying medicine in the evening, the efficacy will be better.

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