How to control Liriomyza huidobrensis

Rice stalk miner scientific name Chlorops oryzae Matsumura Diptera, yellow leaf miner family. Alias rice stem fly, rice drill heart fly, twintail worm, etc. Distribution in Heilongjiang, Zhejiang, Jiangxi, Hunan, Hubei, Guangdong, Guangxi, Yunnan, Guizhou and other provinces.

Rice stalk miner host

For rice, wheat, wheat, bluegrass, barnyardgrass and so on.

Damage characteristics of rice stem miner

The larvae bore into the stems and damaged the heart leaves, growth points and young ears. There are oval or long holes in the heart leaves of seedling stage, which develop into longitudinal slits, causing the leaves to break, and the new leaves to twist or wither. The number of mulberry trees increased, the plant dwarfed, heading delayed, panicle small, grain increased. The young panicle formation stage suffers the short distorted white panicle, the panicle shape is incomplete or appears the white panicle. In recent years, the damage of this insect has shown an upward trend.

Morphological characteristics Adult body length 2.3-3mm, wing span 5-6mm, bright yellow body. Head, chest equal width, head back has a diamond-shaped black large class; compound eye large, dark brown; antenna 3, base segment yellow brown, second segment dark brown, third segment black expansion was circular plate shape, antenna awn yellow brown, nearly as long as antenna. There are 3 large black longitudinal spots on the back of chest, spindle-shaped abdomen, black-brown transverse bands on the front edge of each node on the back, and 1 black dot on each side of the back of the first node. Body ventral surface pale yellow. Wings transparent, veins brown. The feet are yellow-brown, and the ends of the nodes are dark black. Egg 0.7 - 1mm long, white, oblong. The last instar larva is about 6mm long, nearly spindle shaped, pale yellow white, tough and shiny epidermis. The tail split in two. Pupa 6mm long, light brown to yellow brown, with black spots on the tail is also divided into two fork.

Life Habits of Rice Stem Liriomyza

Fujian has 2-3 generations and Hunan, Hubei, Guizhou, Yunnan and Zhejiang have 3 generations. From the end of March to the first ten days of April of the following year, adults lay eggs on seedlings, hatch in the middle of April, and newly hatched larvae invade the heart leaves by moving down along the back of leaves until pupation in the middle of May, and emerge in June. The larvae of the second generation hatch in late June and early July, damaging rice at booting and heading stage. The second generation adults emerge irregularly, fly to sweet potato field after emergence, and lay eggs on the leaves of potato, autumn breeding, autumn vegetable and winter wheat early sowing from late September to October. The eggs are scattered, usually one leaf and one egg. The warm winter and cool summer climate is suitable for its occurrence. The daily average temperature is above 35℃, and the larval development is hindered. Too much dew, insufficient sunlight, humid environment, low field water temperature is harmful. Mountain areas above 3000m above sea level suffer more.

Pesticide control method of rice stem miner

(1)Single cropping rice and double cropping rice should not be planted in mountainous areas to inhibit the occurrence of rice. (2)Adopt the strategy of treating the first generation harshly, treating the second generation harshly and treating the seedling field skillfully. The damage of the first generation is serious and occurs regularly, and the peak period is also obvious, which is beneficial to control. When there are 3.5-4.5 insects per m2 in seedling field or 1-2 insects per 100 clusters in field or at the end of peak spawning period, there are 0.1 eggs per seedling in seedling field and 2 eggs per cluster in field, spraying 80% dichlorvos EC or 50% fenitrothion EC, 50ml per 667m2, 50kg water. To control larvae, spray 40% dimethoate EC 150- 200ml on 50kg water, or use 50% fenitrothion EC, 100ml per 667m2, 50kg water, and use 3% carbofuran granules, 2- 3kg per 7m2, mixed with 20kg fine soil. For the seedling field with egg mass, the seedling roots can be soaked in 250 times solution of 40% dimethoate EC for 1 minute, or 300 times solution of 50% fenitrothion EC or 1000 times solution of 36% acaricide EC. Soaking time should be determined according to the temperature, seedling variety and quality, so as to prevent phytotoxicity.