Scientific name Chlorops oryzae Matsumura Diptera, yellow leaf miner. Alias ​​rice stalk fly, rice fly borer, double-tailed worm and so on. Distributed in Heilongjiang, Zhejiang, Jiangxi, Hunan, Hubei, Guangdong, Guangxi, Yunnan, Guizhou and other provinces.
Host rice, wheat, aunt, bluegrass, valerian and so on.
The traits of damage are larvae that invade the stem and damage the heart, growth points and young ears. There are oval or elongated holes in the heart that grow from the seedlings and then grow into longitudinal strips, causing the leaves to break and the new leaves to distort or wither. Affected strains have more mulberry saplings, dwarfing plants, delayed heading, smaller spikes, and increased glutinous rice. In the period of juvenile ear formation, distorted short white spikes appeared, and the ear shape was incomplete or flowering white ears appeared. In recent years, the insect damage has been on the rise.
Morphological characteristics Adult body length 2.3-3mm, wingspan 5-6mm, fresh body yellow. The head and chest are equal in width. There is a diamond-shaped black large class on the back of the head; compound eyes are large and dark brown; tentacles are 3 knots, and the base section is tan-brown, the second section is dark brown, and the third section is black with a round plate shape and tentacles. Yellow-brown, nearly as long as the antennae. On the back of the chest, there are 3 large black horizontal stripes, abdomen spindle-shaped, with dark brown bands on the front edge of each section, and 1 black dot on each side of the back of the first section. Body belly pale yellow. Transparent wings, wings veins brown. Feet yellow-brown, dark black end of the fiscal year. Egg length 0.7-lmm, white, long oval. The final larvae have a body length of about 6mm, nearly spindle-shaped, pale yellowish-white, and strong and shiny epidermis. The end is divided into two forks. The dragonfly is 6mm long, pale yellow-brown to yellow-brown, with dark spots on it, and the end is also bifurcated.
Life habits 2-3 generations in Fujian, Hunan, Hubei, Guizhou, Yunnan, Zhejiang and other places in 3 generations. At the end of March and early April of the following year in Xinning County of Hunan Province, adults laid their eggs on seedlings and hatched in mid-April. The newly hatched larvae moved along the back of leaves and invaded the leaves and damaged them until the middle of May, and they emerged in June. . The second-generation larvae hatch in late June and early July, and damage rice in the booting and heading stages. The emergence of the second generation of adults is not neat, after the emergence of fly to the sweet potato field, in late October and October to the potato, autumn, autumn vegetables, Aegilous australis and early sowing winter wheat leaves lay eggs. Spawning eggs, generally one leaf and one egg. The warm climate in winter and cool summer occurs. The average daily temperature is above 35°C, and the development of larvae is hindered. Dew, lack of sunlight, humid environment, and low temperature in the field are serious problems. In mountainous regions above 3000m, the damage is heavier.
Pesticide control methods (1) Single-season rice in single-season rice and double-season rice mixed-cultivation mountain areas should not be planted as far as possible, and the amount of occurrence can be suppressed. (2) Adopt the strategy of ruling the generation, picking the second generation, and skillfully managing Putian. Generations are troublesome and neat, prosperous periods are obvious and beneficial to prevention and control. The period of adult emergence and egg hatching are suitable for prevention and control. When Putian has 3.5 to 4.5 insects per m2 or Honda has 1 to 2 insects per 100 clusters or at the end of spawning season, the average number of eggs per plant in Putian is 0.1. Honda averaged 2 eggs per bundle and began to control adult insects spraying 80% dichlorvos EC or 50% killer pine EC, 50ml per 667m2, and 50kg water. Control larvae with 40% Dimethoate EC 150-200ml water 50kg spray, can also be used 50% of the killing pine Loquat EC, 100ml per 667m2 medication, water 50kg; Putian available 3% Carbofuran granules, each 7m2 2-3kg , Mix 20kg of fine soil. For paddy field with egg mass, 40% Dimethoate EC can be used to dip root for 1 minute, and 50% can also be used to dip the roots with 300 times of Locust Chinensis EC or 36% of Locust Chrysanthemum EC. Dipping time should be determined after the first test according to the temperature, seedling varieties and quality at the time to prevent phytotoxicity.
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