The pictures and control methods of rice straw stalk flies and insects, rice stalks are distributed in the southwest, south China, and the middle and lower reaches of the Yangtze River. In the past, it was a secondary pest, but in recent years, the rice areas in Sichuan, Chongqing, Guizhou, Zhejiang, Jiangsu and other places have shown a rapid upward trend, especially in areas with cool climates such as mountains and hills, which have been catastrophic, and the severity of damage in some areas. Even more than aphids and rice leaf roller.
Characteristics of rice paddy larvae
It is harmful to the heart, leaves, growth points and young ears of larvae. In the seedling stage, the heart leaves have elliptical or long-shaped small holes, and then develop into long slits, causing the leaves to break, and the new leaves are distorted or withered. The affected plants increased in tillering, the plants were dwarfed, the heading was delayed, the ear was small, and the gluten increased. Short white ears are distorted during the formation of young panicles, and the panicles are incomplete or appear white spikes.
Morphological characteristics of rice paddy
Adult body is bright yellow; head, chest and other width, 1 diamond-shaped black large spot on the back of the head; complex eyes large, dark brown; tentacles 3 knots, base section yellow-brown, section 2 dark brown, section 3 black swelling Round plate shape, nearly as long as the antennae; three black longitudinal spots on the back of the chest; abdomen spindle shape, the front edge of each section has a dark brown horizontal band, and the first side of the first section has 1 black dot on each side; Light yellow; wing is transparent, wing veins brown. Egg white, long oval. The larvae of the last instar are nearly spindle-shaped, light yellow-white, the skin is strong and shiny, and the tail ends are divided into two forks. It is light yellowish brown to yellowish brown with black spots on the top and two ends on the tail.
Occurrence regularity of rice paddy
The southwestern region and the middle and lower reaches of the Yangtze River occur three generations a year, and the larvae overwinter on the hosts such as Mai Niang, Yucao, Baotou, and Mai. Overwintering adults appeared in early spring in April, and then flew to Putian and Honda to lay eggs. The first generation of larvae was the peak period from late May to early June. The middle and late June was the peak of pupation, and late June. In early July, it was the peak of feathering and the peak of spawning. From the beginning of July to the middle of August, it is the peak period of the second generation larvae, and it is the peak of feathering from late September to mid-October. Most of the adults after emergence are concentrated on the overwintering hosts to lay eggs, and the larvae immediately penetrate into the heart leaves and enter the wintering state. The hatching of rice stalk eggs and the invasion of larvae are related to precipitation and humidity. The hatching rate and larval invasion rate of the eggs in the rainy days are high, and the occurrence and damage are heavier. The mountains and hills where the temperature is cool are heavy. Fields with high planting density are heavier than planting density. The amount of nitrogen fertilizer applied is large, and the rice grows green and the field is high, and the rate of egg production is high.
Rice straw migratory fly control method
Single-season rice and double-season mixed-planting mountainous areas should try not to grow single-season rice, which can inhibit the occurrence. Before the emergence of wintering larvae, the weeds in the field and the surrounding weeds should be removed in time to deteriorate the wintering environment of the insects, which can lower the number of insects in the current year; properly adjust the rice sowing period or select the appropriate varieties in the growing period to avoid the peak of adult spawning Selection of insect-resistant varieties; reasonable close planting, no partial application, late application of nitrogen fertilizer, formula fertilization, so that rice growth is robust.
For the poultry with egg mass, dip the root with a 40% dimethoate 250 times solution for 1 minute, or dip the root with 50% chlorpyrifos EC 300 times. The time of dipping should be determined according to the temperature, seedling variety and quality at the time to prevent phytotoxicity. Adopting the rule of the rule of the rule, the second generation, and the strategy of treating the field. The first generation is harmful and tidy, and the peak period is also obvious, which is beneficial to prevention and control. The adult germination period and egg incubation period are suitable for prevention and control. When there are 3.5 to 4.5 worms per square meter in Putian or 1 or 2 worms per 100 groves in Honda or the end of spawning period, the average seedling of Putian has 0.1 eggs per seedling. Granules, Honda started on average with 2 eggs per plexus, and controlled adult insects to spray 80% dichlorvos emulsifiable concentrate or 50% chlorpyrifos EC 50ml/mu 50kg water.
The following agents are used to control larvae: 40% dimethoate 150-200ml/mu; 50% chlorpyrifos emulsifiable concentrate 100ml/mu; 48% chlorpyrifos emulsifiable concentrate 75ml/mu; 1% avermectin emulsifiable concentrate 12.5ml/mu; 20% Sulfur Kebuwei emulsifiable concentrate 50ml/mu 50kg of water, evenly sprayed; Putian can use 3% chlorine whale granules 2 to 3kg/mu, mix fine soil 20kg.
This article URL: pictures and control methods of rice straw stalk fly pests and diseases
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