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Occurrence and Control of Wheat Leaf Bee
Chinese name: wheat leaf bee English name: wheat sawfly Chinese alias: Qi headworm, small armyworm, green cloth bag insects Latin name: wheat leaf bee (Dolerus tritici Chu) and barley leaf bee (Dolerus hordei Rhower) distribution area: the Yangtze River Northern wheat morphological characteristics: adult body length of 8 to 9.8 mm, male body is slightly smaller, black microstrip blue light, both sides of the back of the chest - white spots. Wing transparent membranous. The egg kidney is flat and yellowish with a smooth surface. The larvae were 5 instars in age, 8 mm in mature larvae, cylindrical in shape, thick in the chest, and thin in the abdomen. Each section of the thorax and abdomen had transverse ridges. The dragonfly is 9.8 mm long and is slightly smaller, yellowish to blackish. The belly is small and the ends are forked. Barley leaf bee, each insect is basically similar to the wheat leaf bee, only the adult has a black chest, and both sides of the shield are auburn. Damage crops: barley, wheat. Symptoms of damage: The wheat leaf bee damages the wheat leaves with larvae, and bites into the nicks from the edges of the leaves. In severe cases, all the tips of the leaves can be eaten. Classification properties: Hymenoptera, saw beetles Incidence characteristics: wheat leaf bee occurs in the northern wheat region one year in a row, wintering in a depth of 20 cm in the earth, after the temperature rises in March of the following year began to emerge, the adult sawtooth production The eggs are laid in the tissues next to the main veins of the leaves and laid in chains. A 2 cm long and 1 cm wide protrusion appeared on the leaf surface. 1 to 2 or 6 to 7 eggs per leaf. The egg period is 10 days. The larvae have a pseudo dead nature, 1 to 2. Injury leaves at the age of 3 years of age, and they are afraid of light after 3rd year of age. They fall into the wheat tussock during the day and damage later in the day. The food intake of the 4th instar larvae increases. When the density of the larvae is large, the leaves can be eaten. Generally, in mid-April, it enters the stage of damage. In mid-May, mature larvae entered the soil for dormancy until September and October. The temperature of wheat leaf bees is high in winter, the soil moisture is sufficient, and the temperature, temperature, and soil moisture in spring are appropriate to occur. Sandy soils are heavier than viscous soils. Control methods: Agricultural control: When deep plowing before planting wheat, the dormant larvae in the soil can be pulled out so that they can not normalize the earthworms, resulting in death. If there are conditions in areas where paddy-rice rotation is carried out, rice and wheat can be dumped to eliminate the damage. Chemical control: 7.5% trichlorfon powder 3-4 kg for each mu, sprayed in the morning and evening. Manual trapping: Take advantage of the false-dead habit of the larvae of the leaf beetle and catch them in the evening. Common pharmaceuticals: Trichlorfon beta-cypermethrin imidacloprid