Wheat leaf bee, also known as Qi head worm, small armyworm, green cloth bag insects. The damage is characterized by eating larvae and eating wheat leaves, causing nicks and even eating light leaves. Morphological characteristics, adults are bees, larvae are meat worms, gray-brown.
Occurrence pattern: The wheat leaf bee occurs in the northern wheat region one year in a row. The beak spends winter at a depth of 20 cm in the earth. After the temperature rises in March of the following year, it begins to emerge. The adult eggs are produced by the saw-shaped egg-laying device next to the main vein of the leaf. In the organization, a series of production. 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 feign death, 1-2 instar leaves, after the 3rd instar, they are afraid of light, during the day they are in the wheat tussle, and later in the afternoon, the 4th instar larvae increase their food intake. When the density of the larvae is large, they can eat the leaves, generally 4 In the middle of the month, it enters the height of its destruction. In mid-May, mature larvae entered the soil for dormancy until September and October. The temperature of wheat leaf bees in winter is high, the soil moisture is sufficient, the temperature in spring is high, and the soil moisture is large enough to occur. Sandy soils are heavier than viscous soils.
Control methods: First, agricultural control. When deep plowing is done before planting wheat, the dormant larvae in the soil can be pulled out so that they can not normalize the pupae, resulting in death. In areas where conditions permit, plowing rice and wheat can be used to eliminate the damage. The second is chemical methods. Only by mastering prevention and control indexes for prevention and control can we achieve better economic benefits. The control index of wheat leaf beet is 30 heads per square meter. The control drug can be selected as Lambda-cyhalothrin EC or Chlorpyrifos EC, 40-50 grams per mu, watered 40-50 kg spray control.
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