In recent years, the wheat spider's overwintering base has increased year by year, coupled with its small body size, easily overlooked, and gradually rising from the secondary pest to the main pest. It pierced and sucked the wheat leaf juice with a sucking mouthpart, resulting in a needle-like white spot on the victim's wheat leaf, yellowing of the wheat leaf, malnutrition of the wheat plant, and dwarfism of the plant. When the disease was severe, the entire leaf became pale and gradually yellowed. Withered, dead, resulting in reduced production.
Wheat spiders are divided into wheat spiders and wheat legged spiders. The main threat to wheat in our province is wheat leg spiders, and some areas are mixed hazards. Wheat legged spiders are born 3-4 generations old, adults and eggs overwheat in soil under the clods of the wheat, earthworms in the winter, the following year in February-February adults began to breed, overwinter eggs began to hatch, the amount of field insects in April-May, and more, May After mid-late and late summer, the adult lays eggs. The eggs hatch in the summer and early mid-October. Therefore, wheat long-legged spiders are endangered during the booting period of wheat to the beginning of the heading period. If the control is not timely, it will cause wheat to fail to stand and die. Wheat legged spiders like to live in a dry environment, with severe drought and drought years and regions.
Prevention
When there are more than 200 wheat spiders per line of wheat, more than 10% of the white spots on the leaves of most of the wheat leaves, and when white spots begin to form a piece, or when 20% of the upper leaves have white spots, should be promptly carried out Chemical control.
Clean the field weeds. Use 20% of dicofol EC 800 times, or 20% SCWP 2000-3000 times, or 1.8% avermectin EC 4000-5000X, or 15% DF 2000-3000 times Liquid spray, pay attention to add enough water spray, so that the liquid into the roots of wheat seedlings. 50% sulfur suspension agent can also be used with 200-400 grams of water 50-75 kilograms of spray, which can effectively control wheat spiders, but also both powdery mildew and rust.
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