Wheat is an important field crop in China. Starscream is a pest that is more harmful to wheat during wheat growth. This article will introduce the occurrence and control methods of wheat red spider in detail, and hope to help everyone grow wheat.
The symptoms of wheat spiders are: the spiders of the wheat spiders, the nymphs suck the wheat seedlings juice, the yellow and white spots of the damaged wheat leaves, the yellow leaves after the damaged wheat leaves, the yellow leaves of the plants are yellow, the plants grow badly, the plants cannot grow normally, and even dry. And die.
Occurrence characteristics: Mai long-legged spiders occur 3-4 generations a year, with adults and eggs overwintering in the soil. In March of the next year, the wintering adults begin to move, and the eggs also hatch, and enter the breeding and damage period from April to May. Adults in large quantities in the middle and late May are spawning in summer. In mid-October, the summer eggs will continue to hatch as a seedling, and it will take 24-26 days to complete a generation. Wheat spiders occur 2-3 generations a year, and winter, nymphs and eggs on wheat plants and weeds. From mid-to-late March to early April, the amount of insects was large, which was harmful. In late April, the insects subsided. The summer eggs began to hatch in October and became the autumn seedlings. Both wheat spiders are mainly parthenogenetic. The long-legged spiders of wheat are prone to drought, and the suitable temperature for survival is 15 °C-20 °C, and the optimum relative humidity is below 50%. During the daytime activities, it is the most popular at 3-4 pm. When it is rainy or dew, it is lurking in the wheat bushes and the soil. The wheat spiders are mostly active before 8-9 o'clock and after 4-5 o'clock in the afternoon. Not tolerant to drought, the suitable temperature for survival is 8 ° C - 15 ° C, suitable humidity is above 80%, and the wind is hidden in the lower part of the wheat bush. In the spring, adult eggs are produced on wheat tillers and clods, and in autumn they are mostly produced on fibrous roots and clods. The eggs are collected in piles, each pile contains more than 10 grains, and the water is poured into the wheat field, and the wheat field is heavier or densely planted. The long-legged spiders of wheat are heavy in the dry wheat fields.
Control methods: First, agricultural control. The use of crops for dumping, reasonable irrigation, and shallow tillage and mites after wheat harvest reduce the source of insects. The second is chemical control. After the wheat has returned to green, select the local heavier wheat field for investigation, take 5 points at random, check 33 cm per point, place white plastic cloth or water-filled pots, pat the wheat plants, record the number of fallen eggs, when the average is 33 When there are more than 200 larvae in centimeters, and 20% of the upper leaves have white spots, they should be treated with chemicals. Each acre can be sprayed with 1.8% avermectin 3000-5000 times or 50% malathion 1000 times. Or use 40% dimethoate EC 75g per acre and mix 20kg of fine soil to make toxic soil and sprinkle it in the field.
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