Wheat spiders are crickets that have four pairs of feet, unlike insects, which have three pairs of feet and no wings. It is a common pest of wheat. The wheat spider sucks the wheat sap, causing tiny yellow-white spots, which are smaller than the wormhole sucked by the locusts and generally do not cause necrosis. However, when the density is large, it can also cause plants to die or fail to head. At the time of the filming, the insect areas are often shorter than the surrounding healthy wheat, and they look like they were burned at a distance, so the wheat spiders are also commonly called fire spiders.
Wheat spiders are reddish-brown, also known as red spiders, and they are mainly wheat spiders and wheat legged spiders. The distinctive feature of the wheat leg spider is that the first pair is twice as long as the second pair. Wheat leg spiders occur frequently in the drylands in northern China and occur 3 to 4 generations a year. Spring is the main damage period. After the birth phase of wheat has been pushed back this year, we need to pay attention to the monitoring and prevention work in the later period.
The requirements of the two spiders on the environment are not the same, Mai long leg spider like drought, temperature 15 °C ~ 20 °C, while the wheat circle spider likes more rain and more humid and slightly lower temperature, 8 °C ~ 15 °C.
Wheat spiders can perform parthenogenetic reproduction, have a false death habits, and live in groups. Therefore, rainfall has an inhibitory effect on them, and in combination with irrigation and shaking, some wheat spiders can be drowned.
In addition, the removal of field weeds, especially grass weeds, can reduce the source of insects.
Chemical control of wheat spider mites can be used 15% fluorenone EC 2000-3000 times solution (20% broom NET wettable powder, 3000-4000 times solution), or 1.8% avermectin (Insulin g) 5000-6000 Times of fluid, 5% of methamphetamine-soluble granules 3-4 g per mu, or use of acetylene (Kytel), phenylhydrazine (West of Star), and dimethyl ether (Ze). If it is desired to cure other pests, agents such as fluvalinate, chlorpyrifos, and flufenoxuron may also be used.
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