Common names of wheat spiders are fire dragons, red spiders, and fire spiders. They belong to Arachnida and order Acarina. There are two types of red spiders that endanger wheat in our country: the long-legged spider and the wheat round spider. The suitable temperature of the wheat long-legged spider is 15~20℃, the suitable temperature of the wheat round spider is 8~15℃, and the suitable humidity is below 50%.

Wheat spiders suck leaf sap during the seedling stage of wheat. Many small white spots appeared on the injured leaves at first, and later the wheat leaves turned yellow. After the wheat plant is injured, the growth of the light plant is affected, the plant is dwarfed, and the yield is reduced, and the whole plant withered and died in the severe case. The damage period of wheat round spiders is at the jointing stage of wheat. If the wheat is damaged, if it is watered and fertilized in time, the damage degree can be significantly reduced. The peak period of wheat long-legged spider damage is from the booting to heading stage of wheat, and when it occurs, it can cause serious yield reduction.

Most of the red spider mites hide on the back of the leaves, and can spread widely in wheat fields through wind, rain, crawling, etc. When pests occur, there will be several obvious characteristics, namely: 1. Wheat spiders damage the upper leaves when the temperature is high at noon, damage the lower leaves in the morning and evening when the temperature is low, and lurk at the roots at night. 2. The central point and flakes occur, and then spread to the whole wheat field; 2. It spreads from the root of the plant to the middle and upper parts;

Chemical control

After the wheat turns green, when there are 200 insects in a single row of 33cm in the wheat ridge or 6 insects per plant, the control can be sprayed. The control method is mainly based on picking control, that is, where there are insect control, and key plots are focused on control, which can not only reduce the use of pesticides, reduce the cost of control, but also improve the control effect; the wheat gets up and jointing. After the temperature is higher, the spraying effect is the best before 10:00 and after 16:00.

After the spring wheat has turned green with chemical spraying, when the average number of insects per 33cm single ridge is more than 200, and there are white spots on 20% of the upper leaves, chemical control should be carried out. Abamectin, acetamiprid, bifenazate, etc., combined with pyraclostrobin, tebuconazole, brassin, potassium dihydrogen phosphate, etc. can be used to control red spiders, wheat aphids, and prevent wheat sheath blight , rust and powdery mildew can also promote the growth and development of wheat to achieve the purpose of increasing yield and high yield.