There are 7 kinds of mites in corn. Tetranychus truncatus is the dominant species of Tetranychus urticae in Xinjiang. Tetranychus turkestani and Tetranychus cinnabarinus are common in corn fields in northern Xinjiang. Agropyron cristatum and red mite are common in corn fields in southern Xinjiang, and their harm is also serious. Tetranychus tenuipes and Tetranychus maydis are newly recorded species in Xinjiang.
Prevention and control countermeasures
1. Strengthen organizational leadership, formulate effective prevention and control plans, establish and improve relevant management systems, and pay close attention to the implementation of key measures.
2. Carry out technical training, publicize and popularize the knowledge of the occurrence and harm characteristics and control measures of Tetranychus urticae, improve the scientific and technological quality and comprehensive control awareness of employees, and ensure the spraying quality and control effect.
3. Take the countermeasures of regional comprehensive management. In order to control Tetranychus urticae, we must pay attention to the occurrence and effective control of Tetranychus urticae in other crops such as gardens, orchards, beans and cotton.
4. Strengthen comprehensive prevention and control. Dig deep into the land, irrigate in early spring or after autumn, remove weeds in furrows and ditches, unify indoor flowers to kill aphids and mites, and reduce overwintering; Strengthen the water management of corn, irrigate reasonably and timely, and improve the field microclimate.
5. Do a good job of sealing around the site and site prevention. Strengthen investigation, find out early, and block the periphery of the field uniformly to prevent the insect source from transferring to the corn field; When it is found that tetranychus urticae has moved into the corn field, it is necessary to "seal" the central plant and the corn field, cut off the source of its further spread, and control tetranychus urticae in the stage of spot occurrence.
6. Choose soft or biological pesticides for scientific control. Choose pesticides that are safe for natural enemies and compatible with the environment, and protect and utilize natural enemies, such as 5% nisolone 1000 ~ 2000 times solution, 1.8% aifuding 1 EC 1500 ~ 2000 times solution or1. Pay attention to alternate use of chemicals to delay the drug resistance of Tetranychus urticae. In addition, the mixture of 40% dimethoate emulsion and 20% dicofol (1: 1) is 1000 ~ 1500 times, which can kill adult mites and eggs with long control time and good effect.