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There are two types of wheat spiders: wheat garden spiders and wheat long-legged spiders. Wheat spiders overwinter with adults and eggs, and hatch over winter eggs in early March, the first generation. The average daily temperature of 8-15 °C is most suitable for breeding, and higher than 15 °C (about the end of April), the summer of the eggs. In October, the summer eggs hatch, breed for two generations, and lay eggs for winter. The prevalence period is from late March to early May, and occurs mostly in dryland and mountainous dryland wheat fields. According to the survey on the wheat field in the two villages of Guantao County on February 23, the average number of wheat spiders per head was 306.6 per 30 cm, which exceeded the control index of 100 heads per 100 cm. 28.6% higher. According to the information provided by the meteorological department, it is expected that the rainfall in March-May this year will be slightly less than normal. The winter warm and dry, the wheat field drought is very suitable for the development of wheat spiders. All localities should strengthen surveillance and eliminate the spiders in the early stage of the damage.
The following methods can be adopted for prevention and control.
The first is to water the pests, that is, to stir the furrows when watering, sweep the wheat plants with a broom or bamboo poles, and let the insects fall to the ground and die.
The second is chemical control, using dimethoate or omethoate 1000 times solution, 50% monocrotophos 1000-1500 times solution, D-M mixture 1000 times solution spray.
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