There are two kinds of wheat spiders: wheat garden spiders and wheat leg spiders. The wheat spider spends winters as adults and eggs, hatching eggs in early March and is the first generation. The average daily temperature of 8-15 degrees Celsius is most suitable for reproduction, and it is higher than 15 degrees C (about the end of April). In October, the eggs hatched during the summer and they breed for two generations and they lay their eggs for the winter. The period of endangerment is from late March to early May. It mostly occurs in dry wheat fields in the plains and mountains. According to the survey on the plant protection and phytosanitary inspection at the Guantao County on February 23, the average number of wheat spiders per 23 cm was 236.6, and the control index of 100 wheat spiders per 30 cm was exceeded. 28.6% higher. According to the information provided by the meteorological department, rainfall from March to May this year is expected to be slightly less than normal, with warm winters and little rain, wheat fields and droughts are very suitable for the development of wheat spiders. Monitoring should be strengthened everywhere to eradicate wheat spiders in the early stages of damage.
The following methods can be used for prevention and control.
One is watering and disinfestation, that is, when the water is poured, the furrows will be mixed and the wheat strains will be swept up with a broom or bamboo pole to make the insects die and die from the mud.
The second is the control of chemicals, which is 1000 times liquid with dimethoate or omethoate, 1000-1500 times with 50% monocrotophos, and 1000 times with D-M mixture.
The following methods can be used for prevention and control.
One is watering and disinfestation, that is, when the water is poured, the furrows will be mixed and the wheat strains will be swept up with a broom or bamboo pole to make the insects die and die from the mud.
The second is the control of chemicals, which is 1000 times liquid with dimethoate or omethoate, 1000-1500 times with 50% monocrotophos, and 1000 times with D-M mixture.
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