June 25 to 26 of 2019, Prof. Pan Wenliang and Prof. Li Yaofa went to the cotton planting areas of Quzhou County, Qiuxian County and weixian County conducting technical guidance on pest control in cotton bud stage.
At present, aphids are the main pests in the cotton fields of this region. The high resistance of cotton aphid to chemicals combining with the weather condition makes the aphid population higher than that in previous years. The survey found that the quantity of cotton aphids in most fields reached to 300-2000 heads per one hundred three-leave plants and several plots even higher than 30,000 heads. If the weather conditions are suitable, the summer ecotype may become a disaster. The observation also showed that thrips in some cotton fields were heavier, causing certain damage to cotton plants, and owing to less rain in the period, cotton diseases were slight.
In response to the above investigations, Professor Pan Wenliang suggested that the Agricultural Administration Department of Southern Hebei Cotton Region should monitor the dynamics of cotton aphid population and provide in-time guidance on field control.