Alfalfa is the main pest of cotton. Damage to cotton seedlings can cause headless seedlings, long seedlings, or broken leaf madness, affecting the whole seedlings and strong seedlings of cotton. The occurrence of this year's generation of L. lucidum is characterized by a normal occurrence period, a moderate amount of occurrence, and an emphasis on local areas.
First, pest situation analysis
On April 12th, in Sanyu County, 17 fields of main fields were surveyed outside the fields of broad bean and wheat, with an average of 0.002 (0-0.3) heads per pot, of which 0.03 heads (0-0.3) were in the broad bean field. It was not seized on other hosts. On April 17, 10 fields of broad bean fields were surveyed in the Sanyu area, with an average of 0.09 (0-0.3) heads per worm. On the same day, 44 heads of nymphs were identified. The second instar accounted for 65.91% and the third instar accounted for 35.10%.
According to the main host insect population and nymph development progress, combined with the current climate and other factors comprehensive analysis: It is expected that the peak period of the generation 2 and 3 nymphs of the first generation of Lumbunchi will be around April 19, the occurrence period is normal, the occurrence is medium, and the local area is heavy.
Second, prevention advice
In view of the occurrence characteristics of a generation of blind stink bugs, prevention and control strategies combining "injection outside the bed and fumigation inside the bed" should be adopted.
1. Spray protection outside the bed: According to the analysis of the census, the amount of insects in the broad bean field of cottonseed meal is relatively high. All localities should focus on the prevention and control of insecticides in the fields such as cottonseed bean field and near-bed seed weeds. The first medication was taken before and after April 19, and the medicament can be treated with 40% acephate EC 100 ml/mu or 40% phoxim EC 80-100 ml/mu, and watered with 40-50 kg of spray to control the amount of insects. The higher plots were treated for the second time every 5-7 days.
2. In-bed fumigation or spraying insecticide: When the cotton uncovers the sun drying bed, every 21 meters long seedbed is filled with 80% dichlorvos 5 ml 150 ml water, 2 kg dry fine soil, evenly scattered at 3-4 pm Bed cover film overnight.
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