In recent years, the wheat bush dwarf disease has gradually recovered in various wheat fields. The common diseased plants in the land and the ground have almost no crops. Wheat bush dwarf disease is a viral disease caused by viruses, and Laodelphax striatellus is the main mediator of poisoning. Early and early elimination of Laodelphax striatellus is an effective measure to alleviate wheat bush dwarf disease. First, the cause 1. Due to the planting layout, there are many wheat fields and flowering fields, and the farmer's field operation time is not uniform among the farmers, which provides favorable conditions for the habitat of the planthoppers, which causes the migration of the planthoppers after the emergence of wheat. 2. With the increase of straw returning area (especially corn), combined with no-tillage techniques and extensive farming practices, the density of weeds in the field and surrounding areas is large, providing food sources and sites for overwintering and overheating in summer, causing worms. Increased sources and sources. 3. The climatic conditions are suitable for the propagation of the planthoppers Because of the high temperature in the autumn and the warm winter weather, and less snowfall, it is very beneficial to the overwintering of Laodelphax striatellus. It accumulates the source of insects for the winter hazards. In early spring, the temperature is high, and the return of wheat to early spring is conducive to emergence of adult overwintering, which is a serious hazard to wheat fields. 4. On the one hand, mechanical cross-district operations caused an increase in the number of weed species in the grass. On the other hand, due to the different varieties and maturation time of wheat in various regions, the number of grain falling in the field at the time of harvest was large, resulting in a large number of spontaneous wheat seedlings in the field and the effect of herbicides. It is not ideal, which provides a convenient condition for the endangered propagation and transmission of poison in the field. Second, prevention and control measures Since the effect of autumn prevention and control is obvious in other seasons, it is necessary to pay close attention to autumn pest control. For a small piece of flat-cast wheat field, when the emergence rate reaches 50%, spraying 40% omethoate every 7 days or so at sunny noon can effectively control the activities of Laodelphax striatellus and prevent or reduce the wheat clumps. The occurrence of dwarfism. Also, 10% imidacloprid 10g plus 4.5% beta-cypermethrin may be sprayed on the water and sprayed every 5-7 days to fight for the elimination of Laodelphax striatellus before wintering. This can also be used for migratory locusts, leafhoppers, and swans. Earthworms, cockroaches and other pests play a controlling role. In addition, we can also prevent grassy dwarf disease by removing weeds in the field, eradicating the source of poisoning, using wheat as a flat crop, rational planting, avoiding intercropping with grasses, planting crops in due course, and appropriately delaying sowing time. Blood Collection Needle,disposable blood collecting needle,retraction type blood collection needle Shandong Zhushi Pharmaceutical Group Co.,LTD , https://www.sdzs-medical.com
Prevention of wheat bush dwarf disease before winter