Wheat bush dwarf disease is a wheat virus disease caused by the poisoning of Laodelphax striatellus. It is also called a sitting disease. The incidence is light, and there are intermittent short and fine yellow-white or yellowish stripes between the veins. The plants are short, the leaves are yellow, the leaves are thin and needle-like, and the tillers are increased without heading. The effect on the yield is greater, and the earlier the disease, the heavier the loss. Pesticide control is necessary to recover losses in a timely manner. Trunnion Valve Balls,True Union Ball Valve,Three Way Ball Valve,Ball Valve Shut Off WENZHOU ZHENHONG VALVE BALL CO., LTD , https://www.zhvalveball.com
In March, wheat entered the regreening period. Due to changes in farming systems and climatic conditions, the area of ​​wheat bush dwarf disease increased year by year in the past two years, showing that it is 0.5 to 1 m near the roads of roads, ditches, trees, cotton fields and idle land. Wide-ranging dwarfing plants or dwarfing of yellow leaves, the main reasons for the rise of wheat bush dwarf disease are as follows:
First, the fertility is good, and the extensive tillage in the field causes the density of weeds in the field to be large, providing ample food source and wintering and summering places for the gray planthopper.
Second, the planting layout has resulted in many flower arrangement fields, and the farmland operation time of each farmer is not uniform, which is conducive to the habitat and avoidance of the gray planthopper. After the emergence of wheat, the gray planthopper is easy to move into the wheat field from neighboring fields and surrounding areas.
Third, the climatic conditions are suitable for the breeding hazards of the gray planthopper. The gray planthoppers occur in the same place in our country for 5 generations. The fourth generation and the wintering generation are more harmful to wheat. In September, there was a large rainfall. The large planting area was used, the wheat was planted early, and the fourth generation of the gray planthopper. The adult activity period meets the wheat seedling susceptibility period, and the field poisonous source is heavy. The temperature is high in autumn and winter last year, and the rain and snow are less. It is very beneficial to the wintering of the gray planthopper. It accumulates the insect source for the winter damage, and should pay attention to the early spring pest control. Treating diseases.
Control measures Remove weeds. Remove weeds in the fields, fields, roadsides and ditch before and after returning to green, reducing insect sources and sources.
2. Chemical control. Since the damage of wheat planthopper to wheat is mainly at two peak periods, that is, after the emergence of autumn and the return of wheat in spring, it is necessary to grasp the word “early†in the prevention and control of pesticides, that is, the choice of windless and sunny weather in the early stage of wheat returning to green, for each sprayer. 10% of imidacloprid 10g is added to 4.5% of beta-cypermethrin 30ml sprayed wheat field and surrounding field stalks. China Pesticide Network also recommends using 40% omethoate spray per spray of 30ml, when the number of gray planthoppers is large (more than per square meter) At the 10th time, 1.5% phytophthora II or 20% virus A should be added to prevent diseases and improve the control effect.