Wheat sowing prevention and control of scrub dwarf disease
Wheat bush dwarf disease, also known as slope-slip disease, is a devastating disease caused by poisoning by SBPH. Xinji City has annual degrees of occurrence of 1-20% of crops, and severe cases have a reduction in yield of 5 percent. Become more or even more. In particular, in the past two years, the incidence of wheat bush dwarf disease has increased year by year, and the outbreaks have become more severe. The dwarfing or yellowing of the diseased plants has become more serious in the places where the wheat fields near the ditch, doctrine, tree land, cotton fields, and leisure fields are 0.5-1 m wide. Dwarfing the leaves, I hope McDonald will pay attention.
First, the reasons for the rise of the disease mainly include the following aspects:
1. Planting layout results in many flowering fields, generally close to the ground, roadside, ditch, wells and other special environments and the incidence of wheat fields connected with the spring. The reason is due to the fact that there are many weeds in these environments, and there are many sources of virus insects and viruses. Moreover, due to the inconsistent farming operation time of the farmer households, it is beneficial to the habitat and avoidance of the planthoppers. After the emergence of wheat, the planthoppers can easily move from the forest farmland and surrounding areas into the hazard of wheat fields.
2. The fertility of the field is good. Extensive field farming results in a high density of weeds in the field, providing ample food sources and sites for wintering and summering for the fly.
3. The climatic conditions are suitable for the reproductive hazards of Laodelphax striatellus. Due to the high temperature in autumn and warm winter in winter, the rainfall is small, which is very beneficial to the overwintering of Laodelphax striatellus. It accumulates a large number of insect sources for the damage after winter.
4. Mechanical cross-region operations, on the one hand, caused an increase in grass weed species, and on the other hand, the number of grain falling in the field increased, resulting in a large number of self-producing wheat seedlings in the field, which provided a convenient condition for the endangered propagation and transmission of poisonous plants in the field.
Second, prevention and control measures: The principle of "prevention first, comprehensive prevention and control" is the principle. There are two peaks during the uploading of infections in wheat in Laodelphax striatellus: the first time wheat is sown and the second is after the return of wheat. Due to suitable temperature, Laodelphax striatus starts feeding on the wheat seedlings and spreads the virus. The sooner the infection appears, the earlier the disease will be, and the greater the impact on yield, so it is necessary to pay close attention to autumn prevention and control, and the autumn prevention effect is significantly higher than in spring.
1. Should be sowed in due time, avoid interplanting as much as possible, eradicate the weeds on the wheat fields, and eliminate poisonous insects breeding sites.
2. Chemical control methods: First, do a good job of seed dressing, the second is when the wheat seedlings 80% unearthed after the use of 30% acetophos 50 ml per acre plus 10% imidacloprid 20 grams, 30 kg of water on the field of wheat spray, It also focuses on special areas such as spurts, ravines, and wells, and sprays 1.5-2 meters of isolation zone on the spring ground next to spring land. The third is when the wheat has returned to green in the second year of the spring. When it is sunny at 11 o'clock in the afternoon and at 2 o'clock in the afternoon, it is sprayed with the above method and agent, and sprayed once every 7-10 days. , Swedish fly and other pests play a controlling role.
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