Agricultural control technology for pollution-free amaranth diseases and insect pests

Due to the suitable cultivation of leeks and the suitable environmental conditions in the greenhouse, the occurrence of amaranth pests and diseases is increasing year by year (such as cockroaches, gray mold, disease, etc.), and conventional control methods often adopt chemical control methods, especially for difficult to control cockroaches. The prevention and control of the abuse of highly toxic, highly toxic and highly residual pesticides is widespread, and the results not only lead to increased resistance to pests and diseases, reduced yield and quality of leeks, but also buried hidden dangers of eating. After research and practice, a set of technical measures for the prevention and control of pollution-free amaranth pests and diseases were summarized for reference.
Selecting resistant varieties to select high-yield and more resistant amaranth varieties can be flexibly selected according to local conditions.
The pests and diseases caused by the rotation of leeks, garlic and leeks are similar, and they are easy to infect each other. Therefore, when leeks are planted or transplanted, if the stalks are onions and garlic vegetables, the underground pests are especially licking, and at the same time Accumulation of bacterial sources, aggravation of disease occurrence, will inevitably lead to low emergence of amaranth and poor growth potential. Therefore, as far as possible, the leek (including onions, garlic) and other vegetables should be rotated, and the rotation period should be more than 3 years.
Careful soil preparation and rhizosphere soil are not resistant to waterlogging, so the ground preparation requires flat ground to avoid low-lying water in the rhizosphere. Completely open field leeks, combined with the physiological characteristics of leeks and fertilizer management, cultivating 1~2 cm of fine sand in the roots of leeks 1~2 times, can increase the height of radish "root white" by more than 0.5 cm, and prevent adult mites. Spawn in the soil of the leek roots. The protected shed leeks are usually covered with soil once before the shed.
In the spring and autumn, the larvae were flooded and inundated for 2~3 days in the spring and autumn. The sheds were sown in winter and spring irrigation in late November and early March. If a serious field occurs, the amount of irrigation should be submerged in the ridge, which can significantly reduce the damage. If combined with medication during irrigation, the effect is better.
Reasonable fertilization of leek is a favorite fertilizer crop. However, if a large amount of fertilizer is applied, it will cause a slight increase in the resistance to disease. Therefore, fertilization should be based on the application of high-quality decomposed organic manure, cake fertilizer or biological bacterial fertilizer, supplemented by chemical fertilizers. When applying chemical fertilizers, nitrogen, phosphorus and potassium compound fertilizers should be applied, and trace element fertilizers should be applied to cultivate strong roots. In order to improve the ability of the plant to resist pests and diseases and increase the commerciality.
The prevalence condition for cleaning pasture and gray disease is high humidity and low temperature. Therefore, the cultivation of arch shed should be strengthened, ventilation should be timely, and temperature and humidity should be strictly controlled to keep warm and reduce humidity. The amount of ventilation should be determined according to the temperature of the shed and the growth of the leeks. When the cut leeks or the outside temperature is low, the ventilation should be small or delayed, and the wind should be prevented. In addition, in order to reduce the humidity in the shed and reduce the occurrence of diseases, the application of the smoky agent and the dusting agent should be combined to minimize the number of times the liquid agent is used.