Treatment of fungal diseases of eggs, go first to symptomatic treatment, egg bacterial diseases prevention and treatment of reasons to need from disease epidemics of the three elements, namely pathogen, host and environmental dimensions to analyze, Chinese pesticide for your specific network Xiaobian analysis:
The first is to send the main element. The selection of disease-resistant or disease-resistant varieties, such as cucumber downy mildew, the northern type of densely thorn cucumber varieties have better resistance, while the southern type cucumber varieties have more resistance.
Followed by environmental factors. The environment is the basis for the survival of vegetables and pathogens. In greenhouse vegetable cultivation, the wintering of pathogens is easier, and the prevalence of diseases often depends more on environmental factors.
Strengthening cultivation management and changing the small environment in vegetable greenhouses can reduce the occurrence of diseases. Doing a good job of pastoral hygiene is the first step in preventing and treating diseases. Improve cultivation methods, strengthen fertilizer and water management, change the growth environment of vegetables, and also affect the occurrence of oomycete diseases.
Reducing humidity is the key to reducing the incidence of vegetable diseases in greenhouses. Oomycetes are more like a high-humidity environment. Oviparous bacteria produce zoospores, which need to swim in liquid water. It is important to reduce the humidity in the shed, reduce the condensation of the film and drip, and reduce the occurrence of diseases. The use of high-quality non-drip film, micro-irrigation technology, covering the mulch film, etc., can well control the humidity in the shed and reduce the occurrence of oomycete diseases.
Finally, the pathogen element. In the shed environment, the number of pathogens is large and easy to spread. After years of continuous planting, the pathogenicity of the pathogens to the same variety is enhanced, and the disease occurs seriously. The pesticide network reminds everyone to control the occurrence of oomycete diseases, mainly from killing pathogenic bacteria, reducing the number of pathogenic bacteria, biological control, physical control, chemical prevention and control, and the effect is good.
1. Biological control. The use of biological bacterial fertilizers, such as actinomycetes, Bacillus, etc., can play a better role in disease prevention. There are many biological bacterial fertilizers commonly found in the market, and the use of better antibacterial 968, Dayuan, Feitiansheng and so on.
2. Physical measures. Physical measures mainly include high temperature treatment, radiation treatment, etc. The oocysts are sensitive to high temperature, and the high temperature shack is an important sterilization method for greenhouse vegetables.
3. Chemical control. Among many control measures, chemical agents are the main means of controlling oomycetes. Reasonable medication is the most effective way to prevent oomycetes. For the chemical control of oomycete diseases, we will introduce them specifically below.
(a) First, it is necessary to know which preparations are effective against oomycetes.
1. The protective preparations mainly include copper, sulfur and substituted benzene, which have good protective effects. The fertilizer inhibits the re-infection process of the bacteria and is not easy to produce drug resistance. The disadvantage is that the plant tissue is submerged. The disease is not effective. In such preparations, Dakonin is the most protective in substituted benzene, but these preparations are usually compounded with a systemic agent in addition to copper. For example, it is imported from the metalaxyl and Dakoning. It is a combination of strong and strong, and is the top killer of downy mildew.
2, systemic therapeutic agents (1) phenylamides such as benomyl is a strong systemic fungicide for the control of oomycete diseases, domestic manufacturers mainly produced by Zhejiang Yifan Chemical Co., Ltd. It has a good effect on the control of grape and melon downy mildew, eggplant and melon disease, tobacco black shank disease, and seedling stage disease. It has high efficiency and basic conduction to oomycete diseases. advantage.
(2) The propofol ingredient in the carbamate, such as the company's popular Caputo and the creamer water refining agent, is known as a special disease for rickets and diseases, and also has good for downy mildew and tobacco black shank. Killing effect. It can also be used as a soil treatment for more than 20 days, and it also has a stimulating effect on crops.
(3) The enoylmorpholine component of the morpholine fungicide is represented by high-purity enoylmorpholine. In addition, there are also such as Xinxi, good dew, and cream partner, which are phenylamides to prevent downy mildew. It is an excellent fungicide for oomycetes and other diseases, which can effectively prevent potato, tomato late blight, cucumber, gourd, grape downy mildew and so on.
(4) Organophosphorus systemic aluminum triethylphosphate The system's systemic absorption is bidirectional, can be absorbed by the roots of plants to the upper stems and leaves, can also be absorbed by the upper leaves and then transmitted to the base leaves, generally with sulfur preparation The compound is mainly used, such as agricultural songs. Can prevent more oomycetes diseases.
(5) Cream ureido bactericides have special effects on downy mildew and Phytophthora, and have no cross-resistance with other fungicides. Generally, they are mainly mixed with manganese, but there are many pesticide manufacturers on the market. The products with better quality can reflect the good control effect. At present, Norrining has a good effect on controlling grape downy mildew and various diseases than the general varieties.
In addition, azoxystrobin and the like are also effective in controlling, but the cost is relatively high.
(2) Pay special attention to the rotation of medication when using the medicine. It should not be used because of the good control effect of a certain product to avoid the occurrence of drug resistance, especially the use of systemic therapeutic agents.
(3) Some varieties can be combined with foliar application and root irrigation to improve the control effect. For example, the cucumber disease, tobacco black sputum with 800 times the frost to root, and combined with the cucumber around the central disease plant spray, better control.
(4) Most of the oomycetes live in water or moist soil, and some of the oomycetes that are close to terrestrial are mainly parasitic in higher plants. Therefore, oomycetes have a common feature of "hydrophilic oleophobic". Thus, in the selection of the pesticide dosage form, the water agent, the water emulsion, the water-dispersible granule, the suspending agent and the oomyce have a better affinity, and are more suitable for the prevention and treatment of oomycete diseases.
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