A bactericide is a chemically synthesized substance or a natural substance that has a toxic effect on pathogenic organisms. Its main function is: A protection function, that is, spraying sterilization before the plant is susceptible to disease to prevent invasion of the bacteria; B treatment function, taking the plant susceptibility After spraying the fungicide to kill and eliminate the pathogen; C immune function, take out the chemical to improve the disease resistance of the plant.
The fungicides commonly used in jujube trees in China are:
(1) Bordeaux mixture: It is a high-efficiency protective agent with wide application, good efficacy, no pollution, and a long history. It not only has the effect of preventing diseases, but also has the functions of increasing plant enzyme activity, increasing chlorophyll content, increasing leaf cold resistance, and delaying leaves.
(2) Stone sulfur mixture: slightly.
(3) Potassium permanganate: It is a black-purple block crystal and is soluble in water. It is a strong oxidant and is not toxic to humans and animals. Often used to control a variety of bacterial and fungal diseases. Commonly used concentrations are: surface disinfection 0.5% - 1.0%, solution dipping seedlings 0.3%, solution soaking with 0.5%. The mechanism of disease prevention is to use the strong oxidation of nascent oxygen atoms to kill pathogenic bacteria.
(4) Carbendazim: It is a high-efficiency, low-toxic, broad-spectrum, systemic fungicide. Insoluble in water, but soluble in inorganic acids and acetic acid, chemically stable, low toxicity to humans and animals.
Use concentration: 50% wettable powder 1000--1500 times liquid spray; 50% wettable powder equivalent seed weight 0.5% - 0.1% seed dressing.
(5) Topazin: It is a white or light yellow solid, insoluble in water, soluble in organic solvents, and stable in performance. It is low-toxic and harmless to humans and animals. It is a high-efficiency, low-toxic, broad-spectrum, systemic fungicide. Use a concentration of 50% wettable powder 500-1000 times liquid spray, 5000 times liquid soaked fruit. (snow core)
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