Potassium phosphite is often used as a new type of sterilization type environmental protection material abroad. In addition to being used as a high-phosphorus potassium material, it has good color inhibition on fungal diseases such as Phytophthora, downy mildew and powdery mildew. The effects of suppression and control of sexual diseases are also very significant.
The safety of potassium phosphite mixed is particularly high, but the cost is low and the effect is good, which is unmatched by conventional phosphorus and potassium fertilizers. Compared with copper preparations, copper preparations are more prone to phytotoxicity. Potassium phosphite can be used safely in both flowering and young fruit periods. Therefore, using potassium phosphite to prevent diseases is a very good choice.
The principle of disease resistance of potassium phosphite
After potassium phosphite is applied to crops, it can be absorbed by plant leaves and roots and transported to the plant body to exert the direct sterilization function of shellfish. At the same time, the disease resistance defense system is activated. When pathogens invade the plant, the plant is stimulated to produce plant defensins to produce disease resistance When the pathogenic bacteria invade, the pathogenic bacteria can be attacked by potassium phosphite, so that the pathogenic bacteria are partially controlled. At this time, the pathogenic bacteria are also recognized by the plant cells, so that the potassium phosphite starts the defense system to produce plant defensins and PR proteins, directly attacking the pathogenic bacteria And it will issue a warning call to other cells that have not yet been invaded to activate the defense system, and then add additional proteins to the polysaccharides to strengthen the cell wall, so that the pathogens will be suppressed or killed by the plant's reaction.
Potassium phosphite's disease resistance is an acquired systemic disease resistance SAR, also known as induced systemic disease resistance ISR, which belongs to the generalized biological control species.
The important role of potassium phosphite in plant disease resistance is mainly manifested in the following aspects:
When pathogenic bacteria invade, it can induce seedling cells to produce lignin, increase the thickness of the cell wall, make it hard and firm, and limit the pathogenic bacteria to the cell wall, single cells or local tissues, thus preventing its further invasion and expansion; potassium phosphite can Directly attack pathogens and induce crops to produce substances that are toxic to the virus-defensin (PA), which can inhibit and kill pathogens.