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Potassium phosphite should be familiar to everyone. It is often used to supplement the phosphorus and potassium elements required by crops and promote the aging of new shoots and the greening of young fruits. The use of medicine in the spring and young fruit period will not cause phytotoxicity to young fruits. . In fact, the function of potassium phosphite is not limited to this. Potassium phosphite contains a relatively high content of phosphorus and potassium, and its unique trivalent phosphorus (phosphite HPO3) can supplement the phosphorus and potassium nutrients required by citrus, thereby promoting the maturity of new shoots, coloring and sugar lifting. Potassium phosphite is registered on crops as a fungicide. It is systemic and can activate the crop’s active defense mechanism, kill bacteria and inhibit the occurrence of diseases, and enhance the crop’s own resistance to diseases. There is also an important point. Is repeated use will not produce resistance.

Let's briefly understand the principle of potassium phosphite to prevent ulcer disease:

  1. When a pathogen invades, it can induce the seedling cells to produce lignin, increase the thickness of the cell wall, and make it hard and firm, and confine the pathogen to the cell wall, single cell or local tissues, thereby preventing its further invasion and expansion;

  2. Potassium phosphite can directly attack pathogens and induce crops to produce defensins (PA), which are toxic to viruses, which can inhibit and kill pathogens. Therefore, the synthesis and accumulation of defensins is an important disease resistance of plants. Defense response

  3. After the invading pathogens are controlled, potassium phosphite can induce crops to send out disease resistance signals, which are transmitted to other cells that have not yet received the attack to activate the defense system, and then cause the entire plant to resist the same pathogen or other pathogens, and the system can be Disease resistance.