Domestic phosphorous acid is often added as a chemical intermediate by a few fertilizer companies. Phosphorous acid is officially registered as a fungicide in foreign countries for use as a fungicide, such as Japan and Vietnam. It is also used in bactericides as an additive to increase synergy. It is said that most of the fungicides of imported pesticide companies have phosphorous acid as an auxiliary agent. Phosphorous acid is now used more in fertilizers to add synergies.
Phosphorous acid resistance mechanism
Phosphite's disease resistance is a kind of acquired Systemic Resistance (SAR), also known as Inducing Systemic Resistance (ISR), which is a kind of generalized biological control. +3 Valence P triggers the molecular response in plant cells, and exerts its antibacterial effect by activating the plant's own immune system and defense mechanism. +3-valent P changes the fungal wall by inhibiting the formation of spores and inhibits its further proliferation, thus controlling the disease and its further spread. Therefore, the phosphite molecule has a dual mechanism of action. In plants, phosphite-induced resistance is caused by a fungal infection at the molecular level. Potassium phosphite also causes the walls of pathogens to fall off by killing the surrounding plant cells. This is called an allergic reaction, which is a bit like a fire line around a forest fire. This is a diseased area commonly observed around yellowing and developing necrotic tissue. But the plant reacted further, releasing phytoprotection, reminding the rest of the chloroplast plant to start producing other compounds, increasing the plant's resistance to infection or other pathogenic attacks on the plant. These reactions are called acquired systemic disease resistance and induced systemic disease resistance. Among them, the functional potassium of potassium phosphite also provides a certain degree of disease protection by maintaining the swelling of plant cells and inducing growth.
Phosphite is a highly mobile molecule that can be easily absorbed by the leaves and roots of plants and move throughout the plant.
Therefore, phosphorous acid can be used by foliar spraying and irrigation and fertilization, and is quickly moved and absorbed through the xylem and phloem.