Phytoalexins are a group of bioactive compounds that are produced by plants in response to various stresses, including pathogen attack. When a plant is exposed to a pathogen, such as a virus, bacteria, or fungus, it triggers a defense response that includes the production of phytoalexins. Phytoalexins are a type of secondary metabolite, and they have antimicrobial activity against a wide range of pathogenic microorganisms. They work by inhibiting the growth and reproduction of the pathogen, thus preventing further infection and spread of the disease. Phytoalexins are produced by the plant in response to the interaction between the host and pathogen. This interaction triggers a cascade of biochemical events that ultimately leads to the production of phytoalexins. Natural phytoalexins are produced by the plant itself, in response to stress. However, external application of phytoalexins can also induce the production of natural phytoalexins in the plant, thus enhancing its natural defense mechanism against pathogens. One example of a phytoalexin is Phytoalexin-84, which is produced by soybean plants in response to infection by certain fungi. It has been shown to have potent antifungal activity and can inhibit the growth of several pathogenic fungi.
Dosages
• 3 to 4 ml Phytoalexin-84 per litre of water
• Grapes: 1st and 2nd spray in rains 3rd spray before Oct. pruning, 4th spray 12 days after pruning 5th onwards, ten days interval.
• Citrus and Apples: 1st spray before monsoon. 2nd and 3rd spray in rains. 4th and 5th after rains with one month interval.
• Tomato, Potato & Vegetables: 1st spray in nursery, 2nd spray onwards: 15 days after transplanting, bi-weekly application.
• Tobacco: 1st spray in nursery, 2nd and 3rd spray after 15 days transplantation.
• Turmeric and ginger: 1st dose beginning of rains, 2nd and 3rd in monsoon with 30 days gap.
Spray after dilution with water 3 to 4 ml per litre of water
• Onion: 1st spray in nursery, 2nd spray 15 days after transplanting and 3rd if moist weather persists.
• Black Pepper: 1st spray before monsoon, 2nd and 3rd spray, in rains and 4th after rains.
• Cabbage, Cauliflower and Knoikhol: 1st spray in nursery, 2nd spray onwards: bi-weekly starting 15 days after transplanting.
• Capsicum: 1st spray in nursery, 2nd spray onwards: bi-weekly starting 15 days after transplanting.
• Pomegranates and Papaya: 1st spray on onset of rains, 2nd and 3rd in monsoon with 30 days gap.
