Q1
How should I control powdery mildew? What non-agricultural materials are used?
As a preventive measure, plants can be treated with Phosphorous Acid and Potassium Hydroxide , diluted 500-1000 times, every 5-7 days during the seedling stage. If powdery mildew symptoms appear early, they can be controlled with a lime Sulfur or Sulfur water suspension solution, diluted 500-1000 times. Additionally, oil control materials such as neem oil or sunflower oil, diluted 300-500 times, should be sprayed every 5-7 days. Bicarbonate materials, like sodium bicarbonate (baking soda) or Potassium bicarbonate, diluted 200-300 times, can also be used depending on the severity of the disease. For Cucurbitaceae crops (melons), Potassium silicate contains silicon and Potassium, which is very effective in preventing and controlling powdery mildew. Chlorine Dioxide is a fast metabolizing bactericidal agent, while cinnamon oil is a strong antifungal agent, which is effective in the control of powdery mildew.
Q2
How to use Phosphorous acid?
The application of Phosphorous acid can induce the production of large amount of plant resistin to fight against diseases. Phosphorous acid and Potassium hydroxide should be mixed in equal weight ratio (1:1), and the two should be dissolved separately and then mixed slowly to avoid high temperature caused by violent reaction. For foliar spraying, dilute 800-1000 times, and for soil watering, dilute 200-300 times. Short-term crops should be applied at the seedling stage, and fruit trees can be applied more than 3 times before the rainy season, with an interval of 5-7 days each time. It is recommended to use the mixture immediately so as to avoid oxidization of Phosphorous Acid and loss of its effect.
Q3
Is it suitable to spray neem oil, Bacillus thuringiensis and Phosphorous acid together?
Recommended to add Phosphorous Acid, Potassium Hydroxide, Bacillus thuringiensis, and finally add neem oil to the product. Use the product according to the dosage before each application, so as to avoid oxidization of Phosphorous Acid or water separation of neem oil after prolonged storage. If you are not sure whether there is any interaction between the chemicals, read the precautions of the product, or conduct a small area test in the field, or call us for more information.