Potassium Permanganate: A Clever Treatment for Flower Diseases, Plus Notes on Soilless Culture

Potassium permanganate is a strong oxidising agent, commonly used in agricultural production for soil and seedling disinfection and for preventing and controlling crop diseases. Potassium permanganate has the characteristics of leaving little residue and being unlikely to cause phytotoxicity, and it is also very useful in the prevention and control of flower diseases.

Soil disinfection: before sowing, after the seedbed soil has been prepared, spray it with a 400 to 600 times dilution of potassium permanganate solution, then cover it tightly with plastic film and expose it to the sun for about 1 week, after which the film can be removed for sowing or cuttings propagation. For potted flowers, spray the prepared nutrient soil with potassium permanganate solution and seal it with film for a period before use. This can effectively prevent the occurrence of damping-off, stem blight, seedling blight and root rot.

Seed and seedling disinfection: soaking seeds in a 0.1% potassium permanganate solution for 2 hours, or disinfecting seedlings with it, can prevent soft rot, downy mildew and root and stem diseases.

Prevention and control during the growing period: for flowers at the seedling stage after emergence, spray with an 800 to 1000 times dilution of potassium permanganate solution, once every 7 to 10 days, for 3 to 4 consecutive applications; this can control damping-off at the seedling stage in flowers such as petunia, salvia (scarlet sage) and marigold, with better results than conventional pesticides. From the seedling stage to the flowering stage, spray with a 600 to 800 times dilution of potassium permanganate, once every 5 to 7 days, for 3 to 4 consecutive applications, which can effectively control soft rot and downy mildew. The potassium permanganate solution at the above concentrations can also be poured onto the roots to control root rot. At the early stage of viral disease occurrence in flowers, spray with a 600 to 800 times dilution of potassium permanganate, once every 5 to 7 days, for 3 to 4 consecutive applications, or spray with a 1000 times dilution of potassium permanganate mixed with an equal amount of the double-effect growth promoter Virus K, which has a significant effect on controlling viral diseases.

Notes on using potassium permanganate for flowers: because potassium permanganate is a strong oxidising agent, it readily undergoes reduction reactions with organic matter and loses its sterilising effectiveness. Therefore, when using it, avoid stagnant water, sewage or hot water, and prepare it and use it immediately. At the same time, avoid mixing it with strongly alkaline pesticides.