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How to prevent pepper powdery mildew
Pepper powdery mildew typically appears as dense white fungal spots on the underside of leaves, spreading across the entire leaf surface. In severe cases, infected leaves may drop off, and the disease tends to occur under low temperatures and during prolonged rainy periods. This fungal infection thrives in humid conditions, making it particularly common in greenhouses or areas with poor air circulation.
During the vegetative growth stage, the pathogen remains hidden within the leaves, waiting for favorable conditions to produce spores and spread beyond the foliage. Once visible symptoms appear, controlling the disease becomes significantly more challenging. Therefore, early prevention is crucial. It's recommended to apply protective fungicides regularly, especially when signs of the disease first appear. If infected leaves are already present in the field, systemic fungicides must be used, often requiring multiple applications for effective control.
It's common to see yellowing on the lower leaves after treatment, but new growth should remain healthy. To manage this disease effectively, several fungicides can be used depending on their mode of action. Protective fungicides include 50% sulfur suspension diluted at 500 times, 75% chlorothalonil wettable powder at 500 times, 70% mancozeb wettable powder at 400 times, and 80% wettable powder at 500 times. Systemic options include 50% carbendazim WP at 500 times, 70% thiophanate-methyl wettable powder at 1000 times, 15% triadimefon (triadimefonone) EC at 1000 times, 40% STAR 8000 at 10,000 times, 10% Shihshui water dispersible granules at 2000–3000 times, and 25% myclobutanil EC at 500–600 times.
A good combination is mixing 10% Shihshui water dispersible granules (3000 times) with 75% chlorothalonil wettable powder (500 times). When using systemic fungicides, it's important to monitor for resistance. If carbendazim or thiophanate methyl lose effectiveness, switch to triadimefon or Fuxing. If those also fail, consider alternatives like oxazole or other newer compounds. Rotating fungicides can help reduce the risk of resistance development and ensure long-term control of the disease. Always follow label instructions and apply treatments according to environmental conditions for optimal results.