12/3/2023 0 Comments Mold on bee balm plantMany different fungicides are effective in protecting plants against powdery mildew if applied correctly.Once the majority of leaves have leaf spots, it is too late to treat. Fungicides will not cure or remove existing powdery mildew infections.Repeat applications are often necessary throughout the growing season and should be applied according to label instructions.When the first leaf spot is observed, pinch off the infected leaves and begin fungicide sprays to protect healthy tissues. Examine plants with a history of severe powdery mildew once a week.Fungicides must be applied to healthy green tissue early in the growing season before infection begins.If you must use fungicides, follow these guidelines: Powdery mildew easily infects this lush growth.įungicides should only be used to protect high-value plants that cannot be replaced and have a history of severe infection. Don’t use too much nitrogen because it may cause the plant to produce new young, green growth.Apply fertilizer according to soil test results or as required by the particular plant species.Mulch the soil around the plants with wood chips or other organic mulch.This increases airflow and light throughout the plant. When planting, space the plants to allow adequate air circulation through them.Look for powdery mildew resistant varieties in seed catalogs, on seed packages and on plant labels. Powdery mildew resistant varieties are available for some flowers.Replace severely infected plants with a resistant variety or with a plant from a different family.Tolerate powdery mildew infections that don’t reduce plant growth and flowering. Powdery mildew on sunflower leaves How to manage powdery mildew No management necessary New spores may also be carried into the state by the wind, after surviving the winter on plants in southern states.In Minnesota, this may mean that the fungi survives on greenhouse plants. Some powdery mildew fungi survive on leaves that remain green throughout the winter.Spores are later released when the weather becomes right. These resting structures contain and protect spores during harsh weather. Powdery mildew fungi can also create a dark, round, hard, resting structure known as a chasmothecia.Some of the fungi infect buds of woody plants. Powdery mildew fungi survive winter in several ways.
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