Control methods of grape downy mildew
Prevention and control methods: 1, remove fallen leaves, diseased branches buried or burned. 2. Timely coring, pruning, drainage and weeding, and increasing application of phosphorus and potassium fertilizer. 3. In the early stage of the disease, that is, after July, the medicine was used immediately when there was a slight disease spot on the back of the leaf. The drugs were used alternately, such as Paebo, Ruidui, disinfectant alum, metalaxyl, downy mildew, etc., and sprayed 4 times in a row for 5 times.
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How to treat the rotten grapes?
According to your description, it may be grape white rot, which is one of the most important grape diseases, especially in rainy years, which is often prevalent with anthracnose. Grape white rot can damage ears, branches and leaves. After being invaded, the ear and rachis become light brown, water-immersed rot, the whole ear or part of the spikelet.
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Management measures of grape in three main periods
The main flowering diseases of grape such as Xiahei and Red Earth are Botrytis cinerea and ear axis brown blight, both of which belong to fungi. Botrytis cinerea, also known as ear rot, has occurred more seriously in recent years. More than 70% of flowers can be destroyed in orchards with severe disease, mainly harming Corolla, floret peduncles, spike pedicels and pollinated young before and during anthesis.
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