How to treat powdery mildew

Powdery mildew is a common plant disease, which mainly harms leaves as well as stems and ears. The main harmful crops are wheat, cucumber, grape and so on. So, how to treat powdery mildew?

First, how to treat powdery mildew?

When purchasing seedlings, disease-resistant varieties should be selected to eliminate the source of the disease. If infected, the foliar spray of 27% high-fat membrane 100x solution at the initial stage of the disease, once every 6-7 days, for 3 times; when the disease occurs, it can be sprayed with 20% tetrafluoropyrazolyl ester, 1000-fold solution of 15% strychnine, 200-fold solution of 2% antimycin water agent, 1000-1500 times solution of 10% polyantimycin until there is no white powder, and the effect of traditional medicine is sharply reduced due to repeated use, so it is recommended to use alternately.

Second, the harm of powdery mildew

At the beginning of the disease, the disease is white, and then the color gradually changes to light brown, which can form a black apothecium by self-crossing or hybridization. In general, there are more leaves than the upper leaves, and more leaves on the back than on the front. Mildew spots were dispersed alone in the early stage, and then combined into a large mildew spot, which could even cover the whole leaf, seriously affecting photosynthesis, interfering with normal metabolism, causing premature senility and loss of yield.

There are two main conditions for the prevalence of powdery mildew, one is to plant susceptible varieties in a large area, and the other is suitable environmental conditions. In general, in the case of high wheat density and excessive application of nitrogen fertilizer, the wheat plant grows vigorously, the plant is weak, the field humidity is high or lodging occurs in the wheat field, the disease is often more serious. The disease generally appeared in the disease center from the end of March to the beginning of April, and the rate of diseased plants increased rapidly with the gradual rise of temperature after the middle of April, which led to a pandemic under suitable conditions.

The treatment of powdery mildew is mainly extinct from the source. If the disease has already occurred, it needs to be treated with drugs. I hope the above content can bring help to you.