American Lagerstroemia speciosa has the symptoms of sooty blotch and how to prevent it?

In sooty blotch, Chinese rose, Lagerstroemia indica, bamboo, plan, chrysanthemum and other plants start to get sick in May and June every year, and reach the peak in June at 5438+ 10, which seriously affects the photosynthesis of plants and even leads to death. The pathogenic bacteria are parasitic on aphids, scale insects and so on. Feeding on the secretions of aphids and scale insects.

Improve and spread quickly.

Control methods: In autumn and winter, plants such as Lagerstroemia indica and bamboo should be treated with sulfur mixture, ethylicin, Chunyu 1 and so on, which need to be prepared now. It can not only kill overwintering germs, but also prevent cold and overwinter safely.

Hua Le and thiamethoxam are continuously sprayed for 2-3 times every 10 ~ 15 days to control aphids in the peak period of aphids and scale insects every year from May.

In July, while dealing with pests, fungicides such as Huamuxinzi and ethylicin were added, and Chunyu 1 was used to regulate plant nutrition and strengthen photosynthesis, which basically ensured that plants were not harmed by sooty blotch.

Fertilization management: apply more organic fertilizer, farmyard manure, phosphorus and potassium fertilizer, and less nitrogen fertilizer.