Its yellow leaves are mostly infected with yellow leaf disease, which is a common disease.This kind of disease can seriously affect its normal growth, and it should be treated with drugs as soon as possible when it is found.The morbidity initial period may spray the ferrous sulfate solution, or mixes with the citric acid solution, in the middle every 7-10 day spraying.When spraying, it should be carried out in cloudy days to avoid the hot sun, so that the effect will be better.
1. The rainy weather in autumn is frequent, which is easy to cause diseases such as white rot and downy mildew. The diseases occur early and cause serious harm, which is not easy to manage. In this case, the nutrition of the tree body will be consumed too much, and the phenomenon of defoliation will occur.Overwintering is very good, less nutrients, physiological balance will be out of balance, so that when new shoots enter the fast-growing period, it is easy to cause yellow leaf disease.
2. The cultivated plot soil is too alkaline and the pH value is too high, in this case, the iron element will become insoluble iron, which can not be absorbed and utilized, and will lead to yellowing symptoms in the long run.
3, its variety is many, some variety disease resistance difference, easy infection disease, morbidity time is also quite serious.Therefore, when cultivating, it is necessary to select suitable varieties and select those with strong disease resistance.
