Symptoms: there are dark brown spots on the leaves. The spots on the stems and petioles are long strips with brown color. They are relatively small at first, and become irregular at later stage, causing the leaves to wither and turn yellow, and the whole plant will weaken.
Prevention and control: usually pay attention to good pruning, branches and leaves can not be too dense distribution, maintain a certain degree of ventilation, reduce air humidity. After the onset of the disease can be sprayed with topiramate.
Symptoms: yellow dots will appear on the leaves, and then they will expand to almost round shape. White powdery mildew layer will appear on the surface. The leaves under the plants are seriously damaged.
Prevention and control: powdery mildew is well prevented. Excessive application of nitrogen fertilizer should be avoided. Attention should be paid to pruning the branches and leaves. When the disease occurs, spray 1000 times of 15% Triadimefon.
Symptom: This is a very harmful pest, which mainly nibbles at the root and stem, causing damage to the underground part. After suffering from scarab, the success rate of reproduction will be reduced, in addition, it will also harm leaves, flowers, fruits, etc.
Prevention and control: good and robust varieties should be selected for planting, environmental sanitation should be done well at ordinary times, and more light should be exposed at the same time. After the onset of the disease, it can be sprayed with 10% insecticidal cream 2500 times.
