Symptoms: it is mainly harmful to the leaves. At first, there are some small brown spots on the lower part of the leaves, and then they gradually expand. The edge is dark brown, and then they expand into irregular spots. When they are serious, the spots will be connected together, causing the whole leaves to scorch and fall off.
Prevention and control: pay attention when planting, do not plant too closely. Also pay attention to reduce the soil moisture, timely discharge the excess water inside. Cut the branches and leaves frequently to improve the light transmission conditions. In the early stage of the disease, pay attention to spraying agents, 75% Benazolin 1500 times solution can be used.
Symptoms: it is mainly harmful to leaves and stems. The degree of damage to leaves is relatively serious, which may lead to the death of the whole plant leaves.
Prevention and control: pay attention to reasonable fertilization at ordinary times, and appropriately increase the application of P and K fertilizer to improve disease resistance. In the early stage of the disease, it can spray 65% zineb 500 times, which can effectively control the infection of the disease.
Symptoms: the key point is to damage the leaves, stems and flowers. When the leaves are damaged, they will show brown spots on the edge of the leaves, the petioles and flower stalks will soften, and then the skin will rot.
Prevention and control: the diseased branches and leaves should be removed in time, which can be burned intensively. When the disease begins, zinc and carbendazim fungicides can be sprayed.
