1. Rust: This is a fungal disease, which mainly damages the leaves and buds. Generally, it occurs when the leaves are extended in spring. Yellow rust spores will appear on the back, veins and petioles of the leaves. After breaking through the epidermis, they will turn orange red and invade the plants in large quantities. By early summer, it will be serious, causing the leaves to turn yellow, the disease spots to bulge, and the whole plant will die when it is serious. Prune the diseased branches and leaves in time in winter to reduce the source of infection. Fertilizer should be applied reasonably to ensure healthy growth. If after the onset of treatment spray Baume solution.
2. Leaf spot disease: it mainly infects the leaves, flower buds and stem parts, which causes more diseases on the lower part of the branches and leaves. The disease spots on the upper part of the leaves are round or long strip, and then expand into red brown disease spots. Select resistant varieties, increase P and K fertilizer appropriately, and enhance the disease resistance ability of plants. Disinfect the soil before planting and spray Bordeaux solution after the disease.
There are mainly scale insects and aphids in the aspect of insect damage. They are very small in size, but they will suck the juice in the plant, leading to withering and even death of branches and leaves. Take preventive measures in advance, remove the pests manually after finding them, and spray according to the species in the later stage.
