Symptoms: the main diseases of qianrihong are leaf spot. The spots are almost round. The color is grayish brown to grayish white. The color of the edge is darker. The spot on the tip of the leaf is irregular, large in shape, gray brown in color, and easy to break and fall off.
Prevention and control: pay attention to prevention and control at ordinary times. Collect the infected parts and burn them. Spray them in time at the early stage of the disease. You can also spray imidazole or cyanobacterazole emulsifiable oil. It can't work at one time. It needs to spray once every 15 days, about 2-3 times.
Symptom: this disease mainly starts from the bottom of the stem. At the beginning, it appears water stained and develops rapidly.
Prevention and control: pay attention to cultivation and management at ordinary times, and spray with 50% carbendazim 800-1000 times solution or 50% wettable methyltobramycin.
Symptoms: aphids will gather together, which will have a greater impact on the plant, will gather together to suck juice, causing the plant to dry up, and will die directly in serious cases.
Prevention and control: control aphids from the root, daily strengthen ventilation treatment, reduce the possibility of insect damage. It can also spray chemicals, for example, with 800 times liquid of quick killing (daphnophos).
