Symptoms: after being damaged, there will be small purple brown spots on the leaves. In the later stage, they will gradually expand into brown red spots, and then the edge will be raised, with certain stripes. The spots will also start to wither and sink, eventually leading to gray white and many small black spots.
Prevention and control: before the end of winter, the diseased leaves on the plants should be cut off, and then piled up and burned, so as to reduce the source of the disease. When the disease, but also spray a little bit of carbendazim, one-time difficult to eradicate, can spray 3-4 times continuously.
Symptoms: in the larval stage, if the roots and stems reach the adults, they will bite the stems and eventually cause the whole plant to die.
Prevention and control: when it is found that insect damage occurs, the drooping leaves shall be cut off in time, so as to kill the larvae that may be hidden on them, and when they hatch into adults, they can be killed in time.
Symptoms: both nymphs and adults will suck its juice. In serious cases, the leaves will fall down early, affecting flowering.
Prevention and control: if you find a lot of pests, you can scrape them off. During the incubation period, dipterex or daofengsan can be sprayed once every 15 days, 2-3 times in a row.
