Symptoms: it is mainly harmful to the stem base or underground roots of seedlings. At first, there are oval or irregular dark brown spots, which will wilt in the early stage, and then the spots will turn dark brown, eventually leading to dry up. Some plants with strong symptoms will only show sunken spots, but will not lead to death.
Control: disinfect the soil in advance and strengthen the field management. At the early stage of the onset of the disease, spray once every 7-10 days, about 2-3 times in a row, you can choose metalaxaxaxamox , target = "blank" > methyllikukudu "< a > < a > < a >, 
Symptoms: the disease is easy to infect after the first rain, especially in the period of high temperature and drought and the alternation of high temperature and high humidity. It will damage the leaves, petioles, young stems, buds, petals and other parts, resulting in white spots on the affected parts, leading to withered yellow and shrunk leaves, and a layer of white mold on the disease spots.
Prevention and control: it is difficult to treat the disease, so prevention should be done well in advance, the rotten organic fertilizer should be applied, the diseased leaves and branches should be removed and burned in advance, powder and rust Ning agent should be sprayed at the initial stage of the disease, and pyrazolyl ester, diesenlian, etc. can be used in the serious period.
Symptom: this kind of pest distributes more, will lie on branches and leaves, and then suck the juice inside, resulting in water shortage and dryness.
Control: if this pest is found to attack, it is necessary to spray Omethoate in time.
