Symptoms: this disease belongs to one of the fungal diseases, which mainly damages the leaves. At the beginning of the disease, there are many light yellow spots on the leaves, and the middle part contains many black spots. After that, the surrounding area will turn yellow, and with the subsidence, it may also infect the stems and branches when it is serious.
Prevention and control: when disease is found, cut off the infected part first, and then spray a little carbendazim solution.
Symptoms: the disease starts from the middle part of the leaves. At the beginning, small brown spots will grow on the tip of the leaves. At the back, the disease spots will be synthesized. At the later stage, the leaves will dry up seriously.
Prevention and control: in the early stage of the disease, the diseased leaves can be removed in time, and then the chlorothalonil can be sprayed, which needs to be sprayed once every 10 days or so, 2-3 times in a row.
Symptoms: aphids will gather together, damage the leaves, buds and flowers on the plant, and suck the juice inside, resulting in malnutrition. Excreta will also lead to the growth of mold and other diseases.
Prevention and control: the prevention and control measures must be timely. When the eggs hatch from March to April, they can be sprayed with Omethoate and fenitrothion EC, which are sprayed once every 7-10 days, and can be basically removed 3-4 times in a row.
