Symptoms: if the surrounding climate is sultry, it may be infected with root rot, causing root rot, thus causing problems in the transportation function, resulting in the lack of nutrition in the plant, resulting in dry and poor growth. Finally, it is difficult to supply water and nutrients, resulting in the death of the whole plant. The disease usually starts from late March to early April. There are many causes.
Prevention and control: choose healthy plants when planting, try to avoid occurrence, pay attention to good ventilation at ordinary times, and promote air circulation, which can reduce the possibility of disease. In case of disease, 65% zineb should be sprayed.
Symptoms: this disease is also very common, mainly occurs on the leaves, which will damage the edge and tip of the leaves. At the beginning, it only appears small spots on the leaves. At the later stage, when it is serious, it will lead to the death of most of the leaves.
Symptoms: cut off the diseased leaves at the beginning of the disease and then destroy them together. Spray protective agent before the onset of the disease. When the onset of the disease, spray metformin once every 7 to 10 days, 3 to 4 times in a row.
Symptom: it often infects this pest, sucks the juice inside, causes water shortage and dry up, and affects its growth.
Prevention and control: pay attention to good ventilation at ordinary times, spray with 25% Chlordimeform water agent 1000 times.
