The whole plant was diseased and the leaf surface was shrunk and deformed. The pathogen was caused by cucumber mosaic virus. The virus particles were spherical, 35 nanometers in diameter, with a virus-free temperature of 60-70 ℃ and a virus retention period of 3-5 days in vitro. A wide range of hosts. The way of transmission may be through the friction between aphid and juice, so that the disease-free healthy strains.
Scientific and effective fertilization, multi-purpose compound fertilizer and organic fertilizer, avoiding partial application of nitrogen fertilizer, plus application of phosphorus and potassium fertilizer, in order to improve the nutritional conditions of the Columbine, improve the anti-virus ability of the plant; and timely loosen the soil, promote the development of the plant root system. Remove weeds in time. Control aphids as early as possible and eliminate the vector.
At the beginning of the disease, the spots on the leaves were small white powder spots, and then gradually expanded until the whole leaf was covered with white powder. Powdery mildew belongs to the subfamily of cysticercosis. The suitable temperature is 16 ~ 24 ℃, the relative humidity is about 75%, the temperature is high and the air circulation is poor.
In the early stage of the disease, we can choose 300 times of 50% polysulfide suspension, 1500 times of 15% Triadimefon wettable agent, 2000 times of 20% Triadimefon emulsion, and spray once every 7-10 days, 2-3 times continuously.
