Continuous cloudy days, foggy days, insufficient light, excessive use of nitrogen fertilizer or lack of fertilizer, and high temperature in the greenhouse are all conducive to the occurrence and prevalence of cucumber powdery mildew. The diseased parts and diseased leaves are seriously affected, the petiole and stem are second, and the fruit is less affected.
At the beginning of the disease, white round-shaped small star-shaped powder spots were produced on the back and stems of the leaves, which were mostly in the leaves, and then expanded to a contiguous white powder with no obvious edges. In severe cases, the whole leaves were covered with white powder; in the later stage of the disease, white mildew spots As the mycelium matures into gray, the diseased leaves are yellow and dry, losing photosynthesis function but not falling off.
Propagation pathway Powdery mildew in the low-temperature dry areas with closed capsules with diseased bodies in the field overwintering, the early spring after the spring to produce ascospores caused initial infection. In warm areas and greenhouses, the pathogens mainly overwinter the mycelium and conidia on the diseased plants and spread by airflow.
Control method
1 In the late June to early August, the head simmered cucumber will be shackled during the period when the cucumber seedlings have not been planted, and the shed film will be closed for 7 to 15 days after the soil in the shed is deepened. On the greenhouse effect, the temperature in the shed can reach above 60 °C, and it can effectively kill most of the bacteria for a period of time.
2 combined with the shack, using a sulfur evaporator to fumigate sulfur to prevent disease.
3 Cucumber grows in the process of continuous rainy, continuous drought and other weather, in the morning 1-5 am, the use of sulfur evaporator fumigation of sulfur, continuous fumigation 3 times can play a good preventive effect.
4 For the cucumber powder, which is easy to occur in cucumber, etc., it can be used for fumigation for 4 hours in the porcelain bowl. It can kill all the white powder mites and has no phytotoxicity to cucumber.
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