It is understood that the greenhouse cucumber that has entered the flowering stage has bacterial bacterial leaf spot disease and must be controlled in time.
The suitable temperature for the occurrence of cucumber bacterial angular spot is 25°C-28°C. Due to the warmer climate in early spring this year, bacterial bacterial angular spot disease in greenhouses occurs in advance. The disease started from the cucumber leaves. At the beginning, there appeared water-stained circular chlorotic spots on the back of the leaves. After being slightly enlarged, the spots were limited to polygonal brown spots and surrounded by yellow halos. When wet, the back of the lesion overflows with white bacteria and pus, and the lesions dry out and form perforations when dry.
It can be sprayed with 72% agricultural streptomycin 4000 times solution or neomycinectin 4000 times solution, sprayed every 7-10 days, and sprayed 2-3 times.
Due to the rainy weather in spring, we should promptly do a good job in the dehumidification of vegetables in greenhouses, use the rain to stop the ventilation on the leeward surface in time, and dry rice straw in the shed. Clean up the diseased plants, diseased leaves, and diseased fruits in time to reduce the spread of pathogenic bacteria.
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