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The suitable temperature for the occurrence of bacterial bacterial leaf spot in cucumber is 25 °C-28 °C. Due to the warmer climate in the early spring of this year, the bacterial angular spot disease of cucumber in the greenhouse occurs in advance. The disease begins to infect the leaves of cucumber. At the beginning, there was a water-like round chlorotic spot on the back of the leaf. After a slight enlargement, it was polygonal brown spotted by the veins, and surrounded by a yellow halo. When wet, the back of the lesion is overflowing with white pus, and when it is dry, the lesion is cracked and a perforation is formed.
It can be sprayed with 72% agricultural streptomycin 4000 times solution or neomycin oxytetracycline 4000 times solution, sprayed once every 7-10 days, and sprayed 2-3 times.
Due to the rainy weather in spring, the dehumidification work of greenhouse vegetables should be done in time, and the rain stop interval should be used to ventilate the leeward surface in time, and the straw can be dried in the shed. Clean up diseased plants, diseased leaves, and diseased fruits in time to reduce the spread of pathogens.
It is understood that cucumbers in greenhouses that have entered the flowering period have bacterial keratosis and must be treated in time.
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