Beware of greenhouse cucumber “Bubble†at low temperatures
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In the early stages of the onset of symptoms, the leaves produce a bulge of about 5 mm. The bulging occurs mostly on the front of the leaves and the back rarely occurs. The leaves were uneven and the depressions were white blankets, scraping them with no attachments. The top of the bag whittled green, gradually yellowed, and finally gray-yellow.
The cause of the disease is mainly caused by low temperature and low light. The temperature of cucumber is low in the early stage of growth, and the light is poor. After that, the weather suddenly turns fine, the temperature rises quickly, and the amount of watering is large; in the case of low-temperature weather, watering and the like are easy to occur. In addition, it is also related to variety resistance, and it is easy to develop diseases that are not adaptable to low temperature and low light levels.
The prevention and control measures often clean the plastic film and glass on the booth to increase the transparency of the booth. Strengthen warming and heat preservation measures to prevent cold damage and frost damage. Reasonable irrigation. Choose to water on a sunny morning and avoid flooding. Strengthen the cultivation and management, pay attention to flushing humic acid, microbial fertilizers, roots and roots to improve plant resistance. Spray potassium dihydrogen phosphate to enhance plant resistance. Increase the amount of basal fertilizer before planting, apply a variety of elements together, without partial application of nitrogen fertilizer. According to temperature changes timely insulation, warming. Timely prevention of pests and diseases.