Why does the lettuce leaf appear yellow? Lettuce can also be called lettuce, endive, lettuce, green shoots, bamboo shoots, is an annual or biennial herb, cold-tolerant vegetables, like a cool climate, not high temperature. The stems of lettuce can be eaten raw, cold, fried, and dried. In the process of planting, the leaves of lettuce are yellowed by environmental factors and pests. Then the small series will specifically explain the yellowing of lettuce leaves and disease prevention measures. .
First, the reason why lettuce leaves are yellow
1. Environmental factors: When the lettuce is planted, the temperature difference is large, and there will be condensation water gathering at the leaf edge at night and in the morning and evening. This can happen if the morning sun shines strongly on the young leaves. Therefore, when planting lettuce in the greenhouse, pay attention to ventilation, keep the shed inside relatively dry, reduce the air humidity after watering, or leave a little vent.
2. Disease factors: During the lettuce planting process, the damp environment may cause downy mildew, soft rot, gray mold and other diseases. These diseases are also one of the causes of the yellowing of lettuce leaves. Therefore, the next small series talk about downy mildew, soft rot, gray mold control measures.
Second, lettuce downy mildew, soft rot, gray mold prevention measures
1, downy mildew: wind and rain, insects, high temperature and low temperature, planting too dense can induce this disease; with frosty mildew 600-800 times liquid, evil cream manganese zinc (antivirus cockroach) 500 times liquid, chlorobromoisocyanuric acid, Chunlei, Wangtong and other agents are used alternately for prevention and treatment.
2, soft rot: generally occurs in the middle and late; can be used 72% agricultural streptomycin soluble powder 3000-4000 times or 3% carbendazim wettable powder (Jia Shuang) 600 times liquid irrigation, every 7 days Root once.
3, gray mold: gray mold layer on the surface of the disease; poor drainage, low temperature and humidity under the environmental conditions is easy to occur; available 50% Nong Liling 1000 times liquid, 50% more mold Wei 600 times liquid, 50% procymidone 1000 times liquid, 40% pyrimethanil suspension 800 times liquid and other agents are used alternately for prevention and treatment.
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