Low-temperature light cucumber easily burned

Symptoms of the symptoms There are no necrotic spots on the leaf margins of the cucumber, but chlorotic spots appear on the leaves of the leaf margins. With the passage of time, necrotic spots gradually expanded and increased in size. If the adversity continues, this part of the leaf will be necrotic, but the leaf flesh around the big leaf veins will remain green and the leaves will gradually curl downwards, shaped like parachutes.

Etiology analysis This is a kind of phyllosma caused by strong light in low temperature environment. It belongs to physiological disease and mostly occurs in the solar greenhouse at low temperature. The occurrence of this disease is due to the cucumber varieties themselves. Some varieties have poor low temperature resistance and are not resistant to glare. This phenomenon will occur in low temperature seasons. In addition, some non-standard greenhouses, although the thin film light transmission performance is very good, but the wall is thin, resulting in poor overall thermal insulation of the greenhouse, especially the soil temperature is low, under strong light, the leaves are easily burned.

Prevention and control measures This disease is a kind of chronic adversity physiological disease, some vegetable farmers take temporary warming is often unable to solve the fundamental problem, and time-consuming and laborious, labor and people hurt. Therefore, the selection of varieties with strong adverse environmental resistance and the construction of a high-standard, high-performance solar greenhouse is the fundamental solution to this disease.

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