High temperature damages cucumbers in summer

After being damaged by high temperature, cucumber plants showed stem elongation, cotyledon and true leaves were thin and thin at the seedling stage, and the leaves were light green and long-cropped. In the mid-term, the thin leaves and internodes were thin or the leaves were enlarged and soft. The thin, light green leaves, the leader does not shrink shrinkage, thin flowers, light yellow. Abnormal symptoms of the leaves: When the leaves are drying at high temperature, the leaf margins are rewinded downwards, the veins are sunken, the leaves shrink, the leaf color changes from green to yellow, and then it turns dark brown, and the texture becomes brittle. In severe cases, the whole leaf is dry and dead; at high temperatures At high humidity, the leaf area increases, the leaves are thin and soft, the leaf color is light green, the petiole is elongated, the middle and lower leaves begin to turn yellow due to the effects of high temperature, high humidity, and low light, and then the mold becomes rotten or the leaves darken green and dull. Wilting drooping. This phenomenon occurs when the temperature in the shed (room) is high and the ventilation is poor. When the shed is hot, it occurs. In early spring, there is a large temperature difference between inside and outside the shed, and there are occasional water-soaked spots on the back of the middle and upper leaves, resembling lesions that disappear near noon or after ventilation. This phenomenon is caused by high temperature in the greenhouse, near-saturation of air humidity, dripping on the greenhouse, and dew condensation on the leaves, which may affect the transpiration of the foliage. If it is not timely ventilated, it can easily cause serious diseases. Abnormal symptoms of the stem: When the melon period suffers from high temperature damage, the petals are closed and cannot be flowered. When the temperature is high, the ovary is withered and the male flowers fall off. High temperature easily produce bisexual flowers, or male flowers and fruit set. Stamens are produced on the side of the female stylar head, while the base of the male flower expands, resembling an ovary, or forming a melon-shaped cucumber. In addition to high temperature conditions, this condition occurs when there is excess nutrients; at the same time, it is also prone to malformed flowers, and female flower petals are metamorphosed. Abnormal symptoms of melon: In the case of high temperature, drought, moisture, nutrient supply, easy to produce "long melon", "with a hook melon"; when the temperature and humidity are not uniform, it is easy to produce "Taligua melon" and "Beaks, waist, melon." Especially in the late growth period, if the temperature is not properly managed, the fertilizer and water will be unfavorably regulated, the ventilation near the ground will be poor, and the proportion of abnormal melons will increase.

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