Causes and Prevention of Cucumber malformation due to lack of continuous Rain and Light

Cucumber abnormal reasons: lack of light, high temperature at night, small temperature difference between day and night, irrigation suddenly more and less, easy to appear thin waist melon. If the growth is too prosperous, the melon seedlings will grow out of balance or suffer from disease, resulting in more curved melons. Cucumber is lack of nutrition during the growth period, and its growth is weak or harmed by aphids, downy mildew and other diseases and insects, so it is easy to grow into sharp-billed melon.

Cucumber deformity

During the growth period of cucumber, high temperature, high moisture, exuberant growth, fast growth of melon strips, or low temperature, continuous rain weather, low ground temperature, etc. during the flowering period of cucumber, poor pollination was caused by high temperature, high moisture, exuberant growth, fast growth of melon strips, or low temperature, continuous rain, low ground temperature, etc., resulting in poor pollination, poor pollination, insufficient nutrition, or lack of water, uneven development of ovules, more seeds at the top of melons, thick melons, but few or seedless seeds in the middle and lower parts of melons, and melons grew thin and became big-bellied melons. Cucumber often forms double ovary or 4-carpel ovary at low temperature during flower bud differentiation, which is easy to grow into short and deformed "melon balls". Due to the excessive application of nitrogen fertilizer or the lack of phosphorus and potassium fertilizer, especially the sudden excessive application of nitrogen fertilizer, the cucumber grows only and the sitting melon is irregular, and the cucumber on the side branches and weak branches is prone to bitterness. In addition, in low temperature and light days, especially in continuous cloudy days, cucumber roots absorb less water and nutrients, and melon strips grow slowly, which often accumulates more picrin in roots and lower melons, resulting in bitter melons.

Precautions: 1. Control the temperature. In the cucumber seedling stage, especially in front of two true leaves, the temperature difference between day and night is larger, and the night temperature is not lower than 12 ℃, so as not to form abnormal ovary and grow into deformed melon. During the cucumber fruiting period, the temperature difference between day and night should also be larger, the daytime temperature should not exceed 30 ℃, the night temperature should be 16 ℃-18 ℃ in the middle of the night, and 13 ℃-15 ℃ in the second half of the night. Ventilation should be strengthened to prevent it from exceeding 30 ℃, so as to ensure normal pollination and fertilization and make cucumber strips grow symmetrically.

two。 adequate manuring. Apply sufficient base fertilizer and increase the application of organic fertilizer and phosphorus and potassium fertilizer. The method of topdressing was adopted in a small amount and many times, after the melon was harvested, the first fertilizer was applied, and then once every 10 days, the amount of nitrogen fertilizer was strictly controlled, and the formula fertilization technology was adopted. When applying fertilizer, the ratio of nitrogen, phosphorus and potassium was 5 ∶ 2 ∶ 6 to prevent the overgrowth of plants. In the middle and later stage, 0.2% potassium dihydrogen phosphate solution was sprayed on the leaves to prevent plant premature senescence.

3. Water properly. During the growing period of cucumbers, especially in the melon-bearing period, it should not be considered that cucumbers like fertilizer and water, so they are fertilized and irrigated in large quantities, resulting in "running seedlings", let alone drying and waterlogging. Pay attention to watering in sunny days to prevent water shortage. Watering should be controlled, especially during the expansion period of cucumbers.

4. Strengthen the prevention and control of diseases and pests. Cucumber downy mildew, blight, Botrytis cinerea and other diseases should be often observed in the early stage of cucumber growth, and the central diseased plants should be found, removed in time, buried deeply in diseased leaves and prevented from expanding infection. It can be sprayed with 10% Kejia suspension 1000mur1500 times, 64% antiseptic alum wettable powder 400mur500 times, or 72.2% Purek water agent 600mur700 times, sprayed once every 10 days, and used 4 times in a row.

The method of applying aerosol to prevent and cure the disease can also be adopted, without increasing the humidity in the shed, 250 grams of 45% chlorothalonil smoke agent per mu is used in the shed, and the smoke is lit one by one from the inside to the outside in the evening, and then the shed is smoked one by one. Generally, the smoke is released once in 10 days, and it is used 3 times in a row. 10% imidacloprid wettable powder can be sprayed on aphids and whitefly.