Causes of and Control Methods for Sudden Wilting and Death of Winter-Spring Cucumbers
Cucumber is a warm-loving vegetable. When growing winter-spring greenhouse cucumbers, the temperature requirements become even more demanding after the plants enter the fruiting stage, and many growers find that their winter-spring cucumbers suddenly wilt and die. What causes this? How should it be controlled? Let's take a look together.
I. Causes of Death of Winter-Spring Cucumbers
When the weather turns clear after snow, if the straw mats are suddenly uncovered, the temperature inside the greenhouse is relatively low at that time, while the cucumber leaves have a relatively large area, which causes the air temperature to rise rapidly and leaf transpiration to intensify, resulting in physiological water loss and wilting of the vines. In addition, flooding irrigation may also cause the plants to wilt. After irrigation, the soil water content is relatively high and the permeability is poor. Under oxygen-deficient conditions, the soil produces toxic substances, causing root poisoning or oxygen starvation and thus wilting.
II. Control Methods
1. After the seedlings return to normal growth, all the straw mats can be pulled up during the day. Even on cloudy days, the straw mats should be pulled up as much as possible to let the seedlings receive more light. However, since the nighttime temperature is relatively low, two layers of protective film are still needed to do a good job of insulation and prevent the seedlings from being frostbitten a second time.
2. After the weather clears, water, fertilize and spray pesticides in a timely manner to promote seedling growth and control pests and diseases. Water thoroughly 15-20 days before cucumber planting. If the soil layer is too deep, the bed surface needs to be leveled again when watering, so that the soil meets the standards of being deep, thorough, fine and level. Drip irrigation is preferable for watering, avoiding flooding irrigation, and keeping the soil well aerated.
3. Strengthen management during the seedling stage, cultivate strong seedlings, and control pests and diseases in a timely manner.
4. Strengthen the insulation, warming and lighting of the greenhouse. Pay attention to insulation before a cold wave arrives, and at the same time be careful not to water, so as to avoid lowering the soil temperature.
5. Fertilize reasonably, apply more decomposed organic fertilizer, and carry out foliar feeding. For foliar feeding, foliar fertilizers such as monopotassium phosphate, Pushibao and Plant AAA can be used to promote robust plant growth. After snow, when the weather clears, the straw mats should be uncovered in a timely manner, uncovering while covering, and warm water at about 20°C should be sprayed on the leaves. Remove old leaves in a timely manner to reduce transpiration.
The above is an introduction to the causes of and control methods for sudden wilting and death of winter-spring cucumbers. We hope it helps you. To learn more related knowledge, please stay tuned to us.