Causes and Control Methods of Sudden Wilting and Death in Winter-Spring Cucumbers
Cucumber is a warm-loving vegetable. When growing winter-spring greenhouse cucumbers, after they enter the fruiting stage, the temperature requirements become even more demanding, and many farmers 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 in winter-spring cucumbers
When the weather turns clear after snow and 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. This causes the air temperature to rise rapidly and leaf transpiration to intensify, resulting in physiological water loss and wilting of the vines. In addition, flood irrigation may also cause the plants to wilt. After irrigation, the soil has a high water content and poor permeability. Under oxygen-deficient conditions, the soil produces toxic substances, causing root poisoning or oxygen deprivation and suffocation, leading to wilting.
II. Control methods
1. After the seedlings resume 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, at night the temperature is relatively low, so two layers of protective film are still needed to keep warm and prevent the seedlings from being frostbitten a second time.
2. After the weather turns clear, water and fertilize in time and spray pesticides to promote seedling growth and control pests and diseases. Water the soil thoroughly 15-20 days before transplanting the cucumbers. If the soil layer is too deep, then after watering the bed surface needs to be leveled again so that the soil meets the standards of being deep, thorough, fine and level. Drip irrigation is preferable for watering, avoiding flood irrigation, so as to maintain good soil aeration.
3. Strengthen management during the seedling stage, cultivate strong seedlings, and at the same time control pests and diseases in time.
4. Strengthen the warmth retention, heating and lighting of the greenhouse. Pay attention to keeping warm 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, you can use potassium dihydrogen phosphate, PNS Shibao, plant AAA and other foliar fertilizers to promote robust plant growth. After snow when the weather turns clear, the straw mats should be uncovered in time, uncovering while covering, and the leaves should be sprayed with warm water at about 20°C. Remove old leaves in time to reduce transpiration.
The above is an introduction to the causes and control methods of sudden wilting and death in winter-spring cucumbers. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.