What causes acute wilting in greenhouse cucumbers?
What is going on with acute wilting in greenhouse cucumbers?
(Agricultural Wealth Network) Some cucumber plants in greenhouses suddenly develop acute wilting, and cucumber growers are often puzzled and have no choice but to plow up the soil and replant. In fact, this acute wilting of cucumbers is a physiological disease. Its causes are as follows: first, continuous rainy weather or a sudden clearing after snow leads to a temperature inversion that rapidly wilts and kills the seedlings; second, when cucumbers enter the flowering and fruiting stage, with hot sunny weather, large ventilation, and rapid leaf transpiration, some plants with poor root development begin to wilt, and those with severe water loss wither entirely; third, part of the film covering the greenhouse is damaged, and cold wind invasion causes wilting and seedling death; fourth, the fertilizer concentration is too high, especially when chemical fertilizer is applied close to the root and stem of cucumbers, which can easily scorch and kill the seedlings.
To prevent acute wilting in cucumbers, the following measures should be taken: Water according to the seedlings and the time. Cucumber roots are relatively well developed, but they are mostly concentrated in the surface soil. To promote rooting and avoid watering mistakes that inhibit the growth of the root mass, first, water less at transplanting; second, water the seedlings after revival as appropriate, and when the temperature is low, soil moisture is high, or continuous rainy weather occurs, water less or do not water the revived seedlings; third, when entering the peak fruiting stage, combine topdressing with water to carry fertilizer, watering about once every 10 days, and strictly prevent a single excessive fertilization from scorching the cucumber seedlings; fourth, it is best to water in the morning on sunny days, and avoid watering in the afternoon and evening; fifth, do not irrigate the entire greenhouse on rainy days; sixth, only small amounts of water should be used to moisten the soil, and flood irrigation must not be used. Scientifically control greenhouse temperature: generally do not ventilate at the early transplanting stage, and keep the greenhouse at 25°C~30°C during the day and 12°C~15°C at night, not lower than 10°C. As the cucumber seedlings continue to grow, adjust ventilation and control temperature in time, which can first prevent disease occurrence and second avoid plant aging. However, temperature regulation must be conducive to cucumber growth. Generally, ventilate only when the daytime temperature rises to 30°C, and close the greenhouse film when it drops to 28°C in the afternoon. During the fruiting period, the nighttime temperature should not be lower than 12°C. Strengthen greenhouse protection: first, keep the ditches around the greenhouse cucumbers unobstructed for timely drainage and irrigation, especially to achieve rapid water filtration; second, check every day whether the greenhouse film is damaged or exposed, and repair it in time to preserve warmth and increase temperature; third, before strong winds and cooling arrive, add straw mats and fix the ropes to prevent the film from being suddenly lifted and damaging the cucumber seedlings.
To prevent acute wilting in cucumbers, the following measures should be taken: Water according to the seedlings and the time. Cucumber roots are relatively well developed, but they are mostly concentrated in the surface soil. To promote rooting and avoid watering mistakes that inhibit the growth of the root mass, first, water less at transplanting; second, water the seedlings after revival as appropriate, and when the temperature is low, soil moisture is high, or continuous rainy weather occurs, water less or do not water the revived seedlings; third, when entering the peak fruiting stage, combine topdressing with water to carry fertilizer, watering about once every 10 days, and strictly prevent a single excessive fertilization from scorching the cucumber seedlings; fourth, it is best to water in the morning on sunny days, and avoid watering in the afternoon and evening; fifth, do not irrigate the entire greenhouse on rainy days; sixth, only small amounts of water should be used to moisten the soil, and flood irrigation must not be used. Scientifically control greenhouse temperature: generally do not ventilate at the early transplanting stage, and keep the greenhouse at 25°C~30°C during the day and 12°C~15°C at night, not lower than 10°C. As the cucumber seedlings continue to grow, adjust ventilation and control temperature in time, which can first prevent disease occurrence and second avoid plant aging. However, temperature regulation must be conducive to cucumber growth. Generally, ventilate only when the daytime temperature rises to 30°C, and close the greenhouse film when it drops to 28°C in the afternoon. During the fruiting period, the nighttime temperature should not be lower than 12°C. Strengthen greenhouse protection: first, keep the ditches around the greenhouse cucumbers unobstructed for timely drainage and irrigation, especially to achieve rapid water filtration; second, check every day whether the greenhouse film is damaged or exposed, and repair it in time to preserve warmth and increase temperature; third, before strong winds and cooling arrive, add straw mats and fix the ropes to prevent the film from being suddenly lifted and damaging the cucumber seedlings.