When the greenhouse cucumber enters the flowering and squashing period, it often happens that the cucumbers that grew well in the previous period suddenly fell dead within a few days. This phenomenon of acute death of cucumbers often results in rapid onset of disease and is difficult to control. The main causes are:
1. The reason for the weather. Persistent rain or after a sudden snowfall caused rapid death.
2. Reasons for release. The cucumber enters the flowering and melon stage, and it is sunny and high-temperature, and the amount of air is large and the leaf surface is transpiration fast. Some plants with poor rooting begin to shrink, and the whole plant wither water is withered.
3. Causes of frost damage. Part of the shed film was damaged, and plants were wilted and dead after the cold wind hit.
4. Reasons for fertilization. Fertilizer concentration is too high, especially if the fertilizer is applied near the base of the stem of the cucumber. Burns cause dead seedlings.
The phenomenon of acute death of cucumber can be prevented by the following measures:
1. Appropriate amount of water. The roots of cucumbers are more developed, but most of them are rooted in the surface of the soil. To avoid watering mistakes and inhibit root development. Planting water with less water and pouring water back into the seedlings. Low temperatures, high soil moisture, or even rainy weather, little or no water. Into the period of fruiting melons, combined with topdressing, with water, fertilizer, once every 10 days or so, to prevent excessive application of fertilizer once burned melon seedlings. It is better to water in sunny mornings and avoid watering in the afternoon and evening. Snowy days should not be watered in the entire shed, and it must be poured with small water.
2. Reasonably control the temperature in the booth. The initial period of colonization is generally not ventilated, and is maintained at 25°C-30°C during the daytime and 12°C-15°C at night. With the growth of the melon seedlings, the small air outlets can be gradually opened and the air is generally ventilated during daytime when the temperature rises to 30°C, and the greenhouse film is closed when the temperature drops to 28°C in the afternoon. The temperature during the melon period should not fall below 12°C.
3. Regularly manage the ditch around the cucumber planted in the greenhouse to ensure smooth flow, so that drainage can be performed in a timely manner. Every day to check whether the film is damaged or leak cover, such as damage should pay attention to timely repair. Before the advent of cool winds, cover the grasshoppers and lock the ropes to prevent cold winds from invading and injuring the melon seedlings.
4. After the shade is over, do not uncover all the grasshoppers. Open a few at a time to prevent the plants from losing water and wilting due to strong light. After 2-3 days, the plants gradually adapt and return to normal management.
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