Occurrence and Control of Physiological Wilt of Cucumber in Spring Exposure

In the cultivation and production of cucumbers in spring exposed land, a period similar to that of cucumber fusarium wilt often occurs during the fruiting period till the end of the fruiting period (from the end of July to the end of August). In the early stages of disease, the diseased plants are wilted during the day and recover at night. After repeated days, the whole plant The wilting dead, but in the rapid development of the disease, the leaves suddenly wilted from bottom to top. This symptom is especially severe during the period of fruiting. However, the difference from cucumber fusarium wilt is that it crosses the diseased stem and does not show brown vascular bundles. It can be concluded that this symptom is physiological wilting of cucumber.

First, the cause

1, cucumber vegetative growth stage, fertilizer and water management overtime, resulting in high soil nitrogen concentration, soil moisture, resulting in cucumber above ground (shoots and leaves) and the underground part (root) growth is not coordinated. Due to the suitable conditions, stems and leaves consume a large number of photosynthetic products, so that the photosynthetic product has less input roots and the root growth is hindered. After the results of cucumber, most of the photosynthetic products were transported to the fruit and the roots were in a state of “starvation”. At this time, the plants had a large amount of growth and strong transpiration, which could easily cause wilting.

2, improper irrigation time. After the cucumber results, the amount of water required is large. When irrigation is performed at high temperature, the soil temperature decreases rapidly, normal physiological activities of the root system are inhibited, and the root system is injured, and the ability to absorb water and mineral elements is reduced. The stems and leaves in the atmosphere, strong transpiration. Loss of moisture in the leaf blade and the absorption of water in the root system can easily cause acute wilting.

3, the root system of hypoxia. After the results of cucumber, the growth is strong, and normal physiological activities require the roots to absorb a large amount of water and mineral elements. However, after a period of natural cultivation and operation, the soil is loosened and the soil pore volume is reduced. Poor soil ventilation conditions, lack of oxygen in the roots, and a large decrease in root hairs, affecting root absorption, can also lead to wilting.

Second, control methods

The total prevention and control method of physiological wilting of cucumber is through optimizing the farming measures, improving the root growth conditions, rooting, cultivating roots, and promoting the development of the root system.

(1) Increase the organic fertilizer, control the amount of nitrogen fertilizer, and increase the amount of potassium fertilizer. Intensive farming, creating good soil structure and pore conditions, improving soil permeability. (2) Irrigation should avoid heat during the evening when it is cool. (3) Colonize the roots and go to jail, control the irrigation and cultivating 2-3 times, the depth should be deep and shallow first, enhance soil permeability, promote root growth, and the results should be followed by multiple shallow cultivators.

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