The symptoms of ethephon damage are mild, and the lighter phytotoxicity is characterized by wilting at the top of the plant. The leaves and flowers of the lower part of the plant gradually turn yellow and fall off, and the fruit remains mature in advance. The heavier phytotoxicity is that the whole plant leaves turn yellow quickly, shedding, and the fruit matures and falls off, leading to the death of the whole plant. Excessive use of ethylene or improper use of time can cause phytotoxicity. Ethephon damage does not affect the crops.
Ethephon is a high-efficiency plant growth regulator that increases the number of female flowers. However, if the concentration is too high, seedling growth will be stagnant, and flower topping or formation of dead seedlings will occur. Cucumber is remedy by ethephon, and it can be remedied by supplementing fertilizer and water, improving shed wetness and hormonal regulation.
Hormone regulation, cucumber 4 leaves 1 heart period, the application of ethephon concentration greater than 200 mg / liter is the occurrence of phytotoxicity, after the occurrence of phytotoxicity, you can immediately spray 20-50 mg / liter of gibberellin solution to adjust, every 7 days Spray once, usually return to normal growth in about 15 days.
Supplement fertilizer water, after the occurrence of phytotoxicity, increase the application of quick-acting nitrogen fertilizer according to the degree of phytotoxicity, and increase the number of irrigation to ensure sufficient supply of fertilizer and water. Increasing the temperature of the shed, under normal conditions, the temperature of cucumber seedlings is controlled at 25-28 °C during the day and 13-15 °C during the night. After the phytotoxicity, the shed temperature increased to about 30 °C during the day, and the original temperature was maintained at night to promote the growth of the seedlings and the continued differentiation of the female flowers.
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