Cucumber flower topping is a kind of physiological disease. In the shed indoors, cucumber production often occurs in winter or early spring, delays the period of nectar, reduces the yield, and affects the economic benefits.
I. Symptoms Cucumber seedlings and the initial stage of colonization are more likely to occur. The growth of the melons is stagnant, and the leading tightly gathers. The internodes near the growing point show a short contraction, and the small leaves are dense. Each leafhopper grows small Guai New Zealand, a large number of female flowers grow and open, resulting in a capped, known as "flower topping." In the cucumber harvest and late growth stage, symptoms can also be presented. The top is clustered with multiple flowers. The flowering nodes near the growth point on the melon pods are shorter than the distance between the healthy plants by 50 cm. The melon strips stop growing and have no production value.
Second, the cause of the disease Flower topping is due to high temperature or low temperature, lack of water and fertilizer and excessive, excessive seedlings, improper fertilizer application or underground pest damage roots, too much fruit, growth point damage, pesticides and auxin poisoning and other adverse environmental conditions, reduce The aging phenomenon caused by the physiological function of cucumber plants. The most important of these is the greenhouse soil temperature is too low, cucumber root development is poor, weak activity, photosynthesis products, coupled with large temperature difference between day and night, night temperature is too low, the transfer of nutrients to the new location (head), melon The vegetative growth of the strain is inhibited, reproductive growth exceeds vegetative growth, and thus flowering occurs.
Third, prevent remedial measures
1. Increase the temperature of greenhouses. Choose greenhouse type greenhouses, greenhouse membranes, and new solar greenhouses with good structure. Combine multi-layer covering measures to increase the effect of temperature increase and heat preservation. The daytime temperature is maintained at 25°C-30°C, which is conducive to photosynthesis of plants. At night, the temperature is kept above 10°C-15°C to ensure that the leaf assimilation products are normally transported to the leading parts and melon strips.
2, rational watering to cultivate strong seedlings, reduce root damage when planting, timely irrigation.
3, scientific fertilization to fully apply the organic fertilizer, adequate amount of uniform fertilizer, to avoid improper use of fertilizer and damage the root system.
4, remedial measures have been on the top of the hibiscus, appropriate to increase the ground temperature, water control fertilizer, remove the small Gua new, timely removal of useless melon strips. Seedlings sprayed with 75% gibberellin crystal powder 0.5-1.5 g/mu, or with a concentration of 187.5-562.5 g/l gibberellin, or foliar fertilizer spraying Shibao, along with other measures.
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