Some brownish cracks appear on the melons of the bitter gourd in the greenhouse. The vegetable growers call them "dry lines." These "dry lines" seriously affect the yield and quality of bitter gourd. Experts believe that this is a physiological disease, mainly caused by the following reasons.
First, uneven growth of bitter gourd inside and outside due to large temperature difference between day and night in autumn and winter, crop dry matter accumulation, melon strip growth accelerated. The melon skin is greatly influenced by the external environment. Under the circumstances that the temperature changes greatly, the phenomenon of "skin tightening" that the common people say is likely to appear. This inconsistent growth rate inside and outside the melon, resulting in bitter melon cracks. In general, the suitable growth temperature of bitter gourd is 20 °C ~ 30 °C during the day and 15 °C ~ 20 °C during the night.
Second, the change in water supply is too much. The uneven distribution of drought and flood is an important reason for the cracking of bitter gourd. If the young larvae are too dry, the fertilizer and water will be supplied well during the expansion period, which will cause the original rind to crack. It is recommended that the vegetable farmer apply water according to soil moisture, and the fertilizer and water supply should be uniform. In order to maintain a suitable dry humidity in the shed, sawdust, rice husks, and other debris may be sprinkled after watering.
Third, due to the low temperature in recent days due to the low dose of azole pesticides, the sheds of greenhouses have been reduced a lot, and farmers have worried about the occurrence of powdery mildew in bitter gourds. They have added azole pesticides early in spraying. As everyone knows, azole pesticides can hinder the development of bitter melon skin, causing bitter melons to crack. In this regard, the growth of bitter melon skin can be promoted by spraying expansin, cytokinin and the like.
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