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, bitter melons grow inconsistently inside and outside. Due to the large temperature difference between day and night in autumn and winter, crops have accumulated more dry matter and melon strips have accelerated growth. 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.
The second is that the water supply changes too much. Uneven flooding is an important cause of cracks in bitter gourds. 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 proper dry humidity in the shed, sawdust and rice husks can be sprinkled after watering.
The third is caused by spraying azole pesticides. Due to the relatively low temperature in the near future, the ventilation outlets in the arch shelters have been reduced a lot. Farmers have worried about the occurrence of powdery mildew in bitter gourds and added azole pesticides early in the spraying process. 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.
First, bitter melons grow inconsistently inside and outside. Due to the large temperature difference between day and night in autumn and winter, crops have accumulated more dry matter and melon strips have accelerated growth. 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.
The second is that the water supply changes too much. Uneven flooding is an important cause of cracks in bitter gourds. 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 proper dry humidity in the shed, sawdust and rice husks can be sprinkled after watering.
The third is caused by spraying azole pesticides. Due to the relatively low temperature in the near future, the ventilation outlets in the arch shelters have been reduced a lot. Farmers have worried about the occurrence of powdery mildew in bitter gourds and added azole pesticides early in the spraying process. 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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