In the early spring, the courgettes of the greenhouse are prone to fruit enlargement, yellowing and wilting, and finally they are dry-like symptoms, commonly known as melons, which may appear before and after flowering.
First, the reasons for melon (a) in early spring zucchini leaf assimilative function decline, plant photosynthetic accumulation. (b) Since the summer squash is a cross-pollination crop, pollen development is poor under low temperature and high humidity, and it is not easy to disperse pollen, and female flowers cannot receive pollen fertilization and lead to melon. (3) Early spring is affected by the low temperature and short days of sunshine, which leads to more female flowers in the squash and less male flowers, resulting in poor pollination and mellow melon. Some varieties of pollen undergrowth at low temperatures can also cause melons.
Second, prevention and control methods (a) control the night temperature, prevent nighttime temperature is too high, in order to reduce respiratory consumption. At the same time, carbon dioxide gas fertilizer was applied before ventilation to promote assimilation. (b) using artificial pollination or hormone treatment. Artificial pollination should be performed before 9:00 a.m. on sunny days. The male flowers that were in full bloom in the day should be taken off, and the petals should be torn off. The entire stamens should be directly on the stigma of the female flowers for artificial pollination. The 2,4-D smears from 2010-6 to 4010-6 can also be used. The fruit can also be sprayed with gibberellin 8010-6 to 15010-6, which also has good flowering and fruit protection effects.
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