Reason: Early spring summer squash cultivation in a greenhouse is prone to stop fruit expansion, yellowing, and wilting in the middle. Finally, it becomes dry and shriveled. This symptom may appear before and after flowering, commonly known as Huagua. The reasons for chemical melon are as follows: 1. Cultivation in early spring, the assimilation function of leaves is decreased, and the photosynthetic accumulation of plants is low. 2. Because zucchini is a cross-pollinated vegetable, pollen growth is stunted under low temperature and high humidity, and it is not easy to emit pollen. The female flower cannot accept pollen fertilization, which leads to melon. 3. Cultivation in greenhouses in early spring, affected by low temperature and short daylight, causes zucchini to bloom more female flowers and fewer male flowers, which results in poor pollination and squash. Under low temperature, some varieties of pollen are not fully developed, which can also cause melons.
Control: First of all, we must cultivate robust plants to promote plant growth and development. Secondly, it is necessary to control the night temperature and prevent the night temperature from being too high to reduce respiratory consumption; at the same time, apply carbon dioxide fertilizer before ventilation to promote assimilation. The third is to use artificial pollination or hormone treatment. Artificial pollination should be carried out before 9 o'clock in the morning on a sunny day. Pick off the male flowers that bloom that day, tear off the petals, and place the entire stamen directly on the stigma of the male flowers for artificial pollination.
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