Causes and countermeasures of cucurbit melon in greenhouse in early spring

Summer squash cultivation in greenhouse in early spring, easy to appear fruit expansion midway stop, yellowing, wilting. Finally, it becomes shriveled, and this symptom may occur before and after flowering, commonly known as melons. The reasons for melons are as follows: 1. Early spring cultivation, leaf assimilation function decreased, plant photosynthetic accumulation less. 2. Because zucchini is a cross-pollinated vegetable, pollen development is poor under low temperature and high humidity, and it is not easy to distribute pollen. Female flowers cannot accept pollen fertilization and lead to melons. 3. Greenhouse cultivation in early spring, affected by low temperature and short sunshine, leads to more female flowers and less male flowers in zucchini, thus causing poor pollination and melons. Some varieties of low temperature pollen development is incomplete, will also cause melons. Control methods: First of all, to cultivate healthy plants, promote the growth and development of plants. Secondly, it is necessary to control the night temperature to prevent the night temperature from being too high to reduce respiratory consumption; at the same time, carbon dioxide fertilizer should be applied before ventilation to promote assimilation. Third, artificial pollination or hormone treatment. Artificial pollination should be carried out before 9 a.m. on a sunny day. The male flowers in full bloom on that day should be picked off, the petals torn off, and the whole stamens placed directly on the stigma of the male flowers for artificial pollination.