Why does zucchini turn into melons?

Zucchini melon is the most common problem in zucchini cultivation. Four days after the female flowers bloomed, the young melon apex turned green to yellow, thinned and softened, the apex atrophied, the fruit did not expand, and finally rotted or fell off. Xihulu melon is generally caused by uncomfortable environmental conditions and imbalance of nutrient supply, which is mainly manifested in the following aspects.

1. Poor pollination. Zucchini is a cross-pollinated crop, which requires very strict environmental conditions during flowering. When female flowers bloom, if the temperature is lower than 15 ℃ or the humidity is too high, poor pollination will lead to melons.

two。 It's too sturdy. There are too many female flowers in ①, such as greenhouse zucchini in winter and spring and zucchini in spring. The seedling stage is in the condition of low temperature and short day, which is beneficial to the differentiation and formation of female flowers and produce more young melons. Some varieties of ② have strong knot strength, and there are many young melons, even more melons in one section. Melons are caused by too many young melons and competing for nutrition with each other.

3. The temperature is uncomfortable. The optimum temperature for the growth and development of zucchini is 18 Mel 25 ℃. If the temperature is too high, especially when the night temperature is higher than 15 ℃ for a long time, the respiration will be enhanced, the nutrient consumption will increase, and the accumulation of nutrients in the fruit will be weakened, resulting in melons. If the temperature is too low, photosynthesis and root absorption capacity will be reduced, resulting in insufficient nutrition.

4. The planting density is too high. The planting density was too high, the roots competed with each other for nutrients in the soil, the leaves competed for space light, and the root absorption rate and photosynthetic cooperation rate were greatly reduced, resulting in lack of nutrition.

5. Harmful gas hazard. In greenhouse zucchini cultivation, if organic fertilizer or available nitrogen fertilizer is not applied properly, or sulfur powder is mistakenly fumigated for sterilization, harmful gases such as NH3, NO2 and SO2 are often produced. When harmful gases accumulate to a certain extent, zucchini will appear damage symptoms and cause melons.

6. The plant grows in vain. If the temperature in the greenhouse is higher, especially at night, lack of light, too much water and fertilizer, and too much nitrogen fertilizer, it is easy to cause zucchini to grow too much, lead to excessive vegetative growth, and inhibit reproductive growth, resulting in melons.

7. The harm of gray mold. Zucchini Botrytis cinerea invades the failed flowers, grows a grayish-brown mildew layer, and then infects the young melons, which will quickly soften and shrink and turn into melons.

8. It is not timely to pick melons. If the zucchini is not harvested in time after maturity, the commercial melon grows too big, which will affect the plant growth and the absorption of nutrients by newborn young melons, and new young melons are easy to turn into melons.