At present, the weather has entered the summer heat and summer heat, the weather is very hot, sunshine hours long, melon vegetables tend to appear "flowers and not real" phenomenon. Field inspections since July 15 have found that the zucchini planted by individual farmers is "flowerless." The reasons for the occurrence of "flowers but not realities" and preventive measures are as follows: First, the reason: The flower buds of melons belong to "bisexual flower" in the early stage of differentiation. Since then, due to the influence of internal and external factors, they have developed into male flowers, female flowers and bisexual flowers. Male flowers occur at lower nodes, progressing from the base of 3-4 one by one, and there are usually no males in the positions where female flowers are born. Male flowers are generally open earlier than female flowers, but female flowers cultivated at low night temperature conditions open earlier than male flowers. The positions of female flowers on the main vine or lateral vines vary greatly among species, species, and varieties or varieties in the same species. During the nursery, a lower night temperature favors the occurrence of female or bisexual flowers. Some experiments showed that the number of female flowers decreased from 9.6 to 6.3 per plant at night temperatures of 18-26°C, and the number of males increased from 70 per plant to 90 plants per plant. Under normal circumstances, the night temperature is higher than 25 °C. Many melon varieties show only male flowers and no female flowers. In addition, sunshine also affects the sex differentiation of flowers. Most types of melons promote the occurrence of female flowers or bisexual flowers in short days, but in the case of long days, they inhibit female flowers or bisexual flowers and promote male flowers. Therefore, due to long days after entering the midsummer, it is also detrimental to the differentiation of females. Second, preventive measures: 1. Scientific sowing and rational arrangement of planting time. Through a reasonable arrangement of sowing time, to avoid the high-temperature vinegar period in summer and promote the differentiation of hermaphroditic flowers and female flowers. 2, timely water spray in the field, film cultivation. By strengthening field management, reducing field temperatures, reducing sunshine intensity and sunshine duration, and promoting the differentiation of asexual flowers and female flowers. 3. The cultivation of facilities should be reasonably adjusted according to their growth characteristics. Zhejiang ocean family co.,ltd , https://www.ocean-family.com