Why does the dragon fruit crack as soon as it becomes red?

Pitaya plants are currently entering a period of concentrated flowering. The flowers usually bloom from 1 to 1.5 hours before sunset, and gradually close after dawn, and wither after the sun rises. During this period, flowers complete the process of self-fertilization. However, at present, heavy rain, torrential rain and less sunshine are extremely unfavorable to pollination and fertilization of pitaya. For example, heavy rain dilutes the mucus of female stigma, male flower liquid is washed away, and flowers will wither and fall off without completion of fertilization. In addition, due to more rain at present, the plant absorbs relatively more water, so the speed of flesh development and expansion is not synchronized with the speed of pericarp growth, so fruit cracking also increases. To overcome the above unfavorable factors, it is necessary to adopt facilities for cultivation, such as transparent greenhouse cultivation. If planted in open field, it is difficult to ensure stable yield and high quality when it is not conducive to flowering, pollination and fertilization of plants, and it is not conducive to the emergence of water, light and other factors. It is suggested that you cover the soil with film as much as possible to reduce the water content of the soil and keep the water content of the soil uniform as much as possible; spray 0.04PPM brassinolide on the plants when the weather is clear to improve the stress resistance of the plants; use artificial auxiliary pollination, and collect pollen before the flowers fall in the early morning to stroke the female stigma with a brush; As the concentrated flowering period of pitaya is generally from late June to early July, late August to early September, and from mid-late September to early October, it is suggested to strengthen pollination and fruit setting management in the later periods to make up for the temporary loss.