The flowers of atemoya are protogynous.Studies revealed that the anthers dehisced at 6-8pm.Hand-Pollination was very effective in increasing fruit act The way was to take the pollen direcyly from the flowers in anther dehiscence with a brush and then transfer it to other flowers without anther dehiscence.If the anther of the recipient remained in undehiscenceness on hand-pollination day the rate of fruit set world be 94.0% in threeweeks.However,if the anther dehisced a short time after hand pollination the rate of fruut set would be 23.9%,on the same level as the control,18.9%.This showed that stigma lost its receptivity completely shirtly before anther dehiscence.