To definitude the flower with higher fruit set and suitable pollinator for Dangshansu pear with higher rate of fruit without sepal,the effect of pollinator on the fruit set of different flower in an inflorescence and sepal persistence were studied by field experiment with 12 pollinators.

After investigation and analysis in orchard,the peak of calyx dropping was found on 8 th day after full bloom.

Research on photosynthesis of virus-free Fragaria daltoniana;