Some varieties of fruits will not set fruit when planting alone or with certain other varieties of the same fruit . 有些品种单独栽培或与同系统的其他品种混栽，则不结果。
2.
Dissemination of rice water weevil lissorhoptrus oryzophilus kuschel to the coastal area in north of zhejiang province where the single and double cropping rice were mixed cropped 稻水象甲传入浙北沿海水稻单双季混栽区
