湖北省罗田县是我国甜柿的主要原产地，尤其以该县七道河乡最集中，有３０～１００年生以上的植株近万株，常年产量约５００ｔ。但从１９８５年开始，出现严重的异常落果，产量迅速减少，１９９３年仅产４ｔ。为探明异常落果的原因和找出解决方法，笔者自１９９４年起进行了本 Luotian County of Hubei Province is the main origin of sweet persimmon in our country, especially the most concentrated in the county seven rural, with 30 to 100 years old plants nearly ten thousand, the annual output of about 500t. However, beginning in 1985, there was a grave anomalous drop in output, which was rapidly reduced. In 1993, only 4 tons were produced. In order to find out the cause of the abnormal fallout and find the solution, the author has carried out the book since 1994