枣树缩果病的发生规律研究

对枣缩果病的发生情况进行了调查。结果表明:缩果病的发生在不同品种、不同气候、不同土壤类型、不同管理水平等因素之间存在着一定差异。在陕北缩果病只有1个发病期,8月初开始显症,8月下旬达到高发期。在同一枣园,缩果病呈逐年加重趋势;以木枣发病最轻,7月鲜发病最重,其余品种轻重依次排序为晋枣、蜂蜜罐、赞皇大枣、狗头枣、梨枣、骏枣;夏季持续干旱高温及其随后的降雨使缩果病发生严重;含石砾的沙质土枣园,缩果病发生重于黄土上所建枣园。施入化肥的枣园缩果病发生重于施农家肥的枣园。

Regularity of Occurrence on Jujube-fruit Shrink Disease

Occurrence regularities of jujube-fruit shrink disease(JFSD) were investigated.The results showed that there were certain differences among different cultivars,climates,soil types and management levels.The disease occurred only one period in a year in northern Shaanxi: the symptom appeared in early August and the high-incidence season was at the last ten days of August.The rate of infected fruit was increased year by year in the same orchard.The susceptibility of Zizyphus jujube Mill.cv."Muzao" was the lightest,followed by "Jinzao","Fengmiguan","Zanhuangdazao","Goutouzao","Lizao","Junzao",and "Qiyuexian".The disease occurred seriously under the conditions of sustained high temperature especially subsequent rainfall.The disease at the orchard with sandy soil was more serious than that with loess.The disease at the orchard applied with fertilizer was more serious than that with farmyard manure and scientific management was useful to control the disease.