土法防治苹果树腐烂病

每年的春秋季是苹果树腐烂病发病高峰期,几乎所有的果园都有此病发生,如果防治不及时,将会严重影响果树的成活和果品的质量。现将在生产实践中土法防治苹果树腐烂病的方法总结如下：     

构建基于WebGIS的苹果树病害服务系统

以苹果树种植区为研究对象,利用WebGIS技术,建立为果农提供服务的GIS系统。其中,Oracle数据库管理地理空间数据和苹果树病害相关知识的属性数据,采用三层B/S结构,ESRI公司的ArcIMS作为WebGIS开发平台,利用MVC设计模式进行开发系统。系统为用户提供基本的GIS功能、查询和统计分析等服务,帮助果农科学有效地管理果园。     

Responses of ABA and CTK to soil drought in leafless and leafy apple tree

The authors tested the contents of ABA (abscisic acid), ZR (zeatin riboside), DHZR (dihydrozeatin riboside) and iPA (isopentenyl adenosine) in leafless and leafy apple trees (Red Fuji/Malus micromalus Makino) during soil drought stress. ABA concentration in drought stressed leafless trees increased significantly compared to the controls. ABA both in roots and xylem rose steadily in the earlier drought stage, reaching a maximum of 1.46 +/- 0.35 nmol g(-1) FW and 117 nmol l(-1) after the 8th day. Similar change patterns of ABA concentration was observed in the leafy trees during soil drought stress; ABA concentrations in roots and xylem sap increased and reached the maximum in the first three days; after 8th day, it decreased slightly, whereas leaf ABA concentration increased steadily in drought stressed plants throughout the duration of the experiment. Between drought stressed and control trees, no significant differences were observed in concentration of ZR and DHZR in both leafless and leafy trees; whereas iPA concentration of the drought stressed leafless and leafy plants decreased markedly in the later stage of drought. These results showed that endogenous ABA originated mainly from the roots in the earlier drought stage, and mainly from the leaves in the later drought stage. Total CTK showed no reduction in the earlier drought stage and decreased in the later drought stage.     

治腐灵治疗苹果树腐烂病药效试验

经１９９３─—１９９５年田间试验表明，治腐灵对苹果树腐烂病的防治效果为：病株减退率７８．６％，病块减退率９０％，抑制复发效果达９７．８％，新生愈合组织平均宽为１．５ｃｍ左右。     

栽植密度对山前平地新红星苹果树体生长及早果早丰的影响

栽植密度是影响新红星苹果树体生长和早果早丰的重要因子。经过连续７年对所试验的１ｍ×４ｍ，１．５×３．５ｍ，１．５ｍ×４ｍ，２ｍ×３ｍ，２ｍ×４ｍ五个栽植密度的调查研究认为：新红星苹果在河北省北部山区株距以１．５～２ｍ，行距以３．５～４ｍ较为合适，其树体大小、株间交接和行间间隔较易控制，早果早丰性强，产量也较高。