一品红根腐性病害及防治技术研究

Study on the Roots rot Diseases of Euphorbia Pulcherrima Willd and Their Control

室内病原分离、纯化及鉴定结果表明,一品红根腐性病害致病菌主要包括8种。其中立枯丝核菌(Rhizocto niasolaniKukn)分离比率占51.2%,寄生疫霉和烟草疫霉、腐霉菌次之。多数致病菌主要通过栽培基质进行传播侵染,因此进行基质消毒为重要的防病手段。利用"必速灭"颗粒剂进行拌土消毒灭菌效果可达70.5%。不同药剂对一品红根腐病不同病原菌菌丝生长抑制效果差异较大;通过灌根与喷雾结合防治的手段,利用恶霉灵等多种有效药剂单独或混合用药,可起到诸病兼治的作用。

The results isolation,purification and determination of Dothogens showed that the roots rot diseases were caused by 8 Pothogenous organisms.Among these Rhizoctonia solani Kukn was 51.2%,Phutophtora Parasitica Dast,Phutophtora Nicotianae Breda and Phthium Spp came second. The chemical treatment of substrata was the most important controlling method because that most Pothogenous fungi and bacteria mainlu disseminated by substrata .The controlling effet by treating substrata with 'Bisumie'could be 70.5%.The fungistatic effects of the experimental fungicides against different pothogenous fungi differed greatly.The methods by drenching roots and spraying the same or other fungicide ordeny or combinedly,for example Hymexazol could be control the diseases caused by all the Pothogenous fungi and bacteria.