نوع مقاله : کامل علمی - پژوهشی
نویسندگان
1 مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی
2 مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی کرمان ، ایران
3 مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی کرمان ، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Sugar beet roots and attached soil are usually transferred to sugar factories for processing ,then the roots are washed by pressurized water. Muddy water as waste flows in canal and is used to irrigate fields. The possibility of occurrence and fluctuations of the pathogenic organisms in waste were studied in 2005. The samples were collected from waste water once a week. Isolation of pathogens was done by a) citrus leaf baiting method and on PARPH selective medium, and common culture media such as PDA, CMA, MA, NA and WA, b) irrigation of sugar beet seedlings with waste water, c) bioassay with healthy sugar beet roots and d) cysts of nematode extracted from waste by sieves. Different pathogens were isolated from waste such as Fusarium oxysporum, Fusarium sp., Rhizopus stolonifer, Penicillium spp., Aspergillus spp., Pythium aphanidermatum Pythiumsp., Phytophthoracryptogea,Ph.drechsleri,Mucorsp. Rhizoctonia solani,Geotrichum sp., Erwinia carotovora and cysts of Heterodera schachtii. Pathogencity tests were done for each pathogen. At early periods of processing, recovered populations of Pythiaceae and Erwinia carotovora were high, and in the last weeks of processing period population ofPenicillium spp., Aspergillus spp., Mucor sp. and Geotrichum sp. Were in high levels. Populations of Alternariaalternata، Rhizoctoniasolani and Fusariumspp. were stable and cysts of Heterodera schachtii were variable during processing period. These pathogens were also isolated from fields of sugar beet irrigated with waste water.
کلیدواژه‌ها [English]
)