المكافحه المتكامله لمرض تقرح ساق البطاطا المتسبب عن الفطر solani Kühn Rhizoctonia تحت الظروف الحقلية

Abstract EN

This study aims to control Pathogen caused stem canker and black scurf on Potato by biological control agent Bacillus subtilis and induced chemical compounds such as Bion and Saliclic acid .It was clear from study that biocontrol B.subtilis treatment ( 5×109 CUF/ml)under field condition and the existing of pathogenic Fungus isolate Rhizoctonia solani (RS1)caused significant decrease in disease incidence and severity which reached 9 ،6 % respectively, compaering with the control treatment (Pathogen Fungus only) which was 80-72% respectively.Also the treatment caused significant decrease in disease inidence and severity by sclerotia which reached 7.0 ، 4.0% respectively comparing with the control treatment which was disease incidence and severity by the secrotia which reached 75، 45% respectively.

Two treatments of integrated control B.subtilis with Bion and B.subtilis with Salicylic acid under field condition and pathogenic Fungus isolate ( RS1 ) caused significant decrease in disease incidence and severity which reached 6.0 , 4.0 , 7.0 , 5.8 % respectively, comparing with the control treatment (Pathogen fungs only ).

and treatments of integrate control B.subtilis with Bion and B.subtilis with Salicylic acid which give 70، 79 Kg tybers respectively comparing with control treatment (Pathogen Fungus only) which give 26 kg tubers.