The Evaluation of the Activity of Some Algae and Their Extracts on the Control of Stem Canker of Potato Caused by Rhizoctonia solani

E. Hasan, Alaa.; Abd Al-Hadi, D.B.; H. Demin, Ali; A.Kamal, Jawad

doi:10.33794/qjas.2015.108690

	The Evaluation of the Activity of Some Algae and Their Extracts on the Control of Stem Canker of Potato Caused by Rhizoctonia solani
Al-Qadisiyah Journal For Agriculture Sciences
Article 1, Volume 5, Issue 2, 2015, Pages 124-133 PDF (0 K)
DOI: 10.33794/qjas.2015.108690
Authors
Alaa. E. Hasan; D.B. Abd al-Hadi; Ali H. Demin; Jawad A.Kamal
Abstract
This study is conducted at laboratories of College of Agriculture- university of Kufa in order to evaluate three algae Microcystis sp., spirulina eplatensis and sarconema sp. and their organic extracts against Rhizoctonia solani pathogen . The antagonistic ability of Microcystis is effective against R.sloni because it gives colony diameter 7mm , with inhibitory percentage 65% , as compared with control which gives 20mm of colony diameter .The results revealed that methanol extract was more effective in reducing the viable cells of R.solani which give 28.66 x 104 CFU/ml as compared to 32.40 x 104 CFU/ml at the control .Viable cells of R.solani are reduced with the application of Microcystis which is 26.46x104 CFU/ml as compare with spirulina platensis and sarconema which give 29.18 and 28.14x 104 CFU/ml respectively . The ethanolic extract of Microcystis sp. has the superiority of reducing colony diameter of R.solani , when gives inhibitory zone 26mm as compared with acetone as an extract of the same alga which gives inhibitory zone 20mm
Keywords
Extract; Algae; Canker; Rhizoctonia solani; Potato

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