Efficacy of Seed Treatments With Some Fungicides Against Bean Root Rot Caused By Rhizoctonia solani

Abstract

This study evaluated the effect of some fungicides on emergence, disease severity and seedling growth of bean plants against root rot disease of bean caused by Rhizoctonia solani.  Among the seed treatment fungicides, sedaxane was the most effective fungicide, which increased the emergence of bean seeds at a rate of 93.33% and yielded a 44% decrease in disease severity compared with those of pathogen-inoculated control. Similarly, fungicides with fludioxonil and azoxystrobin active ingredients yielded 86.67% and 73.33% increase in emergence, and a 32% and 30.67% decrease in disease severity, respectively. The fungicides with trifloxystrobin and difenocanozole active ingredients were moderately effective and prevented 18.67% and 20 % of disease severity, respectively. However, the fungicides with thiram, acibenzolar-s-methyl and propineb active ingredients have no effect on emergence and disease severity. The fungicides with sedaxane, fludioxonil and azoxystrobin active ingredients have similar effect on seedling growth compared with the growth the control seedlings. The result showed that fungicides alone or combination applications will be beneficial to reduce yield losses, caused by Rhizoctonia root rot on bean.

Keywords

• Bean,fungicide,disease control,Rhizoctonia solani,seed treatment

Fasulyede Rhizoctonia solani’nin Neden Olduğu Kök Çürüklüğüne Karşı Tohuma Bazı Fungisit Uygulamalarının Etkinliği

Öz

Fasulyede Rhizoctonia solani’nin neden olduğu kök çürüklüğüne karşı bazı fungisitlerin çıkış oranı, hastalık şiddeti ve bitki gelişimi üzerindeki etkisi bu çalışma kapsamında değerlendirilmiştir. Tohum ilacı olarak kullanılan fungisitler arasında sedaxane en etkili fungisit olup, patojenle inokuleli kontrol uygulamalarına göre çıkış oranını %93.33 seviyesinde artırdığı,  hastalık şiddetini ise %44 oranında engellediği tespit edilmiştir. Benzer şekilde fludioxonil ve azoxystrobin etkili maddeli fungisit uygulamalarındaki çıkış oranının sırasıyla %86.67 ve %73.33 olduğu, hastalık şiddetinin ise %32.00 ve %30.67 oranlarında azaldığı belirlenmiştir. Trifloxystrobin ve difenocanozole etkili maddeli fungisitler ise orta derecede etkili olup, hastalık şiddetini sırasıyla %18.67 ve %20.00 oranlarında engellemişlerdir. Bununla birlikte thiram, acibenzolar-s-methyl ve propineb etkili maddeli fungisitlerin çıkış oranı ve hastalık şiddeti üzerinde etkili olmadıkları tespit edilmiştir. Bitki gelişimi açısından da sedaxane, fludioxonil ve azoxystrobin etkili maddeli fungisitlerin kontrole yakın bir gelişim sağladıkları gözlemlenmiştir. Bu kapsamda bu fungisitlerin tek başına yada kombinasyon uygulamalarının fasulyede bu hastalığın neden olduğu kayıpların azaltılması açısından faydalı olacağı düşünülmektedir.

Anahtar Kelimeler

• Fasulye,fungisit,hastalık kontrolü,Rhizoctonia solani,tohum ilaçlaması

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