Efficacy of the stabilizers of Talaromyces flavus in biological control of sugar beet seedling damping-off disease

Subject Areas : Plant Pests

Sheedeh Mehraban Booshehri ¹ , Laleh Naraghi ² , Mohammad Torabi ³

1 - Former M.Sc. Student Department of Plant Pathology, College of Agriculture, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran.
2 - Assistant Professor, Plant Diseases Research Department, Iranian Research Institute of Plant Protection, Tehran, Iran
3 - Departement of Plant Pathology, College of Agriculture, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

Received: 2014-06-01 Accepted : 2014-09-16 Published : 2014-08-23

Keywords: Biological control, dicycloserin, carboxymethilcellolose, sulfate magnesium, sugar beet seedling damping-off,

Abstract :

In the present study, first the superior bioformulations for Talaromyces flavus,containging some chemical stabilizers were determined by measuring the presentage  of active spores in bioformulations and then their efficacy in biological control of sugar beet seedling damping-off was investigated in greenhouse. An experiment was performed in split plot based on randomized complete block design with four replications in greenhouse. Three inoculum application methods (soil treatment, seed treatment and combination of both methods) were considered as the main factor and eight different inoculum formulations including six superior bioformulations Dicycloserin-TF-Su-K-1,Dicycloserin-TF-Su-K-2,Dicycloserin-TF-Su-K-3, Carboxymethilcellolose-TF-Su-K-2, Sulfate magnesium-TF-Su-K-3 and Nitratesodium-TF-Su-K-2. together with two control treatments (healthy and infected checks) were considered as the sub-factor.The results indicated that the most effective treatments for biological control of sugar beet damping-off were Dicycloserin stabilizer and isolate TF-Su-K-3, separetely. Results of the interaction effects of inoculum application method and inoculum showed that the treatment of Dicycloserin-TF-Su-K-2 applied as soil treatment or as combination of soil and seed treatment resulted in less disease occurrance.