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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCE (UNIVERSITY OF TABRIZ)   2007 , Volume 17 , Number 3; Page(s) 197 To 208.
 
Paper: 

EFFECTIVENESS OF TRICHODERMA ISOLATES, MUSTARD FLOUR AND TWO BIOLOGIC COMMERCIAL PRODUCTS FOR BIOCONTROL OF WHEAT TAKE-ALL

 
 
Author(s):  MEHRABI KOUSHKI A.*, ZAFARI D.M., ROUHANI H., GHALANDAR M.
 
* AGRICULTURE JAHAD ORGANIZATION OF MARKAZI PROVINCE, IRAN
 
Abstract: 

Wheat take-all, caused by Gaeumannomyces graminis var tricid, has been observed in recent years in different areas of Iran. Current biocontrol studies have confirmed the effectiveness of the Trichoderma species against many fungal phytopathogens. In this study, biocontrol effects of Trichodermaisolates were evaluated against take-all pathogen. Five isolates of T virens T65, T virims T90, T virens T96, T virens T122 and T koningii T77 were used as isolates that were screened by antifungal tests against take-all pathogen in laboratory and three isolates of TrichodermakonongiopsisT149, T brevicompactumT146 and TrichodermaviridecensT150 were used as random selection. Also, Trichodermin B and Subtilin as commercial products of biocontrol and mustard flour as organic agent that control common bunt were used in order to evaluate biocontrol effects against take-all in greenhouse. In dual culture tests, five isolates namely T65, T90, T96, T122 and T77 covered and overgrowth the colony of the pathogen. This is followed with hyphal coiling (mycoparasitism) for isolates of T65, T96 and T90. In culture filtrate and volatile metabolite tests, all of the isolates differently reduced mycelial growth of take-all pathogen. In greenhouse tests, TreatmentsT96, T65, mixture of eight isolates and Trichodermin B, showed more biocontrol effectiveness than other treatments which reduced 25- 55 percent disease severity,and increased 27-59 percent dry weight of shoots and 23-58 percent dry weight of roots than infected control. Seed treatment was more effective than soil treatment. Based on shoots and roots dry weight, all of the treatments showed significant differences than positive control (p<0.05)and reduced 21-37 percent shoots dry weight and 27-44 percent roots dry weight in the best biocontrol effectiveness against disease to be prompted by biocontrol effects of T96, T65, mixture of eight isolates and trichodermin B.

 
Keyword(s): BIOCONTROL, METABOLITE, MYCOPARASITISM, TAKE-ALL, TRICHODERMA
 
References: 
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