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Sensitivity to silthiofam, tebuconazole and difenoconazole of Gaeumannomyces graminis var. tritici isolates from China
Author(s) -
Yun Yingzi,
Yu Fangwei,
Wang Ning,
Chen Huaigu,
Yin Yanni,
Ma Zhonghua
Publication year - 2012
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3277
Subject(s) - tebuconazole , biology , fungicide , take all , agronomy , pathogen , resistance (ecology) , microbiology and biotechnology , veterinary medicine , fungus , botany , medicine
BACKGROUND: Wheat take‐all caused by Gaeumannomyces graminis var. tritici ( Ggt ) has become an emerging threat to wheat production in the last few years. Silthiofam is very effective against Ggt, and recently it has been widely used for the control of take‐all in China. However, farmers have noted a decline in control efficacy with this compound in some wheat fields, suggesting that the pathogen may have developed resistance to silthiofam. RESULTS: Of the 66 Ggt isolates collected from different locations in China, 27 were resistant to silthiofam. There was no cross‐resistance between silthiofam and tecuconazole or difenoconazole. The effectiveness of silthiofam in controlling take‐all was compromised on wheat inoculated with silthiofam‐resistant isolates. Based on the DNA fingerprinting generated by microsatellite PCR, two predominant genetic clusters were found among these isolates and were clearly associated with the sensitivity to silthiofam. CONCLUSION: Silthiofam has a high risk in the development of resistance in Ggt . Tebuconazole and difenoconazole show great potential for control of take‐all on wheat. Results from this study provide useful information for take‐all control and the management of fungicide resistance. Copyright © 2012 Society of Chemical Industry