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首页> 外文期刊>Plant Disease >Resistance to QoI fungicides in Ascochyta rabiei from chickpea in the Northern Great Plains.
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Resistance to QoI fungicides in Ascochyta rabiei from chickpea in the Northern Great Plains.

机译：大平原北部鹰嘴豆对 Ascochyta rabiei 的QoI杀真菌剂的抗性。

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摘要

Ascochyta blight, caused by Ascochyta rabiei (teleomorph: Didymella rabiei), is an important fungal disease of chickpea (Cicer arietinum). A monitoring program was established in 2005 to determine the sensitivity of A. rabiei isolates to the QoI (strobilurin) fungicides azoxystrobin and pyraclostrobin. A total of 403 isolates of A. rabiei from the Northern Great Plains and the Pacific Northwest were tested. Ninety-eight isolates collected between 2005 and 2007 were tested using an in vitro spore germination assay to determine the effective fungicide concentration at which 50% of conidial germination was inhibited (EC50) for each isolate-fungicide combination. A discriminatory dose of 1 micro g/ml azoxystrobin was established and used to test 305 isolates from 2006 and 2007 for in vitro QoI fungicide sensitivity. Sixty-five percent of isolates collected from North Dakota in 2005, 2006, and 2007 and from Montana in 2007 were found to exhibit a mean 100-fold decrease in sensitivity to both azoxystrobin and pyraclostrobin when compared to sensitive isolates, and were considered to be resistant to azoxystrobin and pyraclostrobin. Under greenhouse conditions, QoI-resistant isolates of A. rabiei caused significantly higher amounts of disease than sensitive isolates on azoxystrobin- or pyraclostrobin-amended plants. These results suggest that disease control may be inadequate at locations where resistant isolates are present.
机译：由 Ascochyta rabiei （teleomorph： Didymella rabiei ）引起的枯萎病是鹰嘴豆（ Carier arietinum ）的一种重要真菌病。 2005年建立了一项监测计划，以确定A的敏感性。 rabiei 分离到QoI（星形胶质蛋白）杀真菌剂嘧菌酯和吡菌酯。总共403个A的分离株。对来自北大平原和西北太平洋的狂犬病进行了测试。使用体外孢子萌发试验测试了2005年至2007年收集的98株分离物，以确定每种分离物-杀菌剂组合在抑制50％的分生孢子萌发时的有效杀菌剂浓度（EC 50 ） 。建立了区分剂量为1微克/毫升的嘧菌酯，并将其用于测试2006年和2007年的305种分离物的体外QoI杀菌剂敏感性。与敏感菌株相比，2005年，2006年和2007年从北达科他州以及2007年从蒙大拿州收集的菌株中有65％表现出对嘧菌酯和吡菌酯的敏感性平均降低100倍，被认为是对嘧菌酯和吡菌酯具有抗性。在温室条件下，耐QoI的A分离株。狂犬病造成的病害数量比用嘧菌酯或吡菌胺酯改良的植物上的敏感菌株高得多。这些结果表明，在存在抗性分离株的地方，疾病控制可能不够充分。

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