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Fungicide Resistance in Botrytis in Danish Strawberry Production
Erwerbs-Obstbau ( IF 1.3 ) Pub Date : 2021-01-11 , DOI: 10.1007/s10341-021-00541-1
Bent J. Nielsen , Nauja L. Jensen , Peter Hartvig , Louise Hjelmroth , Roland W. S. Weber

A fungicide resistance survey of Botrytis populations in Danish strawberry fields was conducted in 2015 to 2019. Among 594 isolates from 46 fields under integrated pest management, 40% were resistant to fenhexamid, 76% to QoI fungicides, 57% to boscalid and 59% to anilinopyrimidines. These resistance levels were higher than in Northern Germany during the same period, reflecting the more frequent use of the corresponding commercial fungicides in Denmark. In contrast, resistance to fludioxonil (21%) was lower in Denmark than in Northern Germany. Fungicide resistance generally increased with the age of strawberry fields. Isolates with multiple resistance to the registered fungicides were more likely than sensitive isolates to possess resistance also to iprodione and thiophanate-methyl, two fungicides which were no longer used in Denmark during the sampling period. This coupling of resistance to current and old fungicides is interpreted as evidence of a differentiation of Botrytis populations into strains with enhanced and reduced competence to develop fungicide resistance. In order to retard resistance development, adjustments to Danish fungicide registration for strawberries are recommended. Further, non-chemical control methods such as removing infected fruit at harvest should be implemented.



中文翻译:

丹麦草莓生产中葡萄孢菌的抗杀菌性

葡萄孢的抗药性调查在2015年至2019年间对丹麦草莓田进行了种群调查。在经过病虫害综合治理的46个田地中,有594株分离出的菌株中,有40%的菌株对苯六胺具有抗性,对QoI杀菌剂具有76%的抗药性,对Boscalid的抗药性为57%,对苯胺嘧啶的抗药性为59%。在同一时期,这些抗药性水平高于德国北部,这反映了在丹麦更频繁地使用相应的商业杀菌剂。相比之下,丹麦对氟狄莫尼的耐药性(21%)低于德国北部。杀菌剂的抗性一般随草莓田的年龄而增加。对注册的杀菌剂具有多重抗性的菌株比敏感的菌株更可能对异丙苯二酮和甲基托布津具有抗性,这两种杀菌剂在采样期间在丹麦不再使用。葡萄孢菌种群发展成具有增强和降低的能力以产生抗药性的菌株。为了延缓抗药性的发展,建议对丹麦的草莓杀菌剂进行调整。此外,应实施非化学控制方法,例如在收获时去除受感染的水果。

更新日期:2021-01-11
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