Abstract
In 2010–2012, a to talof 309 isolates of Botrytis cinerea from 23 lettuce fields in Northern Germany was examined for sensitivity to seven fungicides with specific modes of action. Resistance against the frequently used compounds boscalid (45.0% of all isolates), iprodione (37.2%) and quinone-out-side inhibitors (strobilurins, 56.3%) was the most common. Isolates combining resistance to two or all three of these fungicides were more frequent than those showing resistance against only one. Strains with cyprodinil (31.4%) or thiophanate-methyl (11.6%) resistance were also observed in the majority of fields. In contrast, resistance against fludioxonil (1 isolate) and fenhexamid (3 isolates) was rare. The abundance of B. cinerea strains with multiple resistance to several currently used fungicides has implications for future lettuce crop management which are discussed.
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