Some characteristics of Botrytis cinerea isolates tolerant to procymidone

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Abstract
Of 104 isolates of Botrytis cinerea collected from greenhouses in south‐east Spain, 70 (67%) were tolerant to procymidone. The tolerant isolates appeared as often in greenhouses treated with dicarboximides for only 1 year as in those treated for several years, indicating a rapid development of tolerance under greenhouse conditions. Although the tolerant isolates grew more slowly on PDA than the sensitive ones, their sporulation per unit area was similar. The sporulation and the viability of conidia of tolerant isolates collected in greenhouses where dicarboximides were used for 3 years were enhanced by the presence of procymidone in the growth medium, features that may have important epidemiological implications.