On the basis of an analysis of current use of terms concerning resistance to fungicides, a series of definitions is proposed for discussion. Consistent use of such terms in scientific publications will facilitate understanding and avoid possible misinterpretations.
In some cucumber and gherkin greenhouses in the Netherlands, where Curamil (a.i. pyrazophos) had been used for control of powdery mildew, unsatisfactory disease control was obtained in recent years. Laboratory tests revealed a decreased sensitivity of the pathogen to the fungicide. The fitness and the competitive ability of pyrazophos resistant strains in absence of the fungicide appeared to be somewhat lower than that of the normal, sensitive strains. The implications with respect to disease control in practice are discussed.
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