Resistance management strategies for dicarboximide fungicides in grapes: results of six years' trial work

Screening of Botrytis cinerea isolates from vineyards in Israel for resistance to fungicides

“…A previous study also failed to document a clear correlation between the proportion of dicarboximide-resistant strains in a vineyard and the performance of these fungicides: a positive correlation between disease incidence and resistance frequency was found only at frequencies of resistance of more than 15%; whereas the high incidence of disease in blocks where resistance was less than 15% was attributed to poor fungicide application (Beever et al 1989). Dicarboximides appeared to be able to control resistant strains when disease was not severe (Beever et al 1989;Löchner et al 1987), and we also observed the relatively high efficacy of iprodione at site 2 in 2008, when incidence of bunch rot was low.…”

Integrated Control of Botrytis Cinerea on Greenhouse Tomatoes

“…The implementation of such strategies may present benefits in terms of production costs (savings in cost of materials as well as labour) and in terms of environmental safety (reduced exposure of growers while spraying and reduced residues on the produce and in the environment). It may also decrease the selection pressure for resistance to fungicides (Gullino and Garibaldi, 1982;L6cher et al, 1987).…”

“…The aim of maintaining satisfactory levels of control in the presence of strains resistant to one of the fungicides used in the alternation, and of preventing an increase in the incidence of resistance, was sometimes achieved for certain combinations of multisite fungicides with dicarboximides or benzimidazoles (e.g. Gullino and Garibaldi, 1982;L6cher et al, 1987;Northover, 1988;Gullino et al, 1989). The implementation of such strategies in the context of greenhouse vegetable production is attractive, but complicated by the small number of chemicals available for control (Gullino and Kuijpers, 1994).…”

“…to several families of fungicides is well documented and the risks of cross-resistance for fungicides belonging to a same chemical family have been extensively studied (Barak and Edgington, 1984;Lorenz, 1988;Smith, 1988; review by Gullino, 1992). Studies have also been conducted to determine the relationship between field efficacy of specific fungicides and the frequency of resistant strains, and to elaborate strategies of alternation or combination of chemicals with different modes of action (Leroux and Clerjeau, 1985;L6cher et al;1987;Lorenz, 1988;Gullino, 1992). The aim of maintaining satisfactory levels of control in the presence of strains resistant to one of the fungicides used in the alternation, and of preventing an increase in the incidence of resistance, was sometimes achieved for certain combinations of multisite fungicides with dicarboximides or benzimidazoles (e.g.…”

Influence of spray schedules on fungicide resistant populations of Botrytis cinerea Pers. on grapevine

“…Failures of dicarboximide fungicides to control grey mould of grape, incited by Botrytis cinerea Pers., have been reported and associated with the presence of dicarboximide-resistant isolates of the pathogen (Leroux and Besselat, 1984;Locher et al, 1987;. Resistance to dicarboximides often developed in strains of B. cinerea already resistant to benzimidazoles (multiple resistance), thus complicating the management of grey mould.…”