Incidence of benomyl and iprodione resistance in isolates of Botrytis cinerea in tomato crops in England and Wales in 1986

Abstract

In 1986, mass‐mycelial isolates of Botrytis cinerea from 67 tomato crops in England and Wales were examined for benomyl and iprodione resistance. Of the 706 isolates obtained, 62.7% were resistant to benomyl at 2μg/ml and 43.2% were resistant to iprodione at 2 μg/ml. Iprodione resistance persisted in the absence of a dicarboximide spray programme. The incidence of benomyl resistance has not decreased since the last survey in 1984 in spite of a considerable reduction in the use of benzimidazole fungicides. There were no clear indications that the use of dichlofluanid influenced the incidence of benomyl or iprodione resistance. Disease control was poorer in crops with a higher incidence of iprodione resistance.

First report on the use of moderately halophilic bacteria against stem canker of greenhouse tomatoes caused byBotrytis cinerea

“…Recent laboratory studies showed that B. cinerea was highly resistant towards dicarboximide and benzimidazoles, the main anti-Botrytis fungicides used in Tunisia. Furthermore, several investigations conducted all over the world, indicated that chemical control against grey mould of tomatoes was not effective due to the development of resistant strains (Locke and Fletcher, 1988;Yourman and Jeffers, 1999;Rosslenbroich and Stuebler, 2000). Alternative methods for suppressing B. cinerea are therefore needed for commercial growers.…”

Résistance de Botrytis cinerea aux benzimidazoles et aux dicarboximides dans les cultures abritées de tomate en Tunisie

“…La grande majorit6 des auteurs ont fix8 cette dose B 100 ppm, alors que dautres utilisent des doses plus faibles, d'environ 2-5 pprn (Elad et al, 1988;Katan et al, 1989). Cependant, les etudes du comportement 'fitness' des , 1979;Leroux & Gredt, 1982;Locke & Fletcher, 1988;Beever et al, 1989). En se rCfCrant B certains auteurs, qui considtrent une souche comme risistante au bCnomyl si elle est inhibCe ?…”

“…Les dicarboximides ont pns ainsi le relais des benzimidazoles (Leroux & Moncomble, 1993). Ce phknomkne a it6 expliquk par la similitude dans le mode d'action de ce groupe de fongicides (Pappas et al, 1979;Wang et al, 1986;Leroux & Moncomble, 1993). Effectivement, les isolats de B. cinerea testis ont manifest6 une risistance vis-A-vis L'ktude de la germination conidienne de B. cinerea a rivtli une trbs faible activiti du chlozolinate, comparie B celle de l'iprodione.…”

Biological control of Botrytis cinerea on stem wounds with moderately halophilic bacteria

“…Recent laboratory studies have shown that B. cinerea was highly resistant towards dicarboximide and benzimidazoles, the main anti-Botrytis fungicides used in Tunisia. Furthermore, several investigations conducted all over the world have indicated that chemical control against grey mould of tomatoes was not effective, due to the development of resistant strains (Locke and Fletcher 1988;Rosslenbroich and Stuebler 2000;Yourman and Jeffers 1999). Alternative methods for suppressing B. cinerea are therefore needed for commercial growers.…”