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Effets de Traitements Fongicides aux Imides Cycliques sur les Populations de Sclerotinia minor dans le Sol
Author(s) -
Davlt P.,
Martin C.
Publication year - 1985
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1985.tb00784.x
Subject(s) - vinclozolin , fungicide , iprodione , biology , benomyl , botany
About the effects of cyclic imides fungicidal treatments on soil populations of Sclerotinia minor When S minor selerotia were incubated in natural soils, they were gradually attacked by a varied antagonistic flora. This phenomenon was seriously slackened when cyclic imides (iprodione of vinclozolin) at 25 or 50 mg.l ‐1 were incorporated into the soil, in laboratory trials or in normal conditions of cultivation. These fungicides (which are currently used to control S. minor ) seemed to protect selerotia by preventing the development of antagonistic fungi. Selerotial germination was inhibited by vinclozolin but, if the duration of contact was less than 5 weeks, the phenomenon was fully reversible, even in the presence of very high concentrations (500 mg.l ‐1 ). When an inoculum of Trichoderma sp. was added to natural soils, selerotia were rapidly damaged. An even faster decrease of S. minor populations resulted from the incorporation of cyclic imides into these Trichoderma‐enriched soils. These organisms are not very susceptible to such fungicides. It is suggested that a joint utilization of these biological auxiliaries and of cyclic imides should be a way to avoid the appearance of a biological unbalance due to an exclusive use of fungicides.