Effect of the association of certain fungicides with calcium chloride on the development of several fungi responsible for apple rot in conservation
The use of benomyl and thiabendazole (chemical family of the benzimidazoles), and of azoxystrobine and pyrimethanil shows that, in vitro as much as in vivo, these fungicides are slightly to moderately effective against the following pathogens: Rhizopus stolonifer, Penicillium expansum, Aspergillus niger, A. fumigatus, Alternaria alternata, Cladosporium herbarum, Fusarium oxysporum, Saccharomyces cerevisiae, Monilia fructigina, Cryptosporiopsis malicorticis, Spilocaea pomi and Trichothecium roseum. In vitro, calcium chloride used at more than 4% is tolerated by these pathogens. In vivo and at low temperature, calcium chloride is effective at 4 to 6%. The association of these fungicides with calcium chloride (4%) allows a better control of apple rot in conservation. Calcium chloride appears to intervene by reinforcing the bonds with the principal sites of action of fungicides of the pathogenic agent tested.