Il existe une grande disparité dans l'activité des différents fongicides sur la croissance mycélienne des 3 espèces d'Entomophthorales. Certains fongicides sont peu ou pas actifs (chlorothalonil, éthirimol, oxychlorure de cuivre, soufre, etc.), d'autres agissent moyennement (captafol, dichlofluanide, mancozèbe, thirame, etc.); d'autres encore se révèlent très toxiques (bénodanil, chinométhionate, chloronèbe, triarimol). Mais il n'est pas simple de classer les fongicides en fonction de leur activité; un bon nombre d'entre eux possède un comportement hétérogène devant les 3 souches (carbendazime, oxycarboxine, 26019 RP, etc.). Dans l'ensemble, les fongicides systémiques se montrent plus efficaces sur la croissance mycélienne que les non systémiques.

The examination of growth was conducted in test tubes and five fungicidal concentrations were tested. The amount of growth of the various fungi in all treatments was expressed as a percentage of the growth of the control in order to evaluate the concentrations which reduce the growth speed by half.

In the increasing order of their sensitivity to fungicides the strains under study could be classified in the following manner:B. ranarum, E. virulenta andC. osmodes.

There is a great disparity between the action of the different fungicides upon the mycelial growth of the 3 Entomophthorales species. Some fungicides have little or no action (chlorothalonil, ethirimol, copper oxychloride, sulphur, etc.); others are more or less active (captafol, dichlofluanid, mancozeb, thiram, etc.); others again showthemselves to be highly toxic (benodanil, quinomethionate, chloroneb, triarimol). However it is not simple to classify the fungicides as a function of their activity; many of them react differently on the 3 species (carbendazim, oxycarboxin, 26019 RP, etc.). Overall, systemic fungicides are more effective on mycelial growth than non-systemic fungicides.