Abstract
Three systemic fungicides (benomyl, ethirimol and tridemorph) and seven non-systemic ones (captafol, captan, fentin acetate with maneb, mancozeb, maneb, thiram and zineb) at concentrations recommended for field use inhibited germination of conidia of Entomophthora aphidis. All inhibited mycelial growth of the fungus in vitro, and benomyl, fentin acetate with maneb, maneb and thiram killed the fungus. Benomyl, tridemorph and thiram were aphicidal : each of the others, except captafol and zineb, decreased the infectivity of E. aphidis for living pea aphids, 6 h after they were treated topically with the fungicides. Each except captafol, zineb and maneb, was still active when the aphids were inoculated 48 h after treatment. When aphids were inoculated 4 h before treatment with fungicides, each of these except zineb, still decreased the infectivity of the fungus, although fungicide treatment 22 or 70 h after inoculation had little effect. The number of conidia discharged from infected aphid cadavers treated with the fungicides was diminished by benomyl and tridemorph and increased by captafol and captan.
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