Laboratory investigations on the effect of systemic fungicides on infection and production of conidia by aphid infecting entomophthoraceae zygomycetes in cereal aphids
Laboratory investigations on the effect of systemic fungicides on infection and production of conidia by aphid infecting entomophthoraceae zygomycetes in cereal aphids
Zimmermann, G.
Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 85(8-9): 513-524
1978
Investigations were carried out to test the effect of several systemic fungicides (Calixin, DuPont benomyl, Cercobin-M, Imugan, Milstem, Plantvax and Saprol) on infection and production of conidia of the 2 aphid-infecting Entomophthora species E. aphidis and E. thaxteriana in the cereal aphids Metopolophium dihbodum and Macrosiphum (Sitobium) avenae. Successive application of fungicides and Entomophthora conidia on aphids resulted in different degrees of inhibition of infection by all pesticides tested. The mortality rate usually caused by E. aphidis was reduced by 18-59%; using a different method, mortality due to E. thaxteriana was lowered by 8-21% as compared with the untreated control. Spraying of fungicides days before the application of Entomophthora conidia did not cause any significant inhibition of infection except Plantvax on E. thaxteriana. After dipping aphids infected with E. aphidis in suspensions of fungicides, the production of conidia was impaired. Cercobin M was best tolerated by the 2 Entomophthora spp.