Occurrence of entomopathogenic fungi in populations of Rhopalosiphum padi (L.) aphids feeding on primary and secondary host plants

摘要

The dynamics of the bird cherry-oat aphid Rhopalosiphum padi (L.) on the primary host in 2007-2009 was characterized by a rapid increase in the first half of May and a sharp decline in the population in the second half of this month. The autumn remigration of R. padi on the primary host, began in the first decade of September, and the most gender morphs of aphids were found in the second decade of September. No fungal infections were found among the founders of the R. padi on bird cherry in spring whereas in thefundatrigeniae populations, three species of entomopathogenic fungi were recorded: Conidiobolus obscurus, Entomophthora planchoniana and Pandora neoaphidis. Autumn observations revealed that the infections occurring in the populations of R. padi were caused by the same three entomophthoralean fungal species, and additionally by Neozygitesfresenii. During the feeding of R. padi on cereals, the presence of the four aforementioned entomophthoralean fungi (Entomophthoromycota) and Lecanicilliummuscarium, representing the anemorphs of hypocrealean Ascomycota, was recorded.