Entomophthoroses on Some Aphids (Homoptera: Aphididae) Observed in Bulgaria

S. DRAGANOVA1, G. TRENCHEV2 and R. TOMOV2
1 Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria
2 Forestry University, BG-1756 Sofia, Bulgaria

Abstract

DRAGANOVA, S., G. TRENCHEV and R. TOMOV, 2001. Entomophthoroses on some aphids (Homoptera: Aphididae) observed in Bulgaria. Bulg. J. Agric. Sci., 7: 121-127

Entomopathogenic fungi representatives of Entomophthorales (Zygomycotina) are important as natural enemies regulating population density of numerous plant pests – insects and mites. Perfect synchronization of biological cycles of entomophthoraleans and arthropod hosts, their ability to cause infections that often result in epizootics, make them interesting biocontrol agents. They are known as widespread pathogens but are not well studied in Bulgaria.
In the study it was carried out the results of microbiological analyses to identify pathogens responsible to naturally occurred mycoses observed in populations of the aphids Myzus nicotianae Blackman on turnip, Aphis gossypii Glover and A. nasturcii Kalt. (Homoptera: Aphididae) on turnip, pepper and aubergine. Pathogens were identified by morphology of their structures examined from the dead host already bearing conidia and some of them with resting spores. It is established that the observed mycoses have been caused by representatives of Entomophthorales (Zygomycotina: Zygomycetes) – one species from a family Ancylistaceae Conidiobolus obscurus (Hall and Dunn) Rem. et Keller and three species from a family Entomophthoraceae Entomophthora planchoniana Cornu, Zoophthora subgen. Erynia erinacea Ben – Ze'ev et Kenneth and Zoophthora subgen. Neopandora neoaphidis (Rem. and Hennebert) Balazy. The less part of mycoses was caused by Fusarium spp. (Hyphomycetes, Deuteromycotina).

Key words: mycoses, aphids, Entomophthorales, Conidiobolus obscurus, Entomophthora planchoniana, Zoophthora subgen. Erynia erinacea, Zoophthora subgen. Neopandora neoaphidis