Variable performance of bird cherry-oat aphid on Neotyphodium-infected tall fescue from Tunisia
DOI:
https://doi.org/10.33584/rps.13.2006.3156Abstract
The extent of Neotyphodium based resistance in wild fescue to bird cherry-oat aphid (Rhopalosiphum padi) was determined by quantifying densities of this aphid on a series of Neotyphodiuminfected (E+) and uninfected (E-) tall fescue entries. Little or no aphid survival was observed on E+ 'Kentucky 31' tall fescue and three E+ wild tall fescue accessions (16079, 15978, 16075) from Tunisia; however, three E+ Tunisia accessions (16036, 16044, 16085) supported populations of R. padi. These results suggest that wild tall fescue from Tunisia harbour diverse Neotyphodium endophytes. They also support earlier observations by entomologists that the magnitude of insect (including aphids) resistance in E+ grasses varies with the host genotype and Neotyphodium strain involved in the interaction. Keywords: Neotyphodium endophyte, tall fescue, Rhopalosiphum padi, host plant resistance
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