title: Fungal endophytes of grasses and their effects on an insect herbivore.
abstract: The effects of endophytic fungi (Tribe Balansiae, Clavicipitaceae, Ascomycetes) of grasses on an insect herbivore were studied by feeding paired groups of larvae of the fall armyworm (Spodoptera frugiperda, Noctuidae, Lepidoptera) leaves from either infected or uninfected individuals. Perennial ryegrass infected by "the Lolium endophyte", tall fescue infected by Epichloe typhina, dallisgrass infected by Myriogenospora atramentosa, Texas wintergrass infected by Atkinsonella hypoxylon, and sandbur infected by Balansia obtecta were utilized. The endophytes of ryegrass and fescue previously have been shown to be toxic to mammalian herbivores and to deter feeding of some insect herbivores. In this study we extend the antiherbivore properties of those endophytes to the fall armyworm and demonstrate that fungal endophytes in three other genera have similar antiherbivore properties. For most grasses, survival and weights of fall armyworm larvae fed infected leaves were significantly lower and larval duration was significantly longer compared to larvae fed uninfected leaves. Resistance to herbivores may provide a selective advantage to endophyte-infected grasses in natural populations.
authors.affiliation: Department of Botany, Louisiana State University, 70803, Baton Rouge, LA, USA.
authors.forename: Keith
authors.initials: K
authors.lastname: Clay
authors.affiliation: Department of Entomology, Louisiana State Agricultural Experiment Station, Louisiana State University Agricultural Center, 70803, Baton Rouge, LA, USA.
authors.forename: Tad N
authors.initials: TN
authors.lastname: Hardy
authors.affiliation: Department of Entomology, Louisiana State Agricultural Experiment Station, Louisiana State University Agricultural Center, 70803, Baton Rouge, LA, USA.
authors.forename: Abner M
authors.initials: AM
authors.lastname: Hammond