Interactions between the fungal pathogen Entomophaga maimaiga and the gypsy moth on the Monongahela National Forest
R. M. Turcotte, firstname.lastname@example.org, USDA Forest Service, Northeastern Area, 180 Canfield, Morgantown, WV and Patrick Tobin, email@example.com, USDA Forest Service, Northeastern Research Station, 180 Canfield Street, Morgantown, WV.
We studied the effect of the fungal pathogen Entomophaga maimaiga on
gypsy moth (L.) (Lepidoptera: Lymantriidae) populations at three sites
on the Monongahela National Forest (MNF) in West Virginia in 2003.
Gypsy moth has been established on the MNF since at least 1990, and
each of our study sites were located in an area defoliated by the
gypsy moth in the year prior to this study. E. maimaiga is a fungal
pathogen of the gypsy moth, and epizootics can lead to substantial
gypsy moth mortality. We placed laboratory-reared gypsy moth larvae
on soil collected from each site and measured consequent rates of
infection from E. maimaiga. We also collected resident larvae from
the sites and surveyed them for the presence of E. maimaiga.
Infection rates of laboratory reared larvae ranged from 11-29 %. In
first and second instars, and third and forth instars, infection rates
in field collected larvae ranged from14-20% and 25-100%, respectively.
We were also unable to detect pupae in concurrent surveys at each
site. Despite the lack of pupae, and substantial mortality of gypsy
moth larvae due to E. maimaiga, we still observed appreciable levels
of defoliation in our study sites and in the surrounding areas.
Species 1: Lepidoptera Lymantriidae Lymantriadispar (gypsy Moth) Species 2: Zygomycetes Entomophthorales Entomophagamaimaiga