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Pine sawflies in the genus    Neodiprion    Rohwer are widely distributed across the Northern Hemisphere and are pests of commercially important conifer trees. While sampling for    Neodiprion    species in eastern North America, two colonies of    Neodiprion   warreni    Ross were discovered in Tennessee feeding on    Pinus   virginiana    Mill. These are the first records of    N.   warreni    in Tennessee and on the host    P.   virginiana   . Here, we use a combination of larval and adult female morphology to confirm species identification. We also discuss two potential explanations for these observations:    N.   warreni    was always present in Tennessee and feeding on    P.   virginiana    but, until now, has gone unreported or these new records are attributable to a recent range expansion and host shift. We also discuss potential economic and evolutionary implications of range expansions and host shifts in plant-feeding insect pest species.

﻿First record of the pine sawfly Neodiprion warreni ( Hymenoptera , Diprionidae ) in the state of Tennessee and on Pinus virginiana

First record of the pine sawfly Neodiprion warreni ( Hymenoptera , Diprionidae ) in the state of Tennessee and on Pinus virginiana