Impact of an Invasive Insect and Plant Defense on a Native Forest Defoliator
AbstractEastern hemlock (Tsuga canadensis [L.] Carriére) in the United States is threatened by the invasive hemlock woolly adelgid (Adelges tsugae Annand). The native hemlock looper (Lambdina fiscellaria Guenée) also appears to have played a role in previous population declines of this conifer. Although these two insects co-occur in much of the adelgid’s invaded range, their interactions remain unstudied. We assessed looper performance and preference on both uninfested and adelgid-infested foliage from adelgid-susceptible hemlocks, as well as on uninfested foliage from an eastern hemlock that is naturally adelgid-resistant. Larvae reared on uninfested foliage from adelgid-susceptible hemlocks experienced 60% mortality within the first two weeks of the experiment, and pupated at a lower weight than larvae fed adelgid-infested foliage. Despite differences in foliage source, this first look and strong pattern suggests that the hemlock looper performs better (pupates earlier, weighs more) on adelgid-infested foliage. In addition, trends suggested that larvae reared on foliage from the adelgid-resistant tree survived better, pupated earlier, and weighed more than in the other treatments. Larvae preferred adelgid-resistant over adelgid-susceptible foliage. Our results suggest that looper perform slightly better on adelgid-infested foliage and that plant resistance to xylem-feeding adelgid may increase susceptibility to foliar-feeding looper larvae. View Full-Text
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Wilson, C.M.; Vendettuoli, J.F.; Orwig, D.A.; Preisser, E.L. Impact of an Invasive Insect and Plant Defense on a Native Forest Defoliator. Insects 2016, 7, 45.
Wilson CM, Vendettuoli JF, Orwig DA, Preisser EL. Impact of an Invasive Insect and Plant Defense on a Native Forest Defoliator. Insects. 2016; 7(3):45.Chicago/Turabian Style
Wilson, Claire M.; Vendettuoli, Justin F.; Orwig, David A.; Preisser, Evan L. 2016. "Impact of an Invasive Insect and Plant Defense on a Native Forest Defoliator." Insects 7, no. 3: 45.
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