The Sucker That’s Here and the One That’s Coming: Hemlock Woolly Adelgid and Spotted Lanternfly

Jan 29 2019 - 3:15pm

This presentation will provide an update on the distribution, life cycle and impact of hemlock woolly adelgid.  This invasive pest was not known to be established in Michigan until populations were identified in 2015 in Ottawa and Muskegon Counties.  Detection surveys are continuing and additional HWA populations have been found in Allegan and Oceana Counties. Nearly all infestations are near the Lake Michigan shoreline and the potential influence of Lake Effect weather on HWA winter survival will be addressed.  Hemlock trees in some infested sites have already seriously declined or are dying.  Results to date from insecticide trials underway in west Michigan will be included in the presentation.
Spotted lanternfly is a large, showy planthopper that was first found in southeastern PA in 2014.  Adults are strong fliers and while control efforts are underway, SLF life stages have been collected in five other eastern states as of fall 2018.  It appears inevitable that SLF will find its way into Michigan.  This sap-feeding insect produces an amazing amount of honeydew, which leads to black sooty mold.  While SLF is not a tree-killer like HWA, it can feed on a wide array of hardwood trees ranging from tree-of-heaven to black walnut.  In PA, it has damaged grapes and hops, and could become a serious pest of landscape trees.

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Michigan State University

Deborah G. McCullough, a native of Flagstaff, Arizona, holds graduate degrees in Forestry (M.S., Northern Arizona University) and Entomology (Ph.D., University of Minnesota). She is a Professor with a joint appointment in the Dept. of Entomology and Dept. of Forestry at Michigan State University, with research, extension and teaching responsibilities. Dr. McCullough’s research focuses on the ecology, impacts and management of forest insects, including invasive pests such as emerald ash borer, beech bark disease, and most recently, hemlock woolly adelgid. She works with forest managers, regulatory officials, arborists and private landowners to develop sustainable management strategies to protect forests from damaging populations of forest insects. McCullough has published more than 100 papers about forest insect ecology and management in scientific journals, along with more than 200 extension bulletins and articles. She is a member of the national Forest Research Advisory Committee to USDA, the Michigan Interagency Forest Invasives Committee and frequently provides advice on forest insect management to state, municipal and private landowners.