Photos: Lawn / Tree / Ornamental Pests and Critters - Home and Garden IPM from Cooperative Extension - University of Maine Cooperative Extension

Photo Gallery: Lawn, Tree and Ornamental Pests and Critters

: Asiatic Garden Beetle (Maladera formosae) (7/22/2024)

: Asiatic Garden Beetle (Maladera formosae) (North Yarmouth, ME; 8/14/2022)

: Black Vine Weevil (Otiorhynchus sulcatus) (strawberry, raspberry and cranberry pest; rhododendrons are also a host)

: Raspberry Weevil (Otiorhynchus singularis) (found feeding on a rhododendron in central Maine; 5/19/2021)

: Raspberry Weevil (Otiorhynchus singularis) (found feeding on a rhododendron in central Maine; 5/19/2021)

: Raspberry Weevil (also known as the Clay-colored Weevil) (Otiorhynchus singularis) (very similar to the Black Vine Weevil) (this one was found feeding on a rhododendron in central Maine; 5/16/2021)

: Browntail Moth (late instar caterpillar stage)

: Browntail Caterpillars on a crabapple tree in Waterville, Maine; 5/12/2021 (Photo courtesy of Jamie Graves)

: Curve-toothed Geometer (Eutrapela clemataria) (Stetson, ME; 5/17/2021) (larvae feed on the leaves of ash, basswood, birch, elm, fir, maple, poplar, willow, and other trees)

: Dogwood Sawfly Larvae on a dogwood (middle instar stage) (7/17/2020) (Photo courtesy of Susan; Monroe, ME) (compare with adjacent photos of the final two instar stages which are very different)

: Final larval instar of the Dogwood Sawfly (Macremphytus testaceus) (August 9th, 2009; Medway, Maine) (Similar to a White Pine Sawfly larva)

: Dogwood Sawfly larvae [Photo courtesy of Val Libby, Blue Hill (Maine) on 1 Aug. 2021]

: Eastern Ash Bark Beetle (Hylesinus aculeatus) (July 21st, 2021; from firewood in Pittsfield, Maine) (with three phoretic mites hitching a ride on its back)

: A nest of Eastern Tent caterpillars

: A mature Eastern Tent Caterpillar (Central Maine: June 24th)

: Closeup view of an Eastern Tent Caterpillar egg mass

: A nest of Eastern Tent caterpillars

: A nest of Eastern Tent Caterpillars (Mid-May, 2012; Aurora, ME)

: A nest of Eastern Tent caterpillars

: Closer view of the caterpillar nest shown in the adjacent photo

: Closer view of the bottom of the nest shown in the adjacent photo

: A mature Eastern Tent Caterpillar (Central Maine: June 5th, 2015)

: Comparing the Eastern Tent Caterpillar (bottom) with a Forest Tent Caterpillar (above). Both were feeding on the leaves of a wild apple tree. The Eastern tent caterpillars make silken nests in the forks of their host trees whereas the forest tent caterpillars make no nests at all, in spite of having “tent” in their name (Etna, ME; 6/5/2015)

: Euonymus Caterpillars

: Euonymus Caterpillars

: A heavy infestation of the Euonymus caterpillars

: A heavy infestation of Euonymus caterpillars

: European Chafer (adult stage)

: European Chafer (grub and pupa)

: Comparing grubs of European Chafer and Japanese Beetle

: May/June Beetle

: Eastern Boxelder Bug (Boisea trivittata) (adult stage) (Hallowell, ME; 4/19/2021)

: Eastern Boxelder Bug (Boisea trivittata) (adult stage) (Hallowell, ME; 4/19/2021)

: Eastern Hemlock Looper (Lambdina fiscellaria) (resting by a porch light in Stetson, Maine; 9/15/2019)

: Eastern Hemlock Looper (Lambdina fiscellaria) (Farmington, Maine; 9/8/2020) (Photo courtesy of Hannah A.)

: Fall Webworm caterpillar (early stage of development) (these build nests but they are not considered to harm most trees that are generally healthy)

: Fall Webworm (nest and larva)

: Forest Tent Caterpillars
(these do NOT build nests)

: Spongy Moth caterpillar (final instar/mature larva) (Common Name: Spongy Moth)

: A pair of Spongy Moth pupae

: Spongy Moth (Lymantria dispar) (male)

: Spongy Moth (female)

: Hemlock Woolly Adelgid (an invasive pest)

: Pine Needle Scale

: Pine Needle Scale (closer view)

: Introduced Pine Sawfly larva (July, 2015)

: Introduced Pine Sawfly adult (Etna, ME; 4/15/2020)

: Japanese Beetle Larva/Grub

: Japanese Beetle (on a milkweed leaf)

: Azalea Lace Bug adult beside a U.S. penny

: Azalea Lace Bug adult (closer view)

: Azalea Lace Bug nymph

: Signs of Azalea Lace Bug damage to the underside of an azalea leaf

: Closer view of the adjacent photo

: Azalea leaf injury from Azalea Lace Bug

: Lily Leaf Beetle

: Lily Leaf Beetle eggs

: Mealybugs (Family Pseudococcidae)

: Metallic Wood-boring Beetle (Family: Buprestidae)

: Example of the larval stage of a metallic wood-boring beetle (Flatheaded Hardwood Borer) (Photos courtesy of M. O. Metcalf)

: A metallic wood-boring beetle (Flatheaded Hardwood Borer / Dicerca divaricata) (Photo courtesy of M. O. Metcalf)

: Oriental Beetle (Anomala orientalis) on a petunia flower (Old Town, ME; 7/5/2025) (adults feed on most flowering plants but usually with only minimal damage; grub stage feeds on roots of primarily grasses)

: Oriental Beetle (Anomala orientalis) on Queen Anne’s Lace (Turner, ME; 7/21/2023)

: Red-headed Ash Borer (Neoclytus acuminatus) (Jonesboro, ME; 4/11/2022)

: Rose Chafers

: Tawny Garden Slug

: Tawny Garden Slug

: A slug and its trail

: Leopard Slug (also called a Spotted Slug or Giant Garden Slug) (June 1st, 2012) (Northeast Harbor, ME)

: Leopard Slug versus Tawny Garden Slug

: Spruce Budworm (larva)

: Spruce Budworm Larvae

: Spruce Budworm (pupal stage)

: Spruce Budworm

: Sugar Maple Borer (Glycobius speciosus) (6/13/2021; Panton, Vermont — but also found in Maine) (Photo courtesy of M. O. Metcalf)

: Thrips

: Hickory Tussock (the hairs on many tussock caterpillars can cause an itchy rash)

: Tussock caterpillars: Hickory Tussock (top) and Spotted Tussock (bottom).

: Milkweed Tussock Caterpillar (Euchaetes egle) (Etna, ME; 8/23/2009) (this caterpillar is not an invasive species)

: Powderpost Beetle

: Powderpost Beetle covered with some of the fine wood powder from the feeding damage they cause

: Feeding damage from Powderpost Beetles

: Viburnum Leaf Beetle Larvae

: Western Conifer Seed Bug

: Whiteflies

: Whiteflies (adults with wings, immatures, and black/dead ones due to parasitism)

: Whitespotted Sawyer Beetles

: Whitespotted Sawyer Beetle (female); Photo by C. Armstrong

: A female Whitespotted Sawyer Beetle (June 4, 2016; Etna, Maine)

: Whitespotted Sawyer beetle (female)

: Northeastern Pine Sawyer

: Northeastern Pine Sawyer (closer view)

: White Grub damage to a lawn

: White Grub damage to a lawn

: White Grub damage to a lawn

: Comparing the rasters of Japanese Beetle and European Chafer grubs.

: Pupa of a White Grub

: White Grub

: White Pine Weevil

Additional Photos and Information: Asiatic Garden Beetle Azalea Lace Bug Bark Beetles Black Vine Weevil Boxelder Bugs (BugGuide.net) See also: Boxelder Bugs (University of Minnesota Extension) Browntail Moth/Caterpillar Candy-striped Leafhopper Curve-toothed Geometer (BugGuide.net) Dogwood Sawfly (Iowa State Univ Extension) (additional images, including