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Vermont Invasives

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Swallowwort, Black

Cynanchum louiseae

  • Read more about Swallowwort, Black
  • Black swallowwort: small, dark, star-shaped flowers.
  • Black swallowwort: small, dark, star-shaped flowers.
  • Black swallowwort: small, dark, star-shaped flowers.
  • Black swallowwort: leaves are opposite, dark green, oval, and shiny with entire margins. Leaves are from 3-4 in. long and 2-3 in. wide. A short petiole attaches the leaf to the vine.
  • Black swallowwort: fruit are pods, similar to milkweed pods, which are slender, 2-3 in. long and split to reveal small seeds with tufts of white hairs.
  • Black swallowwort: fruit are pods, similar to milkweed pods, which are slender, 2-3 in. long and split to reveal small seeds with tufts of white hairs.
  • Black swallowwort: fruit are pods, similar to milkweed pods, which are slender, 2-3 in. long and split to reveal small seeds with tufts of white hairs.
  • Black swallowwort: fruit are pods, similar to milkweed pods, which are slender, 2-3 in. long and split to reveal small seeds with tufts of white hairs.
  • Black swallowwort: infestation.
  • Look-alike: pale swallowwort (also an invasive species) flower petals are longer than they are wide, and are pale pink to burgundy in color.

Autumn Olive

Elaeagnus umbellata

  • Read more about Autumn Olive
  • Autumn olive: alternate long oval leaves, with silvery undersides, and slight wave to the edge.
  • Autumn olive: leaves and flowers
  • Autumn olive: small, yellowish tubular flowers are abundant and occur in clusters of 5 to 10 near the stems in early summer.
  • Autumn olive: leaves are bright green to gray green above and silver scaly beneath with short petioles.
  • Autumn olive: leaves are bright green to gray green above and silver scaly beneath with short petioles.
  • Autumn olive: thorny branches.
  • Autumn olive: plant form.
  • Autumn olive: fruit is reddish to pink, round, and covered in scales that look like silvery spots.
  • Autumn olive: leaves and fruit.
  • Autumn olive: infestation.
  • Autumn olive: infestation.
  • Look-alike: Russian olive has silvery scales covering both sides of its leaves.

Bittersweet, Asiatic

Celastrus orbiculatus

  • Read more about Bittersweet, Asiatic
  • Asiatic bittersweet: small globose fruits are green when young; ripen to yellow; then split to reveal showy, scarlet berries that persist into winter.
  • Asiatic bittersweet: alternate, elliptical to circular leaves are light green in color and 2-5 in. long.
  • Asiatic bittersweet: small, inconspicuous, axillary, greenish-white flowers bloom from May to early June.
  • Asiatic bittersweet: small globose fruits are green when young; ripen to yellow; then split to reveal showy, scarlet berries that persist into winter.
  • Asiatic bittersweet: small globose fruits are green when young; ripen to yellow; then split to reveal showy, scarlet berries that persist into winter.
  • Asiatic bittersweet: small globose fruits are green when young; ripen to yellow; then split to reveal showy, scarlet berries that persist into winter.
  • Asiatic bittersweet: woody vine that climbs saplings and trees and can grow over 60 feet in length.
  • Asiatic bittersweet: woody vine that climbs saplings and trees and can grow over 60 feet in length.
  • Asiatic bittersweet: infestation.
  • Asiatic bittersweet: infestation.
  • Look-alike: American bittersweet (Celastrus scandens) with terminal fruits.

Elongate Hemlock Scale

Fiorinia externa Ferris

  • Read more about Elongate Hemlock Scale
  • Elongate hemlock scale: yellow-brown scale coverings and light white wool on the underside of the needles.
  • Elongate hemlock scale: yellow-brown scale coverings.
  • Elongate hemlock scale: adult stage of EHS.
  • Look-alike: cryptomeria scale.
  • Look-alike: native hemlock scale.

Dutch Elm Disease

Ophiostoma novo-ulmi

  • Read more about Dutch Elm Disease
  • Dutch elm disease: dead elm.
  • Dutch elm disease: early wilt symptoms of dutch elm disease.
  • Dutch elm disease: spore-bearing bodies of Dutch elm disease.
  • Dutch elm disease: streaking of vascular tissue due to Dutch elm disease.
  • Dutch elm disease: yellowing and wilting of leaves (flagging).
  • Dutch elm disease: bark beetle galleries under elm tree bark.
  • Dutch elm disease: European elm bark beetle galleries.
  • Dutch elm disease: American elm twig with streaking.

Chestnut Blight

Cryphonectria parasitica

  • Read more about Chestnut Blight
  • Chestnut blight: swollen canker near base of tree.
  • Chestnut blight: dieback above canker.
  • Chestnut blight: yellow-orange fungal fruiting bodies.
  • Chestnut blight: Long, orange-yellow tendrils of Cryphonectria parasitica pycnidiospores.
  • Chestnut blight: Yellow-orange, pin head sized fungal fruiting bodies (pycnidia) on the bark and cankers.

Ash Yellows

Candidatus Phytoplasma fraxini

  • Read more about Ash Yellows
  • Ash yellows: witches’ brooms, clusters of upright spindly shoots of leaves on lower trunk.
  • Ash yellows: causes foliage to tuft at the tips.
  • Ash yellows: ash tree dieback.
  • Ash yellows: bark crack and witches brooms.
  • Ash yellows: loss of dominant apical growth pattern.
  • Ash yellows: upturned leaf margins.
  • Look-alike: ash anthracnose.

Hemlock Woolly Adelgid

Adelges tsugae

  • Read more about Hemlock Woolly Adelgid
  • Hemlock woolly adelgid: white, cottony balls at base of hemlock needles.
  • Hemlock woolly adelgid: white, cottony balls at base of hemlock needles.
  • Hemlock woolly adelgid: needles yellow and fall out, leading to crown thinning and tree mortality.
  • Look-alike: spider egg sacs.
  • Look-alike: spittlebug (on a pine tree).
  • Look-alike: hemlock needleminer.

Asian Longhorned Beetle

Anoplophora glabripennis

  • Read more about Asian Longhorned Beetle
  • Asian longhorned beetle: adult beetle with frass.
  • Asian longhorned beetle: perfectly round, dime-sized exit holes - test with a pencil to see that they go deeper into the tree than a tap hole.
  • Asian longhorned beetle: adults have long, black and white banded antennae.
  • Asian longhorned beetle: tunnels created by ALB larvae.
  • Asian longhorned beetle: frass.
  • Asian longhorned beetle: oviposition site (where female deposits egg).
  • Look-alike: white-spotted sawyer, has a distinctive white spot at the top of where its wing covers ("elytra") meet.

Pruning Workshop

  • Read more about Pruning Workshop
Saturday, July 9, 2016 - 6:00am
  • Workshop
Free pruning workshop with VJ Comai, Arborist Representative with the Bartlett Tree Expert Company

Pagination

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