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Vermont Invasives

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Winter Moth

Operophtera brumata

  • Read more about Winter Moth
  • Winter moth: larva.
  • Winter moth: larva.
  • Winter moth: eggs.
  • Winter moth: adult.
  • Winter moth: damage.
  • Winter moth: damage.
  • Winter moth: damage.
  • Winter moth: larvae.

White Pine Blister Rust

Cronartium ribicola

  • Read more about White Pine Blister Rust
  • White pine blister rust: flagging, browning of pine needles.
  • White pine blister rust: spore stage on stem of sapling.
  • White pine blister rust: flagging, browning of pine needles.
  • White pine blister rust: spore stage on stem of sapling.
  • White pine blister rust: canker on a young white pine.
  • White pine blister rust: current leaf showing signs of white pine blister rust.
  • White pine blister rust: cushions under the bark in spring.

Thousand Cankers Disease

Geosmithia morbida sp. nov

  • Read more about Thousand Cankers Disease

Sirex Woodwasp

Sirex noctilio

  • Read more about Sirex Woodwasp

Pear Thrips

Taeniothrips inconsequens

  • Read more about Pear Thrips
  • Pear thrips: feeding causes leaves to be dwarfed, mottled yellow to green-brown, and distorted. Pear thrips feeding causes leaves to be dwarfed, mottled yellow to green-brown, and distorted.
  • Pear thrips: adult insect.

Oak Wilt

Bretziella fagacearum

  • Read more about Oak Wilt
  • Oak wilt: wilting leaves are often discolored along outer edges, with discoloration ranging from pale green to yellow, bronze, or brown.
  • Oak wilt: wilting leaves are often discolored along outer edges, with discoloration ranging from pale green to yellow, bronze, or brown.
  • Oak wilt: wilting leaves are often discolored along outer edges, with discoloration ranging from pale green to yellow, bronze, or brown.
  • Oak wilt: vertical cracks indicate the presence of spore mats under the bark.
  • Oak wilt: spore mat under bark.
  • Oak wilt: fruiting bodies, just under the bark of an oak tree.
  • Oak wilt: infected trees may drop leaves rapidly in July or early August.
  • Oak wilt: leaves may fall while they are still green or partly green.
  • Look-alike: anthracnose is a common fungal disease of shade trees that results in leaf spots, cupping or curling of leaves and early leaf drop.
  • Look-alike: anthracnose is a common fungal disease of shade trees that results in leaf spots, cupping or curling of leaves and early leaf drop.

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.

Butternut Canker

Sirococcus clavigignenti-juglandacearum

  • Read more about Butternut Canker
  • Butternut canker: spores of the fungus enter the tree and create cankers that are elongated, sunken, often with an inky black center and whitish margin.
  • Butternut canker: spores of the fungus enter the tree and create cankers that are elongated, sunken, often with an inky black center and whitish margin.
  • Butternut canker: spores of the fungus enter the tree and create cankers that are elongated, sunken, often with an inky black center and whitish margin.
  • Butternut canker: stained wood and scarring of outer bark.
  • Butternut canker: outer bark becomes loose, revealing oval shapes of stained wood.
  • Butternut canker: cankers often ooze sap from beneath the bark.
  • Butternut canker: stained wood beneath bark.

Pagination

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Site by Tamarack Media Cooperative. Cover image by Brian Leedy.