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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Poplar > Holes in leaves or parts of leaves missing

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Poplar > Leaves > Holes in leaves or parts of leaves missing

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  • Image: Forest tent caterpillar 1
  • Image: Forest tent caterpillar 2
  • Image: Forest tent caterpillar 3

Forest tent caterpillar
Malacosoma disstria

  • Larvae chew entire sections of leaves, defoliating branches and trees when populations are high
  • Blue and black with characteristic footprint shaped white markings on top of body
  • Damage occurs May and June
  • More information on Forest tent caterpillar...
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  • Image: Whitemarked tussock moth 1
  • Image: Whitemarked tussock moth 2
  • Image: Whitemarked tussock moth 3

Whitemarked tussock moth
Orygia leucostigma

  • Young larvae windowpane feed (i.e. feed on one layer of leaf tissue between veins) giving them a lacelike
  • Older larvae consume entire leaves except the midrib and large veins
  • Caterpillars have a red-orange head with two sets of black tufts near the head; yellowish hairy body with distinct tufts of hair resembling a toothbrush on top of the body
  • Full grown larvae are 1 ¼ inches long
  • Damage by 2 generations, first from May to June and a second one from August to September
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  • Image: Redhumped Caterpillar 1
  • Image: Redhumped Caterpillar 2
  • Image: Redhumped Caterpillar 3

Redhumped Caterpillar
Schizura concinna

  • Larva will eat entire leaf, leaving only the
  • Red head and a wavy black, yellow, and white striped body with a red projection (hump) on the thorax behind the head, 1 1/3 inch long when fully grown
  • Occurs in August and September
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  • Image: Cottonwood leaf beetle 1
  • Image: Cottonwood leaf beetle 2
  • Image: Cottonwood leaf beetle 3

Cottonwood leaf beetle
Chrysomela scripta

  • Adults eat leaf margins and create "shot-holes" in leaf tissue
  • Larvae windowpane feed, i.e. feed on the upper leaf surface between the veins
  • Defoliation can occur when populations are high
  • Adults are ¼ inch long with yellow and black stripes
  • Larvae are black when young and have 2 white dots on either side
  • More information on Cottonwood leaf beetle...
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  • Image: Large aspen tortrix 1
  • Image: Large aspen tortrix 2

Large aspen tortrix
Choristoneura conflictana

  • Larvae first drill holes into leaf buds causing holes in leaves
  • Skeletonized leaves are webbed or rolled together in spring
  • In early summer, canopy becomes sparse due to consumed and smaller leaves
  • Larvae are nearly black in color, approximately 3/4 inch long with a black head
  • Quaking aspen is preferred host
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  • Image: Poplar tent maker 1
  • Image: Poplar tent maker 2
  • Image: Poplar tent maker 3

Poplar tent maker
Clostera inclusa

  • Chews entire sections of leaves
  • Leaves strung loosely together with webbing or silk
  • When fully grown, larvae are up to 1 3/15 inch long; four yellow stripes down center of body with yellow lines along side opposite of black lines
  • Damage occurs during spring with a second generation occurring in late summer
  • More information on Poplar tent maker...
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  • Image: Japanese beetle 1
  • Image: Japanese beetle 2
  • Image: Japanese beetle 3

Japanese beetle
Popillia japonica

  • Skeletonizes leaves, i.e. chews leaf tissue between the veins creating a lacelike appearance
  • Attacks are common in sunny locations starting at the top of the plant and working down as they feed
  • Adults are metallic green; bronze wings; white tufts of "hair" along their sides
  • Beetles present as early as late June and are active through September
  • More information on Japanese beetle...

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