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Crab Apple > Leaves > Holes in leaves or parts of leaves missing

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  • Image: Eastern Tent Caterpillar 1
    Credit: Robert L. Anderson, USDA Forest Service, Bugwood.org
  • Image: Eastern Tent Caterpillar 2

    Credit: J. Hahn, University of Minnesota

  • Image: Eastern Tent Caterpillar 3

    Credit: Terry Price, Georgia Forestry Commission, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowEastern Tent Caterpillar
Malacosoma americanum

  • Larvae feed on leaves, sometimes defoliating trees
  • They make a web or “tent” in the fork of the branches
  • Larvae are hairy with blue, black, and orange markings, and a white stripe down the back, almost 2 inches when full grown
  • Present during May and June
  • More information on Eastern Tent Caterpillar...
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  • Image: Forest Tent Caterpillar 1
    Credit: Ronald S. Kelley, Vermont Department of Forests, Parks and Recreation, Bugwood.org
  • Image: Forest Tent Caterpillar 2

    Credit: Kenneth E. Gibson, USDA Forest Service, Bugwood.org

  • Image: Forest Tent Caterpillar 3

    Credit: Steven Katovich, USDA Forest Service, Bugwood.org

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green arrowForest Tent Caterpillar
Malacosoma disstria

  • Chews entire sections of leaves, often leaving some major veins; defoliation can be severe
  • Hairs along sides of body, blue and black with characteristic footprint shaped white markings on top of body, almost 2 inches long when fully grown
  • Occurs in May and June
  • More information on Forest Tent Caterpillar ...
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  • Image: Cankerworms 1
    Credit: USDA Forest Service - Ogden Archive, USDA Forest Service, Bugwood.org
  • Image: Cankerworms 2

    Credit: James B. Hanson, USDA Forest Service, Bugwood.org

  • Image: Cankerworms 3

    Credit: J. Hahn, Univ. of Minnesota

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green arrowCankerworms
Paleacrita vernata and Alsophila pometaria

  • Chews smalls holes between veins at first, later chewing leaf tissue except for major veins, and eventually chewing all of leaves except midvein
  • Defoliation typically light to moderate, although it can potentially be severe
  • Smooth-bodied, light green to brown, 1 1/3 inch long when fully grown; moves in characteristic looping motion
  • Occurs late April/early May until June
  • More information on Cankerworms...
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  • Image: Redhumped Caterpillar 1
    Credit: Lacy L. Hyche, Auburn University, Bugwood.org
  • Image: Redhumped Caterpillar 2

    Credit: Jerry A. Payne, USDA Agricultural Research Service, Bugwood.org

  • Image: Redhumped Caterpillar 3

    Credit: Department of Entomology, U of MN

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green arrowRedhumped Caterpillar
Schizura concinna

  • Larva will eat entire leaf, leaving only the midvein
  • 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
  • More information on Redhumped Caterpillar...
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  • Image: Yellownecked Caterpillar 1
    Credit: Lance S. Risley, William Paterson University, Bugwood.org
  • Image: Yellownecked Caterpillar 2

    Credit: J. Hahn, U of MN

  • Image: Yellownecked Caterpillar 3

    Credit: J. Hahn, U of MN

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green arrowYellownecked Caterpillar
Datana ministra

  • Small larvae skeletonize undersides of leaves; Larger larvae consume all but leaf petioles
  • Black head and a black body with yellowish stripes and a yellowish rectangle behind its head, it is almost 2 inches when fully grown
  • Occurs in August and September
  • More information on Yellownecked Caterpillar...
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  • Image: Fall Webworm 1
    Credit: Lacy L. Hyche, Auburn University, Bugwood.org
  • Image: Fall Webworm 2

    Credit: J. Hahn, U of MN

  • Image: Fall Webworm 3

    Credit: Ministry of Agriculture and Regional Development Archive,
    Ministry of Agriculture and Regional Development, Bugwood.org

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green arrowFall Webworm
Hyphantria cunea

  • Produces silken webbing that covers the ends of branches
  • Chews entire sections of leaves, leaving major veins
  • Yellowish or greenish with long, fine white hairs with two rows of black spots down its back
  • Occurs from late July through September
  • More information on Fall Webworm...
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  • Image: Cecropia 1
    Credit: Herbert A. "Joe" Pase III, Texas Forest Service, Bugwood.org
  • Image: Cecropia 2

    Credit: J. Hahn, U of MN

  • Image: Cecropia 3

    Credit: J. Hahn, U of MN

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green arrowCecropia
Hyalophora cecropia

  • Chews entire sections of leaves; defoliation typically is minor
  • Light green body with double row of reddish orange knobs on thorax behind head; also series of smaller yellow and blue knobs on abdomen; grows up to 4 inches long
  • Becomes a large, attractive moth
  • Occurs in August and September
  • More information on Cecropia...
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  • Image: Obliquebanded Leafroller 1
    Credit: USDA Forest Service - Region 8 Archive, USDA Forest Service, Bugwood.org
  • Image: Obliquebanded Leafroller 2

    Credit: Minnesota Dept. of Agriculture

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green arrowObliquebanded Leafroller
Choristoneura rosaceana

  • Early season larvae feed on the undersurface of a leaf along the midrib or other large vein
  • Early season larvae feed inside bud clusters and developing fruit, resulting in fruit drop or corky scars on the fruit
  • Late season larvae can scar the fruit
  • Larvae are yellow-green and 1” in length when mature
  • Adult moth is reddish-brown with brown bands on the wings
  • More information on Obliquebanded Leafroller...
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  • Image: Redbanded Leafroller 2
    Credit: Minnesota Dept. of Agriculture
  • Image: Redbanded Leafroller 1

    Credit: Clemson University - USDA Cooperative Extension Slide Series, ,
    Bugwood.org

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green arrowRedbanded Leafroller
Argyrotaenia velutinana

  • Larvae skeletonize leaves from the underside, folding and webbing the leaves together
  • Fruit injury is usually shallow with ragged edges and thick, corky tissue over the damaged area
  • Larvae are green with a green head, and reach about ½" at maturityLarvae are yellow-green and 1” in length when mature
  • Larvae are present early May – June
  • Adults have distinct red-brown bands on the forewings that form a V-shape when at rest, and are about ¼" in length

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