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Black Walnut > Leaves > Holes in leaves or parts of leaves missing

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  • Image: Walnut caterpillar 1

    Credit: James Solomon, USDA Forest Service, Bugwood.org

  • Image: Walnut caterpillar 2

    Credit: Ronald F. Billings, Texas Forest Service, Bugwood.org

  • Image: Walnut caterpillar 3

    Credit: Ronald F. Billings, Texas Forest Service, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowWalnut caterpillar
Datana integerrima

  • Young larvae skeletonize the leaf causing a lacelike appearance
  • Mid-sized larvae consume all foliage except for midveins on one branch before moving to another
  • Mature larvae consume all foliage, including the midvein excluding the petiole
  • Larvae up to 2 inches long, yellow stripes running lengthwise on gray to rust red body with long hairs
  • More information on Walnut caterpillar...
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  • Image: Yellownecked caterpillar 1

    Credit: J. Hahn, University of Minnesota

  • Image: Yellownecked caterpillar 2

    Credit: USDA Forest Service - Northeastern Area Archive, Bugwood.org

  • Image: Yellownecked caterpillar 3

    Credit: James Solomon, USDA Forest Service, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowYellownecked caterpillar
Datana ministra

  • Young larvae gregariously (in groups) skeletonize leaves, i.e. eat the leaf tissue between the veins so that it appears lace-like
  • Older larvae are solitary and feed along leaf margins, eventually eating entire leaves, except the petioles
  • Orange yellow rectangular spot behind its head; can be colored either black with orange yellow stripes or orange yellow with red orange stripes; black head; fine white hairs over entire body
  • Lifts head and tail into a "U"
  • Feeding occurs July into September
  • More information on Yellownecked caterpillars...
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  • Image: Gypsy moth 1

    Credit: Tim Tigner, Virginia Dept. of Forestry, Bugwood.org

  • Image: Gypsy moth 2

    Credit: J. H. Ghent, USDA Forest Service, Bugwood.org

  • Image: Gypsy moth 3

    Credit: USDA APHIS PPQ Archive, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowGypsy moth
Lymantria dispar

  • Chew leaves and can defoliate entire trees
  • Mature larvae are 2 inches long; upper side has five pairs of blue dots near front of body followed by six pairs of red dots down the back
  • Damage occurs in June and July
  • Is currently a federally quarantined pest in Minnesota; not established in Minnesota; if found, call Minnesota Dept. of Agriculture at 651-201-6684 or 1-888-545-6684

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