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

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

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  • Image: Walnut caterpillar 1
  • Image: Walnut caterpillar 2
  • Image: Walnut caterpillar 3

Walnut 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
  • Image: Yellownecked caterpillar 2
  • Image: Yellownecked caterpillar 3

Yellownecked 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
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  • Image: Gypsy moth 1
  • Image: Gypsy moth 2
  • Image: Gypsy moth 3

Gypsy 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
  • More information on Gypsy moth...

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