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