Walnut Caterpillar Datana Integerrima Order Lepidoptera, Family Notodontidae; Prominents Native Pest

Pests of Trees and Shrubs Walnut caterpillar Datana integerrima Order Lepidoptera, Family Notodontidae; prominents Native pest Host plants: Apple, birch, hickory, honeylocust, oak, pecan, walnut, and willow Description: Moths are stout bodied, approximately 31 mm long with wings folded, have brown forewings with irregular dark cross lines and a wingspan of approximately 50 mm. Larvae are about 50 mm long when mature and black with white hairs. Younger larvae are reddish brown with longitudinal light yellow stripes. Life history: Adults are present during spring and sum- Walnut caterpillar larva. (257) mer, laying eggs on the underside of leaves beginning in Photo: John Davidson June. Larvae are gregarious feeders. Mature larvae drop to the ground to pupate. There are one or two generations a year. Overwintering: Pupae in the soil. Damage symptoms: Young larvae skeletonize leaves, and older larvae consume leaves. Isolated trees and trees in small groups are more subject to attack. High density infestations can lead to complete defoliation, and succes- sive defoliations of two years or more can cause serious injury or tree death. Monitoring: Look for groups of larvae feeding together on terminals, beginning in June. Look later in the summer, for mature larvae feeding along or on the ground under host plants. Physical control: Remove groups of young larvae feeding. Chemical control: Spray light infestations of younger larvae with horticultural oil or Bacillus thuringiensis var. kurstaki. Heavier infestations and older larvae may require the use of a residual insecticide. Biological control: Eggs are attacked by several parasi- toids. The fly, Archytas metallicas, parasitizes the larvae. Plant mortality risk: Low to medium Biorational pesticides: Bacillus thuringiensis var. kurstaki, diflubenzuron, insecticidal soap, pyrethrins, spinosad, tenbufenozide Conventional pesticides: acephate, bifenthrin, carbaryl, chlorpyrifos (nursery only), cyfluthrin, deltamethrin, fluvalinate, lambda-cyhalothrin, malathion, permethrin IPM of Midwest Landscapes 216.

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Notodontidae Datana integerrima Walnut Caterpillar Moth 20 n=0 • • • • High Mt. • • N 10 • •• • u • • • • • m • • • • b • 0 • • e • • • • r 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 • 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 NC counties: 36 • • Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec • o • 20 • • f n=15 • = Sighting or Collection Low Mt. High counts of: • • in NC since 2001 F • = Not seen since 2001 l 10 100 - Tyrrell - 2008-07-23 • i 40 - Wake - 2009-07-24 g Status Rank h 40 - Wake - 2013-07-25 0 NC US NC Global t 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 D Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec a 20 20 t n=48 n=101 e Pd CP s 10 10 0 0 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 15 5 25 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Three periods to each month: 1-10 / 11-20 / 21-31 FAMILY: Notodontidae SUBFAMILY: Phalerinae TRIBE: TAXONOMIC_COMMENTS: One of 16 species in this genus, all but one of which occurs in North America north of Mexico (Miller et al., 2018).
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APPENDIX ONE ILLUSTRATION SOURCES REF. CODE ABR Abrams, L. 1923–1960. Illustrated flora of the Pacific states. Stanford University Press, Stanford, CA. ADD Addisonia. 1916–1964. New York Botanical Garden, New York. Reprinted with permission from Addisonia, vol. 18, plate 579, Copyright © 1933, The New York Botanical Garden. ANDAnderson, E. and Woodson, R.E. 1935. The species of Tradescantia indigenous to the United States. Arnold Arboretum of Harvard University, Cambridge, MA. Reprinted with permission of the Arnold Arboretum of Harvard University. ANN Hollingworth A. 2005. Original illustrations. Published herein by the Botanical Research Institute of Texas, Fort Worth. Artist: Anne Hollingworth. ANO Anonymous. 1821. Medical botany. E. Cox and Sons, London. ARM Annual Rep. Missouri Bot. Gard. 1889–1912. Missouri Botanical Garden, St. Louis. BA1 Bailey, L.H. 1914–1917. The standard cyclopedia of horticulture. The Macmillan Company, New York. BA2 Bailey, L.H. and Bailey, E.Z. 1976. Hortus third: A concise dictionary of plants cultivated in the United States and Canada. Revised and expanded by the staff of the Liberty Hyde Bailey Hortorium. Cornell University. Macmillan Publishing Company, New York. Reprinted with permission from William Crepet and the L.H. Bailey Hortorium. Cornell University. BA3 Bailey, L.H. 1900–1902. Cyclopedia of American horticulture. Macmillan Publishing Company, New York. BB2 Britton, N.L. and Brown, A. 1913. An illustrated flora of the northern United States, Canada and the British posses- sions. Charles Scribner’s Sons, New York. BEA Beal, E.O. and Thieret, J.W. 1986. Aquatic and wetland plants of Kentucky. Kentucky Nature Preserves Commission, Frankfort. Reprinted with permission of Kentucky State Nature Preserves Commission.
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