1; BULLETIN No. 598 
Contribution from the Bureau of Entomology 
L. O. HOWARD. Chie! 
Washington, D. C. PROFESSIONAL PAPER. February 4, 1918 
ORCHARD INJURY BY THE HICKORY TIGER- 
MOTH. 
. By DwicuT IsEty, Scientific Assistant, Deciduous Fruit Insect Investigations. 
CONTENTS. 
Page. Page. 
Introduction...... poo coocccarcoosescsesacbes Ie Seasons! Bhistonya couse cpecuce ce cuss secceroee 7 
BELTS COM Ugee te anata tas sialere niale ivi Saiclelciewies se cicwee JS tabitseiae seamel so 2 cae avecceaacex seme 10 
Mom mornmeanie. Se so ss sos SPE ES AL ESPALASILESE LE. ASAE a eettcitcee Cae aac ne awe 11 
DYNOMMI Wer ae eels CMe voce bacc ces oes see zl PeOnomichmportanceypeeassee eae ceteee ease 12 
PISMIDUROM 22 cc sac eee Mere Riveec ce chsicces Ex CON LTO Peis aS IS Nats ars neurone iaroats ae ere cio 12 
Description o1 stages.....20....cccccecceccees cif eWiterspunercited pets. sear cscte dee ecacecee 3 Is 
MOG LaTtS ese isiais ec ceca de cindciasele ds casale oes 
INTRODUCTION. 
The injurious stage of the hickory tiger-moth, Walisidota caryae 
Harris,’ is a gregarious summer caterpillar (Pls. I, II) which, al- 
though a genera] feeder on deciduous trees and shrubs, causes occa- 
sional injury in orchards of pomaceous fruits and cultivated walnuts. 
While in this respect it is a minor pest, its injury, where it occurs, 
is severe and conspicuous and is the source of frequent inquiries to 
the Bureau of Entomology and to entomologists in the field. The 
writer’s attention was frequently called to the work of this cater- 
pillar while stationed at North East, Pa., during the seasons of 1914, 
1915, and 1916, and there, incidental to the major projects then 
eee investigation, the seasonal history and habits of this insect 
have been studied and the necessary remedial measures determined. 3 
HISTORY. 
Injury by the hickory tiger-moth was first described by Harris in 
3841 (1) in the earliest important work on economic entomology pub- 
1. Order Lepidoptera, family Arctiidae. 
2The writer was assisted in 1915 by E. R. Selkregg and in 1916 by James K. Primm, 
11190°—18 
