. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. J'^^'^^^u SWS''"^^U Washington, D. C. October 16, 1922 THE GIPSY MOTH ON CRANBERRY BOGS. By Charles W. Minott, Oipsy Moth Assistant, Gipsy Moth and Brovyn-tail Moth Investigations, Bureau of Entomology. CONTENTS. Pa KG. Introduction 1 Artificial cranberry bogs 2 How bogs become infested with gipsy motlis. 2 Wind dispersion of gipsy moth, larvae- 3 History 3 Selection of a hog for experi- mental purposes 3 Obsei-vatlons on wind dispersion. 4 Description of traps 5 Record of
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE. J'^^'^^^u SWS''"^^U Washington, D. C. October 16, 1922 THE GIPSY MOTH ON CRANBERRY BOGS. By Charles W. Minott, Oipsy Moth Assistant, Gipsy Moth and Brovyn-tail Moth Investigations, Bureau of Entomology. CONTENTS. Pa KG. Introduction 1 Artificial cranberry bogs 2 How bogs become infested with gipsy motlis. 2 Wind dispersion of gipsy moth, larvae- 3 History 3 Selection of a hog for experi- mental purposes 3 Obsei-vatlons on wind dispersion. 4 Description of traps 5 Record of trap observations 6 Feeding habits on cranberry foliage_ 9 Page. Feeding habits on white oak foliage_ 10 Injury by a given number of larv8e_ 11 Mortality of flrst-stage larvse 12 Recovery of cranberry vines from gipsy moth feeding 13 Methods of control 13 How to detect an infestation __ 13 Control on wet bogs 14 Control on dry bogs 16 Control on uplands 17 Summary 19 INTRODUCTION. While the gipsy moth {Porthetria dispar L.) has been in Mas- sachusetts since 1868, that section of the State in which the cran- berry industry is established was nearly immune from the ravages of this insect until 1913. About this time, however, owing to favorable conditions, the infestation increased very rapidly in the southeastern part of the State, and occasional complaints were heard regarding injury to cranberry bogs in certain sections of Bristol, Barnstable, and Plymouth Counties. These conditions, and the importance of the cranberry industry, were sufficient causes to warrant a study of the habits of the gipsy moth on this new food plant. Under the direction of A. F. Burgess, in charge of moth work in New Eng- land, the writer began a study of the problem in 1916, the results of which are recorded in this bulletin, together with suggestions in 108485'^—22 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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