. Bulletin of the Department of Agriculture. Agriculture. Washington, D. C. June 30, 1917 SOLID-STREAM SPRAYING AGAINST THE GIPSY MOTH AND THE BROWN-TAIL MOTH IN NEW ENGLAND. By L. H. WoRTHLEY, Agent in Charge of Scouting and Extermination Work, Gipsy and Brotvn-Tail Moth Investigations. CONTENTS. Introduction 1 History 1 Description of apparatus 3 The engine 4 The hose 4 Nozzles 5 Motor-track sprayer 6 Poison 7 Mixing poison 8 Agitation 8 Amount of solution to be used 8 9 Experiment to determine the distribution of poison on foliage 10 Shade-tree spraying 11 Woodland spraying
. Bulletin of the Department of Agriculture. Agriculture. Washington, D. C. June 30, 1917 SOLID-STREAM SPRAYING AGAINST THE GIPSY MOTH AND THE BROWN-TAIL MOTH IN NEW ENGLAND. By L. H. WoRTHLEY, Agent in Charge of Scouting and Extermination Work, Gipsy and Brotvn-Tail Moth Investigations. CONTENTS. Introduction 1 History 1 Description of apparatus 3 The engine 4 The hose 4 Nozzles 5 Motor-track sprayer 6 Poison 7 Mixing poison 8 Agitation 8 Amount of solution to be used 8 9 Experiment to determine the distribution of poison on foliage 10 Shade-tree spraying 11 Woodland spraying 12 M'inter care of spraying machines and equip- ment 13 Summary 14 INTRODUCTION. In nearly all parts of the ITnited States damage is produced each year by leaf-eating insects, and the application of arsenicals, in the form of poison sprays, has been demonstrated to be the most efficient method of suppression or control. In the work of suppressing and preventing the spread of the gipsy moth and the brown-tail moth, spraying with arsenate of lead on an extensive scale has proved a very important factor. The magnitude of the insect problem which the ravages of the gipsy moth has developed in the New England States made it necessary to devise extensive improvements in insecti- cides and spraying machinery. HISTORY. Wlien the work against the gipsy moth was first undertaken by the Commonwealth of Massachusetts, the problem was one of ex- termination rather than repression, and spraying with arsenical 63392°—Bull. 480—17. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
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