. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 265 m- _ _ . ^8-; OV^ISJ-4, Contribution from the Bureau of Entomology L. O. HOWARD, Chief. jr&f^Pu-u Washington, D. C. PROFESSIONAL PAPER December 29,1916 THE DOCK FALSE-WORM: AN APPLE PEST. By E. J. Newcomer, Scientific Assistant, Deciduous Fruit Insect investigations. CONTENTS. Introduction History Distribution Food plants Character of injury to apple; Economic importance Page. 1 2 3 1 5 6 Description and habits. Natural enemies. Remedial measures Summary - Page. 8 10 33 35 37 Bibli
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 265 m- _ _ . ^8-; OV^ISJ-4, Contribution from the Bureau of Entomology L. O. HOWARD, Chief. jr&f^Pu-u Washington, D. C. PROFESSIONAL PAPER December 29,1916 THE DOCK FALSE-WORM: AN APPLE PEST. By E. J. Newcomer, Scientific Assistant, Deciduous Fruit Insect investigations. CONTENTS. Introduction History Distribution Food plants Character of injury to apple; Economic importance Page. 1 2 3 1 5 6 Description and habits. Natural enemies. Remedial measures Summary - Page. 8 10 33 35 37 Bibliography 38 INTRODUCTION. The dock false-worm is the larva of an allantine sawflv (Ametastegia glabrata Fallen) which may be called the dock sawflv. It has long been known, both in Europe and America, as an enemy of dock, sorrel, and knotweed, all common and sometimes troublesome plants which are to be found growing in moist places everywhere. Its acquired habit of boring into mature apples on the tree, to hibernate, thereby destroying their market value, brings it into prominence as an economic pest and has been noted by several observers in this country. Fletcher, in 1903 (30, 3D1 and 1904 (33), reported finding the larva of a sawfly, which proved to be this species, boring into apples in Ontario in rather large numbers, and (36) mentions the presence of these green worms in apples from New York, in 1908. Prof. A. L. Nlelander, of the Washington Experiment Station, in a letter to the Bureau of Entomology, under date of November 1, 1912, report, having known of the fruil-burrowing habit of this larva in British Columbia and since 1903 in Washington, particularly at Lynden, Whatcom County, where the injury amounted to about 1() per cent. i Ki. Br to Bibliography, p. 38 39, .â -i »⢠B ill. ." i 16âI. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of the
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