. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jr^r^?U"t. Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. V November 4, 1921 WALNUT HUSK-MAGGOT,1 By Feed E. Brooks, Entomologist, Fruit Insect Investigations. Introduction Brief description of insect and in- jury _ Synonymy Distribution Food plants CONTENTS. Page. 1 Description of life stages Activities of the flies Nature of injury Natural enemies 2 Methods of control. 3 Page. INTRODUCTION. The larva of the walnut husk-maggot has long been known to persons who in autumn hav
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jr^r^?U"t. Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. V November 4, 1921 WALNUT HUSK-MAGGOT,1 By Feed E. Brooks, Entomologist, Fruit Insect Investigations. Introduction Brief description of insect and in- jury _ Synonymy Distribution Food plants CONTENTS. Page. 1 Description of life stages Activities of the flies Nature of injury Natural enemies 2 Methods of control. 3 Page. INTRODUCTION. The larva of the walnut husk-maggot has long been known to persons who in autumn have engaged in hulling the nuts of our native black walnut (Juglams nigra). Soon after the nuts drop, a large percentage of them are frequently found with the hulls black- ened and slimy within and containing multitudes of whitish mag- gots which move actively through the soft pulp. Such infested nuts are disagreeable to handle, and in hulling the husk sticks to the inner shell, leaving, it dirty and unattractive in appearance (PI. IV, d). Inasmuch as the fruit of the black walnut was not important commercially in the past this insect did not attract especial attention, and very few persons, even of those who were familiar with the mag- gots in the walnuts, ever saw the parent fly. If seen, it was probably seldom regarded as being in any way connected with the disgusting 1 Rhdgoletis suavis Loew : order Diptera, family Trypetidae. A closely allied species, Rhagoletis juglandis Cresson, has been recorded as attacking the nuts of Juglans rupestris and J. regia in Arizona, and Texas. Several members of the same genus have attracted considerable attention in North America on account of the destructiveness of the larvae to various kinds of fruit. R. pomonella Walsh, known commonly as the apple maggot or railroad worm, is an important; pest of apples in the northern part of the United States and Canada. Two species, R. cingulatu Loew and R. fausta O. S., attack cherries over practicall
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