. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE i) No. 261. Contribution from the Bureau of Entomology, L. O. Howard, Chief. 5 July 19, 1915. (PROFESSIONAL PAPER.) AMERICAN PLUM By E. B. Blakeslee, Entomological Assistant, Deciduous Fruit Insect Investigations. CONTENTS. Introduction 1 History 2 Distribution 2 Food plants 3 Feeding habits and character of injury 3 Description of stages 3 The egg 3 The larva 4 The pupa 4 The adult 4 Spring pupation of wintering larva? 5 Page, E mergence of spring brood of moths 6 Oviposition of first generatio
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE i) No. 261. Contribution from the Bureau of Entomology, L. O. Howard, Chief. 5 July 19, 1915. (PROFESSIONAL PAPER.) AMERICAN PLUM By E. B. Blakeslee, Entomological Assistant, Deciduous Fruit Insect Investigations. CONTENTS. Introduction 1 History 2 Distribution 2 Food plants 3 Feeding habits and character of injury 3 Description of stages 3 The egg 3 The larva 4 The pupa 4 The adult 4 Spring pupation of wintering larva? 5 Page, E mergence of spring brood of moths 6 Oviposition of first generation of moths 7 Length of life of moths of spring brood 9 Habits of the moths 9 Incubation of first-brood eggs 10 First-brood larvae 10 Hibernation 11 Natural enemies 12 Remedial measures 12 Bibliography 13 INTRODUCTION. In the summer of 1912, while engaged in deciduous fruit insect investigations at Winchester, Va., the writer's attention was attracted by the common occurrence upon apple of the American plum borer, Euzophera semifuneralis Walk. Although injury to fruit trees by the larvae of this insect was recorded by Forbes in Illinois as early as 1890, very little has since been published concerning it. This lack of attention may be attributed to the fact that though common and widely distributed it has never occurred in sufficient numbers or been sufficiently destructive to call upon it any special notice as an economic species. The food habits of this insect are particularly interesting when contrasted with those of other wood-boring species. It is also an in- : that under certain conditions is capable of doing considerable damage to trees which have been injured either mechanically or by the attacks of fungous diseases. At the suggestion and under the direction of Mr. A. L. Quaintance, of the Bureau of Entomology, :,n attempt was made, therefore, in the. summer of 1913 and 191-1, to -iudy the insecl - biology. For the photographs presented in this paper the writer is indebt
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