. Bulletin of the Department of Agriculture. Agriculture. JTU^"^3L I BULLETIN No. 571 Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER December 15, 1917 THE PECAN LEAF By John B. Gill, Entomological Assistant, Deciduous Fruit Insect Investigations. CONTENTS. Page. Introduction 1 History , 2 Synonymy 3 Distribution 3 Food plants 4 Character of injury 5 Description G Seasonal history and habits S Natural enemies 14 Methods of control 15 Dipping and spraying tests for the de- struction of larvae in hibernation 15 Tage. Me
. Bulletin of the Department of Agriculture. Agriculture. JTU^"^3L I BULLETIN No. 571 Contribution from the Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER December 15, 1917 THE PECAN LEAF By John B. Gill, Entomological Assistant, Deciduous Fruit Insect Investigations. CONTENTS. Page. Introduction 1 History , 2 Synonymy 3 Distribution 3 Food plants 4 Character of injury 5 Description G Seasonal history and habits S Natural enemies 14 Methods of control 15 Dipping and spraying tests for the de- struction of larvae in hibernation 15 Tage. Methods of control—Continued. Spraying experiments for the destruction of larva? in hibernation 16 Spraying experiments against overwin- tered larvae 18 Spraying experiments against larvae in the summer 19 Fumigation experiments against hiber- nating larva? 23 Summary 25 Recommendations for control 26 Literature cited 27 INTRODUCTION. Because of the increasing importance of the pecan industry the Bureau of Entomology in 1913 established a field station at Mon- ticello, Fla., for the purpose of studying pecan insects under the most advantageous conditions. The writer was placed in charge of the investigations", under the direction of Dr. A. L. Quaintance. In the spring of 1914 Mr. A. I. Fabis was detailed to assist in the work of this station. Extensive investigations, covering a period of nearly four years, have shown the value of certain repressive measures for the control of some of the more injurious pecan insects and have resulted in the compilation of considerable data on their life histories and natural enemies. One of the principal insect pests with which the pecan grower has to contend is the pecan leaf case-bearer (Acro- basis nebulella Riley). The present publication is intended to give the information now available concerning the life history and control of this insect. The writer wishes to thank the various pecan growers who have rendered assistance in this wor
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