. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SU^'^mTU Washington, D. C. PROFESSIONAL PAPER August 2, 1915. RECENT STUDIES OF THE MEXICAN COTTON BOLL WEEVIL. By B. R. Coad, Entomological Assistant, Southern Field Crop Insect Investigations. CONTENTS. Page. Introduction 1 Distribution 2 Food plants 3 Characteristics of the adult -1 Longevity of adult weevils a Sex of adul ts 10 Reproduction 10 Development Hibernation Natural control Behavior of Louisiana weevils at Development of Thurbcria thespcsioidcs Examination of Thurberia bolls 1'age. 27 31 31 32
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SU^'^mTU Washington, D. C. PROFESSIONAL PAPER August 2, 1915. RECENT STUDIES OF THE MEXICAN COTTON BOLL WEEVIL. By B. R. Coad, Entomological Assistant, Southern Field Crop Insect Investigations. CONTENTS. Page. Introduction 1 Distribution 2 Food plants 3 Characteristics of the adult -1 Longevity of adult weevils a Sex of adul ts 10 Reproduction 10 Development Hibernation Natural control Behavior of Louisiana weevils at Development of Thurbcria thespcsioidcs Examination of Thurberia bolls 1'age. 27 31 31 32 33 33 INTRODUCTION. The cotton season of 1913 was of great importance in the study of the boll weevil, Anthon- omus grandis Boh., because of severaloppor tune discov- eries. Briefly, the events of the year were the dis- covery, by Mr. O. F. Cook, of the cotton boll weevil breeding upon a wild- cotton plant, Thurberia thespesioides, in Arizona; the establishment of breed- ing work at Victoria, Tex., for the purpose of study- ing any changes in the life history of the weevil; the discovery by the writer of important food adapta- tions of the weevil; ex- plorations of southeastern Arizona by Dr. A. W. Morrill and Mr. W. D. Pierce in August, by Mr. Vernon Bailey later in the fall, and by Messrs. Fig. 1.—Distribution of the Mexican cotton boll weevil. The shading shows the infested area; the heavy lines, the limits of cotton production; the broken line, the probable distribu- tion of the Arizona wild cotton weevil. (Original.) Note.—This bulletin is of interest to entomologists in the cotton belt. 89032°—Bull. 231—15 1. 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 Dept. : Supt. of Docs. , G. P. O.
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