. Bulletin of the Department of Agriculture. Agriculture. JhW^fLru 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 4 Longevity of adult weevils 6 Sex of adults 10 Reproduction 10 Page. Development 27 Hibernation 31 Natural control 31 Behavior of Louisiana weevils at Victoria 32 Development of Thurbcria thespesioidfs 33 Examination of Thurbem bolls 33 INTRODUCTION. T
. Bulletin of the Department of Agriculture. Agriculture. JhW^fLru 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 4 Longevity of adult weevils 6 Sex of adults 10 Reproduction 10 Page. Development 27 Hibernation 31 Natural control 31 Behavior of Louisiana weevils at Victoria 32 Development of Thurbcria thespesioidfs 33 Examination of Thurbem bolls 33 INTRODUCTION. The cotton season of 1913 was of great importance in the study of the boll weevil, Anthon- omus grandis Boh., because ofseveralopportunediscov- 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. and Mr. W. D. Pierce in August, by Mr. Vernon Bailey. 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.) later in the fall, and by Messrs. 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 Department : Supt. of Docs. , Govt. Print. Off.
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