. Bulletin of the Department of Agriculture. Agriculture. JW?"¥Wt» Contribution from Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER October 4,1917 COLLECTION OF WEEVILS AND INFESTED SQUARES AS A MEANS OF CONTROL OF THE COTTON-BOLL WEEVIL IN THE MISSISSIPPI DELTA. By B. R. Coad and T. F. McGehee, Entomological Assistants, Southern Field Crop Insect Investigations. CONTENTS. Page. General statement of experiments conducted. 1 Brief review of 1915 experiments 2 Lines of investigation in 1916 3 Time interval between bag-and-hoop collec- tions in relation t
. Bulletin of the Department of Agriculture. Agriculture. JW?"¥Wt» Contribution from Bureau of Entomology L. O. HOWARD, Chief. Washington, D. C. PROFESSIONAL PAPER October 4,1917 COLLECTION OF WEEVILS AND INFESTED SQUARES AS A MEANS OF CONTROL OF THE COTTON-BOLL WEEVIL IN THE MISSISSIPPI DELTA. By B. R. Coad and T. F. McGehee, Entomological Assistants, Southern Field Crop Insect Investigations. CONTENTS. Page. General statement of experiments conducted. 1 Brief review of 1915 experiments 2 Lines of investigation in 1916 3 Time interval between bag-and-hoop collec- tions in relation to proportion of infested forms secured 3 Plat tests of the value of the bag-and-hoop as a means of weevil control under field con- ditions 18 Experiment on Hecla Plantation 18 Eureka Plantation experiment number 1 27 Studies on the value of a mechanical collector of boll weevils 37 Plat test 38 Comparative efficiency studies 41 General considerations and summary 42 GENERAL STATEMENT OF EXPERIMENTS CONDUCTED. During the cotton-growing seasons of 1915 and 1916 the writers conducted a series of studies to ascertain the value of various meth- ods of collecting boll weevils and infested cotton forms as a means of control for the cotton-boll weevil. The experimental work was conducted in the vicinity of Tallulah, La., while more or less ex- tensive observations were made at various points throughout Lou- isiana and Mississippi. The following studies apply most directly to the conditions existing in what is termed the "Delta" of Louisiana and Mississippi, but are also undoubtedly applicable to other por- tions of the cotton belt where a severe weevil infestation prevails. In July, 1916, the senior writer published a preliminary report on the results of the 1915 studies x in order to place the information secured in a form available for use by the planters. Note.—This bulletin will be of interest to entomologists and to cotton growers in the Delta region of Louisiana. !Co
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