. Bulletin of the Department of Agriculture. Agriculture. ^*V â¢INSECTS UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 382 ^ju /w^if Contribution from the Bureau of Entomology â »jy, , jfC^T'^Ci. L. O. HOWARD, Chief J^f^^J'U. Washington, D. C. A July 8, 1916 COTTON BOLL-WEEVIL CONTROL IN THE MISSISSIPPI DELTA, WITH SPECIAL REFERENCE TO SQUARE PICK- ING AND WEEVIL PICKING. By B. R. Coad, Entomological Assistant, Southern Field Crop Insect Investigations. INTRODUCTION. In devising measures for the control of the boll weevil the experi- ence of the Bureau of Entomolog}7 has shown that
. Bulletin of the Department of Agriculture. Agriculture. ^*V â¢INSECTS UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 382 ^ju /w^if Contribution from the Bureau of Entomology â »jy, , jfC^T'^Ci. L. O. HOWARD, Chief J^f^^J'U. Washington, D. C. A July 8, 1916 COTTON BOLL-WEEVIL CONTROL IN THE MISSISSIPPI DELTA, WITH SPECIAL REFERENCE TO SQUARE PICK- ING AND WEEVIL PICKING. By B. R. Coad, Entomological Assistant, Southern Field Crop Insect Investigations. INTRODUCTION. In devising measures for the control of the boll weevil the experi- ence of the Bureau of Entomolog}7 has shown that those which are practicable in one region do not necessarily apply in another. The conditions vary according to climate, topography, and systems of agriculture. Each locality offers peculiar conditions, but striking differences occur between the cotton regions of Texas and of the delta of Louisiana and Mississippi. These varying conditions have led to the development of rather distinct methods of control of the weevil, as applied to these two regions. During the progress of the Mexican cotton boll weevil northward and eastward across the State of Texas, a combination of control measures which was reasonably effective in limiting the damage to the cotton crop was devised and adopted. These measures were largely of a more or less indirect nature, such as planting early maturing varieties, frequent shallow cultivation, wide spacing of the plants to allow the sunshine to reach the fallen squares, etc. Largely owing to the comparatively dry climate and the exceedingly high mortality of the weevil stages in the fallen forms, produced by the hot sunshine, these measures generally sufficed for that region. When the weevils invaded the Delta region of the Mississippi River, in the States of Louisiana and Mississippi, however, it was found that weevil control was complicated by new conditions. The extremely heavy rainfall and high humidity prevailing in the Delta region, together w
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