. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. ? Ma; 12,1923 BOLL-WEEVIL COTTON IN TEXAS. By O. F. Cook, Bionomist in Charge, Office of Crop Acclimatisation and Adapta- tion Investigations, Bureau of Plant Industry. Page. Nature of boll-weevil cotton 1 Distinctive characters of boll-weevil cotton 2 Sterile involucres of boll-weevil cot- ton 3 Weevils sheltered by large plants 4 Weevil damage on exposed plants 5 Open lanes between cotton rows 6 Wider lanes and closer spacing in the rows 7 CONTENTS. Page. Feasibility of wider lanes 9 Factors of the
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. ? Ma; 12,1923 BOLL-WEEVIL COTTON IN TEXAS. By O. F. Cook, Bionomist in Charge, Office of Crop Acclimatisation and Adapta- tion Investigations, Bureau of Plant Industry. Page. Nature of boll-weevil cotton 1 Distinctive characters of boll-weevil cotton 2 Sterile involucres of boll-weevil cot- ton 3 Weevils sheltered by large plants 4 Weevil damage on exposed plants 5 Open lanes between cotton rows 6 Wider lanes and closer spacing in the rows 7 CONTENTS. Page. Feasibility of wider lanes 9 Factors of the spacing problem 9 Early crops from small plants 11 Late thinning to suppress vegetative branches 14 Close spacing necessary with late thinning 15 Conclusions 16 List of publications on weevil resist- ance and close spacing of cotton 19 NATURE OF BOLL-WEEVIL COTTON. The expression " boll-weevil cotton " is used by farmers in Texas, who. recognize the effects of weevil injury in altering the behavior of the plants by forcing them into rank growth, so that the damaged fields are different from normally productive cotton. In addition to the direct injuries inflicted by destroying flower^buds and bolls, the insects are responsible indirectly for an abnormal luxuriance that changes the form and appearance of the plants. Texas has had more experience with weevil injury than other States, with varied con- ditions and seasons that bring out the contrasts between the normal behavior of the cotton crop and the abnormal behavior of " bad weevil ; The weevils entered southern Texas from Mexico in 1802, but did not reach Louisiana till 1903. Arkansas and Oklahoma were invaded in 1905, Alabama in 1909, Georgia in 1914, and North Carolina in 1919. Cotton tends, of course, to grow rank in the rich Texas soils if moisture is abundant and the spring weather is warm, but such natural tendencies to luxuriance are greatly increased when the weevils are abundant and the flor
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