Detailed results on certain farms are recorded, showing that late applica- 

 tions (August and early in September) were very successful. Of other poisons 

 commonly used for various insects, nicotine gave the most promising results, 

 A 2% dust gave as good results as one with higher nicotine content, while no 

 injury was done to the plants. These experiments, however, are not yet com- 

 pleted. 



Suitable machinery for dusting is discussed. Hibernation records showed 

 that about 5% of weevils hibernating in woodlands survived the winter of 1922-23. 



1923 - Coad, B. R., and T. P. Cassidy. Dusting for the cotton boll weevil. U. S. D. A. 

 C. 274, 3 p. May. Wash. 



This circular was prepared to give, in a brief and concise form, the infor- 

 mation needed by cotton growers to help them decide whether it would pay them 

 to poison for Anthonomus grandis and what methods they should follow. 



1923 - McDonald, R. E. Report of the entomologist. Tex. Comn. Agr. Rpt. 16:33-38. 

 Nov. 1. Austin. 



"In view of the large number of machines that have recently been put on the 

 market for catching boll weevils . . . tests were organized for a comparison 

 of their efficiency. In many instances, however, the infestation was so slight that 

 no determination could be made. The results of 20 different methods are briefly 

 summarized. 



Experiments with calcium arsenate dusting, the Florida method, and poi- 

 soned molasses were carried out, but, as the infestation on all plots was always 

 lower than 10%, the results of these tests are not absolutely reliable." 



1923 - McGehee, T. F. Preliminary report on early poisoning on boll weevil control. 

 Miss. State Plant. Bd. Q. B. 3(3): 1- 15, 3 fig. Oct. 



The method of poisoning, as a remedy for the cotton boll weevil, recom- 

 mended in this preliminary report is the application of calcium arsenate, either 

 in dust form or with molasses as a liquid, to the terminal buds of young plants 

 just before any squares form. Another application is made 10 days later, pref- 

 erably of the dust, instead of waiting until 10% to 15% of the squares are punc- 

 tured. This method has been tested for only one year, but is considered very 

 promising. As both liquid and dust gave practically uniform results, where labor 

 is cheap and the acreage small, the liquid may be preferred, but in most cases 

 the dust will be cheaper. When this method is used, the fields should be closely 

 watched during July and August in readiness for a dust application of calcium 

 arsenate if 10% of the squares become infested. This is particularly likely to 

 occur if the fields are in the vicinity of untreated cotton, and points to the neces- 

 sity for cooperative action. The advice of the nearest experiment station should 

 be followed in regard to crop rotation, soil preparation, fertilization, varieties, 

 planting, spacing, and cultivation. 



1923 - O'Kelly, F., and R. Cowart. Cotton experiments, 1923, varieties, fertilizers, and 



weevil control. Miss. Agr. Expt. Sta. B. 219, 11 p. Dec. 



The results of poisoning the boll weevil by the Coad Method are described, 

 the cost of the poison and its application are worked out. The average gain of 

 cotton per acre is shown to be 635 lbs. The outstanding drawback to this method 

 is the lack of satisfactory machinery for applying the poison. 



1924 - Ames, C. T. Boll weevil poisoning work. Miss. Agr. Expt. Sta. C. 54, 12 p. Dec. 



Presents rather detailed results of experiments with sweetened calcium 

 arsenate poisons. 



1924 - Hinds, W. E., and W. G. Bradley. La. Agr. Expt. Sta. Ann. Rpt. Dept. Ent., p. 

 18-30. Baton Rouge. 



The cotton boll weevil was largely controlled bynatural factors. In compara- 

 tive tests with calcium arsenate and lead arsenate, the former, on the whole, gave 

 the better results. In all tests there was an average of 4% greater mortality when 

 the dusts were applied to plants moist with dew. 



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