' 



The data used in this bulletin includes examinations in 29 localities in 

 several fields in each locality, and in 1 7 places examinations upon from 2 to 9 

 times between June 15 and October 15, 1906. More than 86,000 forms were ex- 

 amined, and 39,000 weevil stages were found. 



Nearly all of the 11 localities having an average total mortality above the 

 average of the 28 localities examined are south of the center of cotton production 

 in Texas. Ants are more important in the summer control of the weevil than are 

 heat and parasites combined. The mortality from heat in 2 groups of localities 

 having almost identical mean maximum temperatures varies as widely as be- 

 tween 7% and 27%. 



Nearly 70% of all mortality from heat or drying occurred during the larval 

 stage. The ratio of mortality percentages in each weevil stage from heat is adult, 

 1 ; pupa, 3; larva, 9. 



In examination of about 11,000 fallen forms collected between August 10 and 

 August 31, 1905, 25% were squares, and 75% were small bolls. In examination of 

 62,593 fallen forms collected between June 15 and October 15, 1906, 64% were 

 squares and 36% were bolls. Among 24,363 hanging forms examined in 1906, 

 28.6% were squares and 71.4% were bolls. 



Of 11,000 forms from Louisiana in 1906, only 44% contained a weevil stage. 

 The balance of 56% contained many which had been injured by the feeding of the 

 weevils. Among the bolls, 30%, and among squares, 60% contained some stage of 

 the weevil. 



In examinations of forms from Texas in 1906, among more than 14,000 dried, 

 hanging bolls, hardly 25% showed any stage of the weevil; among over 20,000 

 fallen bolls, only 18% had any stage; among 5,600 hanging dried squares, nearly 

 60%, and among more than 36,000 fallen squares, slightly over 60% contained a 

 weevil stage. 



1907 - Howell, A. H. The relation of birds to the cotton boll weevil. U. S. D. A. Bur. 

 Biol. Survey B. 29, 30 p., 1 pi., 6 fig. 



Birds cannot be depended upon to control the boll weevil, but they assist in 

 keeping it in check. As a result of 5 years' work, 43 species of birds have been 

 found to feed on the boll weevil, 23 principally in summer. Suggestions are made 

 regarding State legislation needed to protect certain of these birds. 



The most important birds in the control of the boll weevil are swallows, 

 orioles, blackbirds, and meadow larks. Detailed statements are given regarding 

 the extent to which different species of birds feed upon the boll weevil. 



1907 - Hunter, W. D., W. Newell, and W. D. Pierce. The insect enemies of the cotton 

 boll weevil. La. State Crop Pest Comn. C. 20, 7 p. Dec. 



Brief general account of the parasitic and predaceous insect enemies of the 

 boll weevil, with suggestions for increasing their usefulness. 



1907 - Morgan, A. C. A predatory bug reported as an enemy of the cotton-boll weevil. 

 U. S. D. A. Bur. Ent. B. 63(4):49-54, 2 fig. 



A report was received that Apiomerus spissipes Say, was attacking the cotton 

 boll weevil. A study was made of this insect, giving attention to its life history, 

 food habits, distribution, and natural enemies. 



The results were unfavorable to the supposition that the insect is of value in 

 controlling the cotton boll weevil. It is comparatively rare in cotton fields, espe- 

 cially during the time when the weevils are most numerous and the young insects 

 show a high rate of mortality. 



1907 - Pierce, W. D. On the biologies of the Rhynchophora of North America. Nebr. 

 State Bd. Agr. Ann. Rpt., p. 269, 295-307. 



Brief history of the species and a list of its parasitic enemies. Pages 295 to 

 307 contain a description and comparison of the pupae of Anthonomus grandis 

 with other species of Anthonomus and a bibliography of Rhynchophora. 



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