Insect Pests 

 of Interest to Arizona Cotton Growers 



B\ A. IV. Morrill 



Cotton growers in Arizona should know something about the 

 general appearance and methods of attack of the more important 

 insect enemies of cotton, inchiding those which already occur in 

 the State as well as those which the State Commission of Agricul- 

 ture and Horticulture and its agents are trying to keep out. This 

 bulletin has been prepared to give in concise form general informa- 

 tion concerning the principal cotton pests which are of interest to 

 Arizona cotton growers. For those who need or desire more 

 detailed information references are given at the end to a few reports 

 of the Arizona Commission of Agriculture and Horticulture and to 

 bulletins of the U. S. Department of Agriculture. 



THE MEXICAN COTTON BOLL WEEVIL 



Every cotton grower has heard of the Mexican cotton boll weevil 

 (Anthonomiis grandis Boh,) and many farmers now located in Arizona 

 have had experience with it in Texas, Oklahoma, and other states 

 of the so-called cotton belt. This pest has never as yet been found 

 in the cotton fields in Arizona, altho a variety (Anthonomus grandis 

 thurheriae Pierce,) is known to exist in certain mountain ranges in 

 southern Arizona where it infests a wild cotton plant (Fig. 3) 

 known botanically as Thiirberia thespesiodes. 



There are many different kinds of weevils and several of these 

 are confused by cotton growers with the boll weevil. This is not 

 strange, for in some cases weevils of entirely different habits re- 

 semble one another so closely that only an entomologist can dis- 

 tinguish the difference between them. While it is important for 

 cotton growers and others to w^atch carefully for the appearance of 

 strange cotton pests, it is desirable that specimens of such pests 

 be submitted to an entomologist for identification. 



Acknowledgments: The illustrations used in this bulletin are from bulletins- 

 of the U. S. Department of Agriculture and annual reports of the Arizona Com- 

 mission of Agriculture and Horticulture, except figures 7 and 8 which are used 

 through the courtesy of Florida Plant Commissioner Wilmon Newell, figures 1& 

 and 16 which are reproduced from Bulletin 346 of Cornell Agricultural Experiment 

 Station, and the frontispiece cuts which are from original photographs by Mr. J. Li. 

 E. Lauderdale. 



