1936 - Ting, P, C. The mouth parts of the Coleopterous group Rhynchophora. 

 Microentomology v. 1(3):93-114. Aug. 13. 



Includes a description of the mouth parts of Anthonomus grandis. 



1938 - Sevingle, H„ S. Relative toxicities to insects of acid lead arsenate, calcium 

 arsenate and magnesium arsenate. J. Econ. Ent. 31(3):482. 



pH of the mid-gut of the boll weevil reported as being 6.5. 



1951 - Peterson, A. Larvae of insects. Part II. p. 98, 120, 122. Edwards Brothers, 

 Inc., Ann Arbor, Mich. 



Contains descriptions and drawings of Anthonomus grandis larvae. 



1959 - Burke, Horace R. Morphology of the reproductive systems of the cotton boll 



weevil (Coleoptera Curculionidae). Ent. Soc. of Amer. Ann. Rpt. 52(3):287-294. 

 The genitalia and reproductive organs of the reproducing male and female 

 cotton boll weevil are described and illustrated. Descriptions are given of the 

 musculature associated with the reproductive systems of both sexes. 



1960 - Thomas, John G., and J. R. Brazzel. An abnormal antennal condition in a 



resistant strain of the boll weevil. J. Econ. Ent. 53(4):688-689. 



A male boll weevil, with an abnormal antennal condition, was mated with 

 females to determine whether the abnormality could be used as a genetic marker. 

 Results indicated that the character was a somatic mutation, was not genetically 

 determined, or was the result of an extremely complex genetic mechanism. 



I960 - Werner, F. G. A new character for the identification of the boll weevil and the 

 Thurberia weevil (Coleoptera: Curculionidae). Ent. Soc. Amer. Ann. Rpt. 

 53(4):548-549. July. 



The spermatheca of the female shows promise of providing a useful basis 

 for identification. 



RESISTANCE TO INSECTICIDES 



1953 - Reiser, Raymond, D. S„ Chadbourne, K. A. Kuiken, C. F. Rainwater, and E. E. 



Ivy. Variations in lipid content of the boll weevil and seasonal variation in its 

 resistance to insecticides. J. Econ. Ent. 46(2):337-340. 



1. The total lipid content of the boll weevil increases during the season from 

 a low of about 7% in overwintered to a high of about 22% in October insects. 



2. The fat content of the boll weevil is not directly related to its resistance 

 to chlorinated hydrocarbon insecticides as indicated by 



(a) increasing resistance to calcium arsenate during the season, and 



(b) the higher fat content of insects resistant to any insecticide tested, or of 

 surviving controls. 



3. The relation of high lipid content to high resistance to toxaphene is not a 

 universal quality in other insects. 



4. It is suggested that the higher fat content, larger size, and increasing 

 resistance of late season weevils may be due to the nutritional advantage of boll- 

 reared over square-reared insects. 



1954 - Ivy, E. E., and A. L. Scales. Are cotton insects becoming resistant to insecti- 



cides? J. Econ. Ent. 47(6):981-984. 



No resistance was encountered in either bollworms or boll weevils. In the 

 field cage tests approximately the same amount of DDT was required to kill 

 bollworms as in the initial work 10 years ago. Approximately the same kill was 

 obtained with 2, 1, or 0.5 pound of toxaphene as with the first sample tested in 

 1946. 



With the boll weevil, the picture is slightly more complicated, because of its 

 seasonal variation in susceptibility. In 1953, when tested against weevils reared 

 in squares in June, both BHC and toxaphene showed about the same toxicity as 

 when the initial work was done with these insecticides in 1945 and 1946. Late 

 season tests conducted during 1953 also compare very closely with late season 

 tests conducted in other years. 



150 



