374 



733. ; Maxwell, F. G.; and Jenkins, J. N. 1969. Hampea sp., host of the 

 boJl weevil. II. Laboratory antibiosis studies'. Ann. Entomol. Soc. Am. 

 62: 976-978. 

 Anthononus grandis Boheman developmental studies were conducted on diets of 

 freeze-dried cotton buds, Gossypium hirsutum L., and buds and capsules of 

 Hampea sp., a dioecious host, using the laboratory strain of weevils and a 

 wllJ strain collected from Hampea . A high degree of larval antibiosis was 

 found in Hampea . It was more pronounced in female buds and capsules than in 

 male buds. On diets from male buds and female buds and capsules, smaller 

 adults and a longer developmental time were observed. However, the percent 

 adult emergence of the laboratory, but not the Hampea strain of weevils, from 

 male bud diets was about equal to cotton diets. In the female buds and cap- 

 sules the antibiosis was also expressed as high larval mortality. The 2 

 strains of weevils were physiologically different in their growth and develop- 

 ment on all diets. Quantitative chemical analysis of gossypol, ascorbic acid, 

 total sugars, and reducing sugars in the male and female buds and capsules 

 failed to show that any of these materials except possibly gossypol was 

 related to the expressed resistance. Thus, some unknown toxic factor rather 

 than nutrition is suspected as the cause of antibiosis. 



734. ; Maxwell, F. G.; Jenkins, J. N.; and Hardee, D. D. 1969. Preference 

 studies with hosts and nonhosts of the boll weevil, Anthonomus grandis . 

 Ann. Entomol. Soc. Am. 62: 261-264. 

 Tests were made to determine the presence of feeding stimulants and attractants 

 for Anthonomus grandis Boheman in aqueous extracts of host and nonhost species 

 of the family Malvaceae including cotton, Gossypium hirsutum L. The host plants 

 found infested most frequently in nature generally contained the highest con- 

 centrations of feeding stimulant and attractant. Also, all known plants except 

 Hibiscus syrlacus L. attacked in nature by the boll weevil contained gossypol. 



