202 



and alkyl alcohols of high molecular weight. This investigation was part 

 of a study made to identify possible additional 'iomponents of the phero- 

 mone produced by the boll weevil. 



392. ; Thompson, A. C; and Minyard, J. P. 1966. Constituents of the 

 cotton bud. III. Factors that stimulate feeding by the boll weevil. 

 J. Econ. Entomol. 59: 181-185. 



Components of the cotton bud that stimulate feeding by the boll weevil, 

 Anthonomus grand is Boheman, were fractionated. Studies with different 

 solvents and column chromatography provided evidence that 3 cotton-bud 

 components having diverse chemical characteristics were present and elicited 

 response from the weevil. Response of the insect was modified by factors 

 such as pH, light, the diet fed, both in pre-emergence and adult stages, 

 along with age and sex of insect. Secondary responses to a gossypol- 

 flucose Incubate in the presence of emulsin, pH 8.0 phosphate buffer, or 

 ATP, as well as sugars, salts, and ascorbic acid, were demonstrated. Tlie 

 insect-feeding threshold, determined from the straight-line plot of 

 feeding activity vs. '.:he log of extract concentration, was 0.015 ng. 



14 



393. ; Wiygul, G.; and Mltlin, K. 1967. Absorption and metabolism of C - 



labeled tepa by the boll weevil. J. Econ. Entomol. 60: 215-225. 

 Some aspects of the absorption and metabolism of C -labeled tepa by the 

 male boll weevil, Anthonomus grandis Boheman, were studied. Topically 

 applied tepa is absorbed almost immediately into the haemolymph, where it 

 reaches a peak in 1-3 hours and then slowly declines. This trend parallels 

 a decline of tepa on the cuticle to 10% within 6 hours. Values of the 

 differential distribution ratio for body parts and organs were determined 

 for injection and for topical treatment on the abdomen. Selective concen- 

 tration occurred in the foregut, testes, and wings with injection and in the 



.■■.^:^ . .,>.,>;■, I i„ - i S m I - -n il ■ - - -^ ^■■■.■rf.....=>^-t,^VMr>tif»^a.-inin>fi i iiir-a i rl 



