

319 



at S'C these extracts became as attractive as extracts of the male plant and 

 of cotton freshly prepared from buds stored at -SCC. Also, female buds con- 

 tained significantly less feeding stimulant than male buds and cotton buds. 

 This lesser concentration plus the volatile repellent produced a high degree 

 of resistance to the boll weevil (nonpreference) to female buds and capsules. 



619. ; Jenkins, J. N.; and Parrott, W. L. 1967. Influence of constituents 

 of the cotton plant on feeding, oviposition, and development of the boll 

 weevil. J. Econ. Entomol. 60: 1294-1297. 

 When quercetin, rutin, tannin, and gossypol were mixed in artificial adult and 

 larval diets and fed to boll weevils, Anthonomus grandis Boheman, gossypol at 

 1.65 and 2.65% dry weight in the adult diet, plugs caused a statistically 

 significant increase in feeding, and levels of 1.15-2.15% significantly in- 

 creased oviposition. Feeding was also increased at all other levels though 

 not significantly beyond the base level of 0.15%. Gossypol, incorporated 

 into larval diets in concentrations of 2.0-3.5%, significantly reduced the 

 weight of emerging weevils, but 3.5% was required before the production of 

 adults was significantly reduced. Quercetin did not significantly reduce 

 feeding or oviposition. At levels of 0.1-0.6%, it increased the weight of 

 emerging weevils, but at all other levels weight was not significantly 

 affected. Tannin and rutin at levels of 0-0.1% did not significantly in- 

 crease or decrease feeding. Tannin reduced weevil weight significantly at 0.2, 

 0.6, 0.8, and 1.0% levels; rutin at levels of 0.1-1.0% did not influence the 

 weights of adult weevils at eclosion. 



/ 



