\ 



440 



rates of release gave a greater initial uptake than occurred with a formula- 

 tion with a slow rate of release and a more prolonged uptake than occurred 

 with a formulation with a fast rate of release. 



861. Stoner, A. 1968. Sphaeralcea spp. as host of the boll weevil in Arizona. 

 J. Econ. Entomol. 61: 1100-1102. 



All boll weevils that crawled from the tip collections and those removed from 

 cotton bolls fed readily on fruits buds and flowers of S^. emoryi but failed to 

 reproduce. The weevils appeared normal, large and robust. Those found on the 

 tip collections had probably emerged from diapause in ground ttash or other 

 sites and then moved into Sphaeralcea , but probably none were produced on it. 

 Sphaeralcea spp., although not true hosts, are available as food plants and 

 boll weevils will feed on them. Thus, in Arizona the plants can at least pro- 

 vide food in the interval between boll weevil emergence from hibernation and 

 the availability of cotton. 



862. Struck, R. F.; Frye, J.; Shealy, Y. F.; Hedin, P. A.; Thompson, A. C; 

 and Minyard, J. P. 1968. Constituents of the cotton bud. IX. Further 

 studies on a polar boll weevil feeding stimulant complex. J. Econ. 

 Entomol. 61: 270-274. 



Techniques were used to concentrate and fractionate the polar feeding 

 stimulant for the boll weevil, Anthonomus grandis Boheman, that is found 

 in the buds of cotton, Gossypium hirsutum L., Delta Pine Smooth Leaf. An 

 active fraction could be extracted from f reeze-dehydrated bud powder with 

 water after successive extractions with several less polar solvents and, 

 consequently, after removeal of hydrocarbons, carotenoids, terpenoids, 

 and flavonoids. The major active polar principle extractable with water 

 was not absorbed on a weak cation exchange resion and was precipitated 

 with lead ions. Studies by gel permeation suggested a moderate molecular 



