/ 



356 



adults, sucrose protected against arabionse poisoning. Increasing the sucrose 

 content of the larval diet also decreased the toxicity of arabinose fed to 

 newly emerged adults. Arabionse was less toxic to adults previously fed either 

 cotton bolls, flower buds, or artificial diet pellets for 10 days than it was 

 to unfed newly emerged adults. In boll-, bud-, and pellet-fed adults subse- 

 quently fed sugars, arabionose was about twice as toxic as L-rhamnose. Al- 

 though there was no difference in mortality between sexes when newly emerged 

 adults were fed arabinose and mixtures of arabinose and sucrose, among adult 

 weevils previously fed either bolls, buds, or pellets the females were more 

 susceptible than males to arabinose and rhamnose. 



698. , and Betz, N. L. 1966. Surface sterilization of eggs of the boll 

 weevil with cupric sulfate. J. Econ. Entomol. 59: 239. 



We recommend the following procedure for surface sterilization of boll weevil 

 eggs and have used it for more than 2 years with excellent results: place the 

 eggs in 18% cupric sulfate for 3-5 min and then wash with sterile water. Allow 

 the eggs to stand in a solution of 0.04% mercuric chloride in 25% ethanol for 

 2-3 min, wash the eggs with sterile water, and place them on the artificial 

 larval medium. If the egg surface is thought to be contaminated with an un- 

 usually large number of microorganisms, better results are obtained when the 

 eggs are held in 18% CuSO, longer than 3-5 min. 



699. , and Betz, N. L. 1975. Lack of synergism when Strobane-DDT mixtures 

 are injected into the boll weevil. J. Econ. Entomol. 68: 438-4A0. 



Strong synergistic action was obtained following topical application of 

 Strobane® (terpene polychlorinates [65% chlorine] )-DDT (2:1) to 3 rcsis- 

 tanL strains of Anthonoi-us grandis Boheman. However, when mixtures of 

 Strobane-DDT were injected, very little or no synergism was observed. 

 Injfected DDT was more toxic than injected Strobane. 



