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912. . 197:"). Isolated at last— the boll weevil's grandlure. Agric. Res. 

 18(11):. 3. . •/_ ,;, • 



Scientists stationed at the ARS Boll Keevil Research Laboratory, State College, 

 Miss., have isolated four compounds, two alcohols and two adehydes, from boll 

 weevils, which. when mixed together produce an active synthetic attractant they 

 named grandlure. In laboratory tests, females responded to grandlure in the 

 same way that they reacted to live male boll weevils. 



913. . 1971. Bracts--foil boll weevils. Agric. Res. 20(6): 3-4. 

 Frego bract, an odd cotton mutant, may have one of the keys to biological 

 control of the weevil. Frego has unusually narrow twisted bracts which are 

 not suited to the weevil's egg- laying habits. In normal cotton, the bracts 

 are broad and le. flike, offering the weevil a preferred environment for egg- 

 laying. Bracts are bjx like structures surrounding the buds. In 1970, ARS 

 entomologists grew several 10- to 20-acre fields of Frego bract cotton on four 

 forms in different parts of Mississippi. Their studies showed that frego bract 

 reduced the boll weevil infestation 66 to 94 percent when compared to fields 



of nonfrego cotton. 



914. . 19/1- Found: chemosterilant for boll weevils. Agric. Res. 29(5): 5. 

 Busulfan, one of hundreds of chemical compounds tested, has been found to 

 make male boll weevils sexually sterile with little or no damage to the weevil. 

 One of the major advantages of busulfan is its permanent effect on males; other 

 tested compounds induce only temporary sterility. Busulfan also results in 

 little damage to the digestive system - a cause of premature death in weevils 

 exposed to irradiation. Credit for developing busulfan as a sterilant is 

 shared by a team of ARS chemists and entomologists. 



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