297 



components in the pheromone of these weevils differed from that in the stan- 

 dard formulation of grandlure and was less attractive. Consequently, even 

 sterilized laboratory weevils should be more attractive than overwintered 

 males. 



573. ; Mitchell, E. B.; and Cross, W. H. 1978. Improved technique for 



12 

 tagging boll weevils with P. J. Ga. Entomol. Soc. 13: 24-28. 



Weevils can now be easily and safely radioactively tagged by placing them 

 behind a piece of clear lead glass and using an electrically driven micro- 

 applicator controlled by a foot switch and a shielded syringe to dispense 

 the material. The weevils are first anesthetized with CO2 and then picked 

 up with a vacuum controlled pipette by using a foot operated solenoid switch. 

 Tagged weevils were detectable at 35 to 86 cm where weevils are tagged with 

 0.84 - 3.33 MCi/weevil. 



574. MacGown, M. W., and Sikorowski, P. P. 1980. Histopathology of midgut of 

 mass reared, irradiated boll weevils contaminated with Staphylococcus 

 aureus and Streptococcus sp. J. Econ. Entomol. 73: 81-87. 



Bacterial contamination and irradiation cause rapid deterioration of midgut 

 epithelium of Anthonomus grandis grandis Boheman. Staphylococcus aureus Rosen- 

 back and Streptococcus sp. greatly accelerate the effects of irradiation, re- 

 sultirig in destruction of the tissues within a few days. The bacterial damage 

 to the midgut causes premature mortality of the boll weevils. 



575. McHaffey, D. G., and Borkovec, A. B. 1976. Vacuum dipping: a new method 

 of administering chemosterilants to the boll weevil. J. Econ. Entomol. 

 69: 139-143. 



Sterility in both sexes of Anthonomus grandis Boheman resulted when adults 

 were dipped for 5 sec in certain chemosterilant solutions of pressures of 

 175 mmHg or less. Effective compounds were tris (1-aziridinyl) phosphine 



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