31 



The esterases of the cotton boll weevil were separated by polyacrylamlde gel 

 electrophoresis into four major regions. These were named Est I-IV in order 

 of migration from anode to origin. Polymorphism was observed in all regions. 

 The Est II region was shown to consist of no more than two bands (fast and 

 slow) . The inheritance of the fast and slow bands of Est II was demonstrated to 

 be controlled by codominant autosomal alleles. Analysis of the gene frequency of 

 the Est II region showed that one field population was consistent with the Hardy- 

 Weinberg law (P=0.995), while a second field population was not at equilibrium 

 (P < 0.001). 



56. Birch, M. ; Trammel, K. ; Shorey, H. H.; Gaston, L. K.; Hardee, D. D. ; 



Cameron, E. A.; Sanders, C. J.; Bedard, W. D.; Wood, D. L. ; Burkholder, 

 W. E.; arid Muller-Schwarze, D. 1975. Programs utilizing pheromones in 

 survey or control. Frontiers of Biol., Pheromones 32: 411-461. North 

 Holland Pub. Co., Amsterdam, Netherlands. 

 Clearly pheromones are no panacea for pesticide plagued agriculture. They are 

 still not available for regular use, but their promise for practical use in the 

 near future has not diminished. Whether pheromones prove to be of agricultural 

 value as a control technique, or not, their study should produce a lot of valuable 

 biological information about pest species and their use as a survey tool is al- 

 ready of great value. Pheromones will probably take their place, along with 

 other new techniques, as part of a broad spectrum of control strategies to pro- 

 vide additional and optional inputs into the pest control decision making appa- 

 ratus. The future emphasis will be on a multi-faceted approach with flexibility 

 as the key note. Research with pheromones is reviewed for the redbanded leaf- 

 roller, cabbage looper, pink bollworm, boll weevil, gypsy moth, and spruce 

 bud worm. 



