\ 



359 



704. . 1974. Pest management: history, current status and future progress. 

 In F. G. Maxwell and F. A. Harris (eds.). Proceedings of the Summer 

 Institute on Biological Control of Plant Insects and Diseases, pp. 

 1-18. University of Mississippi Press, University, Miss. 



Discussions is concentrated on problems restricted for the most part to the 

 southern United States, principally control of cotton Insects and related 

 pests with considerable emphasis on the control of the boll weevil. 



705. . 1976. The elimination concept and its alternatives.' Iii Boll Weevil 

 Suppression, Management, and Elimination Technology. Proceedings of a 

 Conference, February 13-15, 1974, Memphis, Tennessee. U.S. Agric. Res. 

 Serv. [Rep.] ARS-S-71, pp. 149-153. 



The effectiveness of a pest management system based on these components has been 

 proved and demonstrated in large scale experiments. Other components that will 

 improve the system's effectiveness can be added to it as they become available 

 from additional research, e.g., release of sterilized boll weevils and use of 

 resistant varieties. Such a system would have the added advantage of relaxing 

 the selective pressure of insecticides on resistant populations of tobacco bud- 

 worm and the bandedwing whitefly. It should prevent further development of 

 resistance in these pests. Moreover, it is possible that relaxation of in- 

 secticide pressure on these two species would allow reasonably rapid reversion 

 toward susceptibility to occur in resistant populations. The system would have 

 only one element that would be cause for concern, namely, the possibility that 

 enough selective pressure could bv applied in diapause treatments to select 

 populations resistant to the 0-P insecticides. However, it would not be as 

 likely to select for resistance to the 0-P's as the eradication program that 

 calls for the mandatory in-season treatment of all cotton acreage in phase I 

 of the proposed scheme. Also, it is an encouraging fact that no appreciable 

 levels of 0-P resistance in the boll weevil have developed during almost two 



