Pesticide resistance is a fact of life (it's also called "evolution"). No one can afford to be oblivious to the tenets of modern Integrated Pest Management. You have to continually modify methods, formulations, approaches, etc. 

> A resistance monitoring program for the neonicotinoids in southern Florida has demonstrated that tolerance in biotype B has increased 8 fold on the average from 2000 to 2006 for imidacloprid and about 15 fold from 2003 to 2006 for Platinum (Schuster et al. 2006). 

> A Resistance Management Working Group was formed in 2003 to promote resistance management on a regional basis. The group modified previous resistance management recommendations (Schuster and Thompson 2001, 2004; Schuster et al. 2002, 2003) and met with growers to encourage their adoption.

> The recommendations include field hygiene and cultural practices which should be considered a high priority and should be included as an integral part of the overall strategy for managing whitefly populations, TYLCV incidence, and insecticide resistance. 

> These practices will help reduce the onset of the initial infestation of whitefly and lower the initial infestation level during the cropping period, thus reducing insecticide use and selection pressure for insecticide resistance development. Also included are insecticide use recommendations which help to improve whitefly and resistance management. 

> It is recognized that the insecticide use recommendations will not be successful in delaying or reducing insecticide resistance without strict adherence to recommended cultural practices.

Management of Whiteflies, Whitefly-Vectored Plant Virus, and Insecticide Resistance for Vegetable Production in Southern Florida
https://edis.ifas.ufl.edu/in695

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