I have had remarkable success with Enstar II. Theoretically insects can become resistant to it, however. Consider a population of an insect species. Perhaps there are a few that are more resistant (less affected) than others, and that in the course of events they get a lower exposure to the IGR and mature. There may only be a few, and for this reason they may have trouble finding mates, but if they do their progeny will probably have increased resistance.
Consequently I, too, would not bet the farm (and certainly not my orchids!) on the postulate that Enstar resistant strains are impossible. Martin _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com

