Investigating pesticide failures

When a pesticide that you used to depend upon for reliable activity no longer works, it's time to start the detective work. Finding out the reasons behind pesticide failure will not only help you to prevent another failure in the future, but will also save you time, money and needless pesticide applications. Above all things, though, it's important not to get sloppy and to resort to "rounding up the usual suspects".

Frequently, the first "suspect" that comes to mind when…