Hi all, I assume imidacloprid is the active agent in the Bayer pesticide mentioned. I have found that imidacloprid alone does not do the job against mealy bugs anymore. I suspect that mealy bugs are becoming resistant to this chemical, and probably soon if not already to related chemicals. Imidacloprid is in the neonicotinoid family (not sure of the correct spelling). I have been using a mixture of bifenthrin and imidacloprid sprays in attempting to clean up my larger greenhouse. I'm not sure these are official label uses for these two pesticides, so don't take this as a recommendation! In any case, if mealy bugs are beginning to develop resistance to some pesticides, we need to find new ones (i.e. from new chemical families) to use against these ubiquitous pests, and I think we will need to always use combinations of two different types of pesticides. Just my opinoins..... Jim Shields At 12:08 PM 12/7/2011 -0500, you wrote: >Hi guys, > > Well, it's that time of year where the mealies seem to get a bit out of >control! I can't seem to keep them at bay, does anyone have any advice? >I've been using Bayer 3-1 spray with a systemic but it doesn't seem to be >doing the trick? > >Thanks >Josh, Indiana ************************************************* Jim Shields USDA Zone 5 P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Lat. 40° 02.8' N, Long. 086° 06.6' W