Synergistic.... they are not required to test that... Unfortunately.. The last time I read about a test of a certain pesticide.. the company (bayer) put a couple hives on a plot of treated canola that measured 100 by 300 feet... Did the bees even USE a plot that small? I was astounded that the EPA could be such idiots as to accept a test like that, but accept it they did..
For a company that has often announced that they are concerned about the welfare of the bees to do a test like that, is proof enough to me that they are only concerned about the money. If they wanted to do a real test, JUST about ANY beekeeper alive could have designed something that might have shown real results.