I just looked up Dipel DF. It is made with Bt v Kurstaki. It is 100 % safe for humans and is OMRI certified. The reason it said to call poison control was because it also contains DE or diatomaceous earth, another organic pesticide made from the fossilized remains of marine phytoplankton. It is an abrasive and irritates some peoples skin. It is food grade and many people add it to their food for digestive purposes. It is also used in cattle feed. I have never used Btk but from my research it seems as if it might be better than regular Bt