Years ago I used Orthene 97WP and the smell was bad enough to almost make me sick. The active ingredient was Acephate 97%. Are the current formulations of generic Acephate 97% less odorous? Currently I alternate between Imidacloprid and Sevin (Carbaryl) but Sevin leaves a white leaf stain that I don't like. Does the Acephate leave a visible residue?