Q. Can you apply Wood Worm and Dry Rot Killer to Masonary to kill the insects? And can you spray it directly onto the bugs to kill them? A Q. Can you apply Wood Worm and Dry Rot Killer to Masonary to kill the insects? And can you spray it directly onto the bugs to kill them? A. Yes it kills the insects on direct contact. Cromar2020-03-18T15:43:56+00:00 Share This Product. FacebookXWhatsAppEmail