If you have any webs on your plants you have a heavy infestation. The problem with all of these neem and all natural products is that they do not kill the eggs. You can spray as much neem as you want but those eggs will still hatch every 6 or 7 days. Thats why I use the Floramite, Avid, and Forbid. Forbid kills the eggs and if you spray every square inch of your op then the chances of them coming back is slim. If the mites and eggs are dead the I dont see how they would become immune to anything. I will never allow another foreign cutting or clone near my garden again without treating it first. I dip the hole clone into the solution. Subcool does this with gifted clones as well. except he just uses Avid. Just my 2 cents. That will be all from me.