Originally Posted by The End Is Near
I think this is just fearmongering due to the fact that dichlorvous gas is chemical based.
I've said it before, NPS should always be the first step in killing mites and other pests, for they are unmatched in price, effectiveness, availability(walmart), and ease of use. The one and only thing I've heard negative is that some places like CA have NPS resistant mites.
I dont think it's "fearmongering" at all... Just facts... There have been plenty of studies... Which is why they are no longer used in public offices, schools, etc. I dont wear foil on my head.
Yes, They're are a very good way of removing pests, This is not what I am trying to get at. This is already known. And no where in this thread have I said they were harmful to plants. I say that they should NOT be used on flowering plants for a simple reason, You are putting trace amounts of carcinogenic chemical residue on your harvest. You probably dont notice, but it can't be very healthy.
I am simply trying to set a warning that can be viewed by all so that they know what they are dealing with.
And fyi, "NPS resistant mites" are not found just in CA. Spidermites can adapt and become immune to the chemical anywhere if used incorrectly to dispose of them. I believe this happens when the NPS are left in the rooms for long periods of time with regular ventilation as preventative measures which causes a low enough concentration over a period of time for the mites to simply get used to them. Its no different from how they grow resistant to other insecticides.
Like I said, the correct and safer way to use NPS to get rid of mites is to use them in a room with no ventilation for 5-7 days or until there are no signs of pests... Then you simply remove the NPS and rinse your plants thouroughly after.