We are a small team of technicians servicing several acres of university research greenhouses. In the year 2000 this department purchased a Dramm 600M Mini Coldfogger but never actually used it. We are now attempting to introduce it into our spray program to complement our conventional hydraulic sprayers. I have been tasked with testing the unit and researching how it can best suit our needs. Using clean water I have verified that the 600M Mini Coldfogger is in good working condition.
My question to the Dramm staff or any greenhouse technicians on this forum is: what pests/diseases are best controlled using the coldfogger? My understanding is that the coldfogger is intended to be sprayed above plant material, and that runoff or visible spray residue on the plant is undesirable as the higher pesticide concentrations in the low-volume coldfogger carry a higher potential for phytotoxicity.
Our most persistent and difficult to control pest in our greenhouses is the two spotted spider mite. My concern is that by spraying overhead of foliage, the coldfogger will not thoroughly contact the underside of foliage where the mites are most concentrated.
As a followup question, when using the coldfogger should we be turning off our HAF fans, vents, and pad & fan systems? Does high airflow help the fog permeate plant canopies or do we want still air so the fog can effectively “settle” down into the foliage?
I welcome any input or observations.