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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.

Sean L.

Reply with quote  #2 
Great questions. This post is two years old and does not have an answer? Too bad Dramm didn't answer these questions. I would love to know what they say about your questions.
Kurt Becker

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Dramm Staff
Posts: 177
Reply with quote  #3 
Sorry for the late reply. For some reason, we have not been receiving all of the notifications when there are new forum posts.

The Coldfogger, unlike the PulsFOG or the Autofog, is not intended to be sprayed above the canopy, but into the canopy, like a regular hydraulic sprayer.

The spray from the Coldfogger is much finer and will diffuse quickly, swirling and coating all plant surfaces. Unlike a hydraulic sprayer, the volume is much lower and you will only see a slight glisten on the plant. We do not want to see solution running-off the plant.

The Coldfogger is excellent at controlling mites as it is very good at penetrating the canopy and coating the undersides of the leaves. The force from the spray also helps to penetrate any webbing that might be present.

With the Coldfogger, it is best to have no air movement. As this is intended to be a directed spray, unlike other low volume applications, air flow might take the spray away from the target and cause more drift. 

If there are additional questions, please let me know.

Kurt Becker
Dramm Corporation
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