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Old 29-05-2003, 08:08 PM
Shiva
 
Posts: n/a
Default Fogging for insects with my Burgess Fogger? On ROSES?

Henry wrote:


The drifting of chemicals becomes more significant as the size of the
particle decreases. A paper by Reeves Petroff, Pesticide Education
Specialist at the Montana State University Extension Service [1] reports
the distances covered by droplets of different sizes falling 10 feet in
a 3 mph wind as follows (convert to fixed width font for easiest

reading):

Droplet Type Time Distance Covered by
Diameter of Required to droplets falling 10
(Microns) Droplet Fall 10 Feet feet in a 3 mph wind
--------- --------------- ------------ --------------------
5 Fog 66 minutes 3 miles
20 Very Fine Spray 4.2 minutes 1,100 feet
100 Fine Spray 10 seconds 44 feet
240 Medium Spray 6 seconds 28 feet
400 Coarse Spray 2 seconds 8.5 feet
1,000 Fine Rain 1 second 4.7 feet

Off the top of my head, I'd say my sprayer produces a mist that
falls 10 feet in 5 to 10 seconds. So, in a 3 mph wind (which is
a very light breeze) anything up to 44 feet away is likely to be
reached. That's farther than I would have guessed but not by a
lot. On the other hand, I would never have expected fog to
travel up to three miles. That's certainly something to
consider when applying something poisonous.[...]


This is one time when my intuition corresponds with science.

The tent idea is a good one, for anyone chancing it with a fogger.