02-09-2013 11:42 PM
Hi, My business is "Micrometeorology Research and Educational Services" focussing on pesticide application meterorology.
I wonder if you could send me the hi resolution images of the spraying in fog and resultant damage. They can be sent by using a free application called DROPBOX.
Spaying when an inversion exists is not acceptable. Spraying when an inversion exists and humidity is very high as it appears in your case is entirely unacceptable.
Inversions lead to airborne pesticides being trapped near the surface at high concentrations before being transported long istances to destinations difficult to predict.
There is evidence that spraying in foggy conditions can lead to significant drift issues not yet completely understood. Incidence of major drift incidences have been reported in Australia after application in foggy conditions. Scientific studies raise concerns that:
Small droplets not immediately falling to the surface tend not to evaporate and may act as nuclei for fog droplets;
Chemical reactions in fog can result in compounds sometimes more toxic than the original pesticide.
Glotfelty et al, 2000, found that “a variety of pesticides and their toxic alteration products are present in fog, and that they occasionally reach high concentrations relative to reported rainwater concentrations”; and n Settling of contaminated-fog droplets bound with pesticides may fall out over wide areas. According to Seiber (2002): “The scavenging of particle bound pesticides and pesticide vapours into atmospheric moisture (cloud and fogwater, rain and snow), is a potentially major sink for airborne pesticides.
Concentrations of some pesticides in fogwater can significantly exceed those expected based upon vapourwater distribution coefficients. Fogwater deposition has been implicated as a source of inadvertent residues to non-target foliage, and of high-risk exposures for raptors residing in and around treated areas”.
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