"Paul J. Dudley" wrote in message
news
Last month ( mid June ) I had applied Seven dust to my grapevine
due to Japanese Beatle infestation. I applied by hand ( gloved ).
I grabbed a handfull at a time and just tossed it across the whole
of the foliage and grape clusters. Here it is mid July and I still
see some rather rich deposits of the dust sitting on the clusters.
As these grapes ( type unknown ) are reaching ripeness they will
no doubt be harvested within the next 2 weeks to make wine. Will
the residual Seven dust pose any health threats at this point ? I've
tried rinsing with a garden hose but to no avail. It is rather "caked"
in some areas. There might have been some moisture on the grapes
when I slung the seven dust causing it to do so.

Paul, don't waste your time with Sevin dust. I recently learned it's been
used so much and for so long the bugs have immunity to it. I believe it
because it did nothing to help control whitefly and spider mites. Water
spraying just increases your water bill because to knock off insect eggs
etc. the force needed would seriously damage the leaves and the adults are
back on the plants before you can turn the water off. This is the first
year we don't have Japanese Beetles, probably because the whitefly and mites
took over the gardens.