Had my first run in with these nasty things last year. Chemically I found
out Sevin worked, but as they struck when my Heritage raspberries and grapes
were ripening that was not a real option.
I found one organic method controlled them fairly well....my shop vac.
Partially filled with soapy water. Basically every few hours I was able to
suck up a bunch, and then I found by spraying the leaves they fed on with
soapy water you were able to mask the scent trail a bit, or so it seemed.
Not practical for commercial growers but not too bad for home growers.
Works great for wasps too!
tfb
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[NAFEX] Japanese Beetles,
fuwa fuwa usagi, 02/17/2009