I always use BT every other week along with Potassium Bicarbonate spray bi weekly , My Catties are almost nil. I found one tiny one weeks ago and none since.we are really happy about the lack of worms and caterpillars this season , thanks to the Bt and Bt with Spinosad
once a week or about every 10 days right up to the beginning of flower
Bt also knocked back the aphids this season
looks like we might start harvesting this week
or , we may wait two more weeks.
The Catties will decimate your plants near end of grow unless controlled,
I am at the point I have to watch for WPM (white Mold) and Rot caused by moisture inside the bud and not Catties boring inside them, Both have cause rot in the past for me.
\
The worst kind