Great short and long answers!
BT is active for 5-7 days, but the unscented Castille soap spray works on contact. So I would use that and then use the BT the following day, then wait 4-5 days and spray the Castille again, followed by the BT.
Take one of those bugs and spray it with the Castille spray and see if it dies first, because I'm not familiar with that bug, but you're on the opposite side of the world!
BT info source:
BT is active for 5-7 days, but the unscented Castille soap spray works on contact. So I would use that and then use the BT the following day, then wait 4-5 days and spray the Castille again, followed by the BT.
Take one of those bugs and spray it with the Castille spray and see if it dies first, because I'm not familiar with that bug, but you're on the opposite side of the world!
BT info source:
EARTH-KIND Gardening | Archives | Aggie Horticulture
aggie-horticulture.tamu.edu