Oh boy, I dont miss them up here.
When I was a kid in Adelaide we had them on the street tree often.
Disgusting and their hostile.
I burned them, sprayed them petrol and burned them. They were like a king sized football of spitting vile on a branch of the tree, disgusting.
Seriously, they are bad. Make my stomach turns thinking of them disgusting caterpillars.
For those who dont know they are gregarious (hang out in groups like hippies), they huddle up like Kiwi's ready for a Haka and instead of sticking tongues out they spit!
Sawflies, lord help you if you are climbing a tree and cop them buggers, no worries if it's a TD and send them down in a big hurry, chip this guys.
My advice, you have to nail the buggers when daylight and they're in a group. At night they all go their own ways and eat, but during the day when they're a big clump, that's the opportunity to kill them.
Now killing them without chemicals.
Hmmmm, tick tock tick tock.
They're living and breathing things right?
So, wonder what a C02 fire extinguisher would do?
Maybe have a tarp below, cut the group off and drown them.
Freeze them with a blast of liquid nitrogen.
Just think outside the box like that, but frankly between you and I .... I'd find the best hard hitting knock down chemical and spray the bastids. Kill em all.