I should really do it too. I keep thinking of doing it every year but then I forget about it. Another reason is I avoid growing brassicas most of the warm season due to white butterfly, so if I actually do it I can get some nice looking brassicas.

[–] 2tapry 2 points 1 year ago (4 children)

Bacillus thuringiensis is the answer, for me anyway, for white butterfly. It's organic approved - from a natural bacteria found in soil.

It's the only spray I use (besides pyrethrum). It disrupts the catapiller and keeps brassicas from being eaten.

You buy it as a powder and mix a tiny amount with water (a drop of detergent helps) and spray about every two weeks. I highly recommend it.

[–] eagleeyedtiger 2 points 1 year ago (3 children)

Where do you get your BT from? I've heard of it before, but I feel for a small area preventing them laying eggs in the first place is easier than having to spray when new caterpillar's emerge. IIRC it doesn't do anything until they are already hatched and eating the plant right?

[–] 2tapry 3 points 1 year ago

Dipel was the product I couldn't remember the name of, but I can't find it for sale in New Zealand.

I found it on an Aussie Bunning's website: Yates 40g Natures Way Caterpillar Killer Dipel Insecticide but that's not helpful :(

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