06 Dec 20 Glenn (Australia - sub-tropical climate)
Nothing - simply place a small piece of mosquito netting over the cabbage with a couple of sticks to keep it off the cabbage to stop the white cabbage moths landing to lay eggs. Bingo: another step to organic cabbages.
You can make organic spray from garlic or mix olive oil with water and add a squirt of liquid soap. Lots of ways to do it , just search online for some others using chilli or neem oil. Goodluck!
Look on the internet for 1. chemical sprays at Bunnings or nurseries or 2. if you want organic, look for one of them. You can buy some organic ones or make then up yourself.
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