I'm quite sure these are moth eggs because they appeard on my fence the morning after I had a moth light on in that spot. The second photo is a few days later.
Be creative. Maybe scrape some off gently, or if the wood is spare: chisel a thin slice with some eggs on. Keep in a closed container. When they hatch offer a mix of leaves each of gum, wattle, grass, other plants, some old wood with lichen on. See what they seem to nibble.
More info at http://lepidoptera.butterflyhouse.com.au/faqs/care.html
The eggs have hatched. They turned into tiny little loopers. Unfortunately they are not showing any interest in any of the food I have provided. I have tried two kinds of eucalyptus, two kinds of wattle, some grass (native, I think) and now I have emoved the eucalyptus and I gave them some rose petals, a rose leaf and a pansy flower. So far no interest. They are running around looking for something better.
Photos? Oh how frustrating. Keep trying: slice of apple, lichen, leaves of Proteaceae, Euphorbiaceae, Asteraceae, whatever other families you can find. Ian Common once said to me that caterpillars are much better botanists than we are.
I have added photos. They photos not great but the caterpillars are so small that it was almost impossible to take them. The caterpillars are not eating but are still active. I have just changed their food. Thanks for any advice.
Being laid on a fence suggested they were Lichen eaters from Lithosiini, but clearly they are loopers, so probably from Erebidae or Geometridae. Looking at http://lepidoptera.butterflyhouse.com.au/geometridae/geometridae-eggs.html , no species there lays the eggs in a tidy array. However some of the species in http://lepidoptera.butterflyhouse.com.au/erebidae/erebidae-eggs.html , do lay in a tidy array. Many of those species will eat leaves from only one plant family, maybe one of the 158 listed in http://lepidoptera.butterflyhouse.com.au/plants/index.html
. Discovering which one before the tiny caterpillars perish will be hard.
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