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black slug cup moth

The common name "cup moth" is thought to come from the shape of the pupal cocoons constructed by the caterpillars, which are cup-like in appearance after the moth has emerged. No further sign of juvenile caterpillars was seen inside the aviary service area or bird-room.During autumn however, the White Cedar trees acquired woolly, hairy “trunk-warmers”. These pesky but striking caterpillars usually appear in great numbers and can strip a small eucalypt bare of all it’s leaves. They usually have many short spines, either scattered over the body, or in dense, expandable clusters on tubercles.

As summer progressed the numbers of these hairy brown caterpillars increased dramatically until they were everywhere – up the walls, along the skirting boards, in the door frame and in the curtain folds.

These spines can cause severe local irritation and swelling if touched. While some damage is evident, it does not seem to concern the trees, which are deciduous, and have just about lost all their leaves by June.The mass of caterpillars, armed with spiky and irritating hairs, would pose an unpleasant barrier for anything else small wanting to climb the tree or gnaw on it’s lower bark.

They are the laval form of a fairly unremarkable brown moth. Their egg clusters are intriguing and conveniently some were in plain enough view that we were able to observe and record their progression to hatching.The caterpillars emerged en-mass, hung around for the day, and by the next morning had all disappeared. Presumably under the cover of darkness they venture up the trees to wreck havoc on the leaves. There are usually two generations of cup moths per year with numbers of larvae peaking in autumn (now!)

The caterpillar is legless and moves like a slug.


An adult cup moth, Doratifera stenora. Then they started to pupate, turn into moths … and lay eggs.By this time we had enough information and specimens to identify the invaders and they were positively id as White Cedar Moths, Leptocneria reducta. Slug Caterpillar (Cup Moth, Limacodidae) "Lucifer" Pu'er, Yunnan, China . It has a orange-brown head but cover under its thorax.

We have a number of young White Cedar trees planted to provide summer shade to the aviaries so another piece of the puzzle fell into place.The moths were almost as numerous as the caterpillars, and before long there were clusters of eggs on the service-way walls and dead moths all over the floor and trapped between the polycarbonate and aviary mesh. The caterpillars may be hiding in the dry leaf litter and grass during the day, emerging at night …Which is indeed what they are doing. Their hairs are irritants and will shed easily. Very striking.Thank you for leaving a message on Beyond Our Patch, it is greatly appreciated.

The Black Slug Cup Moth caterpillar is black in colour with white spikes.

They are the laval form of a fairly unremarkable brown moth. The hairs can not only cause skin irritations in humans, they have also been implicated in abortions in horses. More information on the Black Slug Cup Moth can be found at Back in late March we noticed this odd mass on one of the small eucalypt trees. It will be interesting to see if this new growth is as tasty, or whether the trees are able to defend themselves and become less palatable as some other plants can.The absence of caterpillars during the day this year may indicate they prefer dry grass and leaf litter, and disliked the lush grass and damp ground experienced in previous years. The caterpillar is legless and moves like a slug.
It has a orange-brown head. Black slug cup moth caterpillars. This caterpillar feeds on gumtree and wattle leaves. The caterpillars, pupae, and moths are all sources of irritating hairs, which retain their irritant properties long after they have been shed.More information on health implications of White Cedar Moths can be found at the Further reading on White Cedar Moths can be found here: The White Cedars have been seriously defoliated this year, but there is no sign of the catterpillars around the base of the trees. Biography.

These caterpillars, while very pretty, can strip eucalyptus trees until they are almost bare (certainly not a friend to the koala). It is possible some may have survived to reach the White Cedar trees as there were no suitable food plants any closer. If you see a mass like this hanging in a tree, do not try to handle it! The adult moths are small, nondescript, mottled brown moths with wingspans of about 30 mm. The Black Slug Cup Moth caterpillar is black in colour with white spikes. We'll have to keep our eye out for this one.

An evening torchlight visit to the White Cedars revealed them to be literally crawling with big, fat, White Cedar Moth caterpillars.

Each spine is hollow and filled with venom produced by a gland at the base. I haven't seen this caterpillar before and had to take a photo to identify it when I got home. Perhaps this behaviour is their way of protecting their food supply – the trees and their leaves – from other potential competitors or threats.White Cedar Moths belong to the Leptocneria family, and both the moths and caterpillars are yet another in the “handle with care” category.

More information on human reactions to these insects can be found at

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