Skip to content

Follow the leader

April 9, 2021

Processionary caterpillars (Ochrogaster lunifer) are the larvae of Bag-shelter Moths. At this time of the year they can be found feeding mainly on acacias and grevilleas. As the name suggests the caterpillars shelter in a bag made of silk usually situated in or the base of a food tree.

When a given tree has been defoliated the caterpillars move to find another food source. The lead caterpillar leaves a physical trail in the form of a silken thread as well as a pheromone trail which successive caterpillars will follow head to tail in lines up to several hundred individuals. The picture below shows a procession of only a handful of individuals – I guess trying to walk up the bike path is asking for the silken thread to be periodically wiped out by passing cyclists. A processionary line is also formed when the caterpillars look for a suitable location to pupate (underground).

Both the caterpillars and the adults are covered in fine hairs. These are quite poisonous as they contain an anti-coagulant that can cause hives if touched. The fine hairs from the caterpillars are also suspected to cause premature abortion of the foals in horses.

Not everything fluffy is cute and cuddly!

One Comment leave one →
  1. Susan permalink
    April 24, 2021 10:58 am

    I goggled Bag-shelter moth to see what they looked like. Seeing the silken bag the larvae shelter in, I remembered as a child picking these up and being left with lots of prickles in my hand… painful!

Leave a Reply to Susan Cancel reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: