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Earwi'GO!

This project is OPEN for 2021

 

The latest project from the Buzz Club, Earwi'GO focuses on a beneficial but often maligned insect group: earwigs.  As part of both the pest control and pollinator communities, earwigs are very valuable in garden ecosystems, but have tended to suffer from bad press due to their omnivory.  They can nibble on soft plant parts like petals and young leaves, but the damage they do is minor, and the biological control they provide by munching through aphids is much greater.

 

So why are we focusing on earwigs?  Well, one of the Buzz Club's main project themes is making homes for overlooked types of garden insects. As Hoverfly Lagoons has shown, making new spaces can really boost the numbers of insects in green spaces - and help us all get more familiar with our tiny neighbours.

Earwigs would certainly benefit from a little help. They are 'univoltine', which means they only produce one generation per year, so are hit particularly hard by harsh conditions or damaging events, as they struggle to replace lost egg clutches and young.  They also do not travel very far (a Belgian study showed disperal distances of ~30m!), and tend to aggregate together where they are present.

Due to their historical reputation as pests, a lot of information about 'managing' garden earwigs is about their control, with earwig 'traps' taking advantage of their tendency to seek out tight spaces to rest in during the day. A similar method is used for catching earwigs for ecological sampling, using rolled up cardboard placed on trees.

Earwi'GO! is taking these techniques, and using them to create earwig housing. We will have both Hoverfly Lagoons, and Earwig Hotels!

The first stage of this project is to find out what kind of hotels our garden earwigs like best. The second step - when we have found the best design - is to look into the pest control service that those earwigs provide. But we need to best hotels first - and this is where you come in.

Name:            Earwi'GO!

Year(s):           2021 -

Focus?           Earwig habitat

Status?          In development /
                       Open

Project lead contact:

Linda Birkin

Project summary

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European earwig. Photo by 'Hedera.balitica', 2019, Flickr. CC BY-SA 2.0

Earwig hotels on a garden apple tree.

Taking part in Earwi'GO!

This project will run from June to October.

 

Earwigs start to emerge from their overwintering nests in summer, and will start to move up trees as they get older.  Ideally we would like participants to have access to a tree that they can attach some earwig hotels to; but since earwigs are not exclusively found on trees, you can still take part in a garden without a tree!

We want to test out three types of earwig hotel.  The basis for all of them will be a plant pot (recycle a plastic one, or use teracotta if it is not too heavy for your tree / stick), but the fillings will be different.  You will need to make the following hotels:

Cardboard hotel

Using folded toilet rolls to make cardboard tubes for the earwigs to cosy down in.

Paper hotel

Using tightly folded paper (in toilet roll tubes) to make paper tubes.

Location, location, location - for the hotels

You only need to do one  of these locations for the project.  E.g. all three hotels on one tree, or above the same patch of ground cover.

Hotels should be somewhere shady, so they do not heat up in the day (earwigs like to be cool).

Since you will need to take the hotels down to count the residents, please don't put them somewhere hard / dangerous to reach!

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On a tree.

Position the hotel where a branch meets the trunk.

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Against a tree.

Fix the hotel onto a ~50cm stick and lean it against the trunk.

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On a stick.

Fix the hotel onto a ~50cm stick and position it over some ground cover.

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Straw / leaves hotel.

Using straw / leaves / general dry plant bits.

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Against a fence.

Fix the hotel onto a ~50cm stick, and rest it against a fence or other vertical structure.

Counting the hotel residents

To work out which hotel style earwigs like best, we need to count how many visitors you get to each one by emptying out the hotels into e.g. a large tray.  These counts will be done once a week, starting the week after you begin.  While we are focusing on earwigs, it would also be interesting to find out what other kinds of inverebrates might be using the hotels - so you will need to count everything.  Only identify everything else to a level you are comfortable with - 'spider' and 'beetle' are fine! (Photographs are always useful to us if you can take them.)

Identifying earwigs should be easy - there are very few other insects that look anything like them! Adult males and females can be told apart by the shape of the cerci (pincers) on the end of their abdomen. Males have curved pincers, females have straight ones; juveniles have straight ones as well but are smaller and paler. overall.  Adults also have wings that are folded up very neatly by their 'shoulders' - looking like a small cloak.

A particularly fiesty earwig might try to pinch your finger, but the cerci are very weak and not sharp or venomous!

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Adult male European earwig (Forficula auricularia). Photo by 'Hedera.balitica', 2018, Flickr. CC BY-SA 2.0

Adult female European earwig (Forficula auricularia); top. Nymph, below. Note colour difference and wing cases. Photo by Judy Gallagher, 2020, Flickr. CC BY 2.0

The difference between adult male (eft) and female (right) earwig cerci / pincers. Image from Wisconsin Agriculture.

Frequently Asked Questions - Earwi'GO!


1. Can I do more than one location?

You can if you like, but you will need to do all three types of hotel in each place, which might
be a lot. Feel free if you want to try though!

2. I wasn't able to start in June / only just found this project / missed a week.
   Is this a probem?

Nope!  While we would ideally like as many records over the full time period as possible, we recognise that this might be a big ask.  Do what you can, and just make sure to fill in the dates on your recording sheet.

3. About the 'going in your ear' thing...?

A myth, and a silly one! While earwigs show 'positive thigmotaxis' (a fancy term for liking to be in small spaces, and clustered together), your ear really isn't a good hotel. Too warm, too waxy, too loud and - unless you are prone to going to sleep with your head stuck in a tree - not very accessible!

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