Tag Archives: Coreus marginatus

On Common fleabane: bugs and crickets

21 Friday Aug 2026

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The subjects of today’s blog about those insects managing to survive this over-heated summer by feeding on Drought-tolerant Common fleabane are bugs, and two examples of one cricket species, because I managed to find both male and female. Let’s begin with bugs …

Two Lucerne bugs (Adelphocoris lineolatus), pretty little things but both trying to hide from me.

I actually saw quite a few Common froghoppers (Philaenus spumarius), and in several of their wonderful variety of brown-and-cream pattern variations.

Clad in its brown armour-like skin and looking ready for a fight, a Dock bug (Coreus marginatus).

An adult Hairy shieldbug (Dolycoris baccarum). (I’ve found quite a lot of nymphs of this species recently and feel they deserve their own blog – you’ll see why soon.)

And now for the crickets. These are Long-winged cone-heads (Conocephalus fuscus), a type of bush-cricket. I’ve just realised that this species has only featured on this blog once before, in July 2020, when I included a photo of a nymph in the post 202/366 More misc minis. The first photo shows a female, though, unfortunately, her impressive ovipositor is mostly obscured; the second image is the male, with a much smaller appendage.

Sunbathing bugs

16 Wednesday Mar 2022

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The shallow bowl shape of the leaves of Winter heliotrope were perfect for the bugs enjoying Monday’s warm spring sunshine. In one small sheltered area I found several Common green shieldbugs (Palomena prasina) . . .

220316 common green shieldbug

two Hairy shieldbugs (Dolycoris baccarum) . . .

220316 hairy shieldbug

and two Dock bugs (Coreus marginatus).

220316 dock bug

Bugs are like buses

16 Thursday Aug 2018

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I hadn’t seen any Dock bugs (Coreus marginatus) for a couple of months and then suddenly, at Cosmeston the other day, I saw 11 on one plant!

180816 dock bugs (3)

Now that I’ve read up on them, I understand the sightings gap: it seems adults mate and lay their eggs in the springtime, the nymphs munch away on dock and their other favourite plants for a couple of months and, by August, they have developed into new adults. And here they are …

Dock bug baby

05 Tuesday Sep 2017

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I blogged about the Dock bug (Coreus marginatus) back in October last year and mentioned then that, in common with most bugs, these mini-beasties go through five larval / nymph stages before they become adults, though I had only ever seen the adult bugs … until yesterday.

170905 Dock bug Late instar (1)

I was indulging in the odd mouthful of ripe blackberry as I wandered around Cathays Cemetery when my hand was stopped in its reach by the glare of this little critter. It obviously had its eye on the succulent ripeness of that very same blackberry and was certainly not going to be intimidated by any gigantic human hand reaching towards it. I relinquished the berry!

170905 Dock bug Late instar (2)

Dedicated to the Dock bug

17 Monday Oct 2016

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When the Dock bug found out that his cousin the Green shield bug had received a blog post all to himself, he was not amused. Was he not as lovely? Was he not as worthy of attention? Well, yes, angry little Dock bug, you most certainly are, so here is your moment in the spotlight!

161017-dock-bug-1

Coreus marginatus is the Dock bug’s scientific name, and he’s a largish (13-15mm), broadish, reddish-brownish sap-sucker. Luckily, his sap-sucking is restricted to the leaves of docks and sorrels so he’s not the pest that some other members of the squashbug (bugs on squash plants) family can be.

161017-dock-bug-2

Mr and Mrs Dock bug seek each other out in the springtime to create the new generation, then, once hatched, their offspring, like most True bugs, go through five nymph stages before emerging as adults from about August. I’ve only ever seen the adults, in the shrubs, bushes and hedgerows alongside many of my walking trails, but there are plenty around – three sitting close together on one sunny leaf just last week. As well as inhabiting much of southern Britain, the Dock bug can also be found throughout Europe, in many Asian countries and in parts of North Africa.