Category Archives: trees

Galls: Eriophyes similis

12 Friday Jun 2026

Posted by in insects, leaves, trees

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I think I’m safe in saying that not many, if any of my readers spend as much of their time staring at, turning over, or fossicking among leaves as I do. So, you may not have noticed that, at this time of year, many of the leaves on Blackthorn (or Sloe) trees (Prunus spinosa) develop lots of little lumps and bumps.

These are galls, caused by the tiny mites Eriophyes similis. My Field Studies Council guide to galls explains that ‘mites are small enough to pierce and feed on individual plant cells, and by so doing to cause surrounding cells to enlarge and multiply.’ The galls start out green and gradually turn a pinkish colour., as shown in my photos, and are often found around the edges of the leaves. This mite species appears to have had a recent change of name, as many older publications label them as Eriophyes spinosae.

Peak Wild garlic

26 Sunday Apr 2026

Posted by in insects, spring, trees, wildflowers

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It’s peak Wild garlic flowering time in my local green spaces, making a visit to my local park a culinary experience – the smell is so strong you can almost taste it in the air!

On Wednesday I went for a stroll through Cwm George woodland, a local hotspot for Wild garlic (or Ramsons, if you prefer; Allium ursinum), and it was just glorious.

The lush green swathes of Wild garlic, with their abundant brilliant white flowers, looked so picturesque carpeting the earth beneath the towering Beech trees and garlanding the edges of the woodland pathways.

And it wasn’t only the human visitors who were appreciating the profusion of flowers. Flies and bees of many species, hoverflies, butterflies and beetles were all lapping up this springtime feast.

Blackthorn in bloom

11 Sunday Jan 2026

Posted by in flowers, trees, winter

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This winter season continues to provide phenological surprises. I saw my first Blackthorn blossom on Christmas Eve, during a quick visit to Cosmeston Lakes Country Park to provide an early Christmas dinner of berry-flavoured suet pellets to my crow friends.

And then, during yesterday’s walk, which took me through fields perhaps half a mile north of the country park, I found another Blackthorn tree with blossom open on a couple of its branches – this despite several very cold days and a bit of blasting from (though we missed the worst of) Storm Goretti.

Q is for Quercus

22 Monday Dec 2025

Posted by in fungi, insects, trees

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As I know I’ve stated on this blog many times before, the various species of Oak tree (Quercus species) play host to a huge number of organisms of many types, forms, and colours. These are some I’ve been lucky to see this year: two species of fungus, the Oak mazegill (21 November) and Black bulgur (Fungi: Black bulgar, 24 October); several species of bug that have all featured in this update already (B is for bugs and beetles) but are worth another mention as they spend all or most of their lives on Oak trees: Cyllecoris histrionius, adult and nymph (12 May), Rhabdomiris striatellus (10 June), and Bug: Megacoelum infusum (12 September).

I also managed to find several Common quaker (Orthosia cerasi) caterpillars on a single Oak (included in Cool cats, 2, 5 June); the gorgeous lacewing shown above that has since been verified as Hemerobius micans and is found especially on mature oaks (Two lacewings, 4 September); the folded-over Oak leaf lobes created by a gall midge (Galls: Macrodiplosis pustularis, 2 June); and the stunning little Acorn weevil, shown below, that lives in Oak trees and lays its eggs inside acorns (Weevil: Curculio glandium, 1 August).

Aphid: Eriosoma lanigerum

01 Monday Dec 2025

Posted by in insects, plants, trees

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When I set out on my walk last Saturday, I wasn’t intentionally targeting aphids but up they popped. At this first location I wasn’t completely certain that what I saw was caused by aphids but, as soon as I poked one of the fuzzy white lumps on this Firethorn (Pyracantha species) and my finger came away stained red, I knew I’d just inadvertently squashed an aphid (this has happened to me before when I grabbed a willow branch without noticing the aphids perched on it).

After a little research when I got home, it quickly became apparent that these were Eriosoma lanigerum, also known as Woolly apple aphids and American blight. The sap-sucking feeding of Eriosoma lanigerum causes deformation and swellings on the branches, trunks and roots of their host plants, as you can see from the lumpy growths on the branches of this Firethorn bush.

The white ‘wooliness’ is a wax substance the aphids produce in specialised glands and excrete as filaments from various parts of their bodies. The Influential Points website, which is an excellent resource for information about aphids, summarises the various reasons scientists have reached for this wax secretion:

Smith suggests that the primary role of the secreted wax is to prevent the aphids becoming contaminated by their own honeydew … and that of other members of the colony…. Other secondary roles of wax may include individual microclimate isolation, protection from fungi, parasites and predators plus waterproofing and frost protection.

Though their primary plant hosts are Pyracantha and Cotoneaster species, as the Woolly apple aphid name suggests, their secondary host is Apple and, on the various species of Apple trees, they are considered a major pest, often having a severe economic impact on Apple crops. If you’re interested in reading more about this, the Influential Points website has a long list of various scientific research papers from around the globe on the subject of these aphids, their reproduction habits, their seasonal movements, their genetics and population dynamics, as well as ways to control their infestations.

Autumn trees: Whitebeam

30 Sunday Nov 2025

Posted by in autumn, leaves, trees

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Whitebeam (Sorbus aria) is a tree I’ve overlooked until now, though I did take a few photos earlier in the year, of its smooth grey bark and its berries, before they ripened. (According to the Woodland Trust website, the berries ‘are known as chess apples in north-west England and are edible when nearly rotten’, which doesn’t make them sound very appetizing to me.)

Whitebeam’s leaves are quite distinctive: elliptical in shape with serrated edges, the upper sides a shiny dark green, the under sides light grey and hairy. In the autumn, they aren’t particularly spectacular, simply changing to yellow, orange, and brown as they lose their chlorophyll.

The Woodland Trust site has some interesting facts about this handsome tree:

Whitebeam timber is fine-grained, hard and white. Traditional uses included wood turning and fine joinery, including chairs, beams, cogs and wheels in machinery.

And

Whitebeam is native to southern England, though widely planted in the north of the UK. It is common in parks and gardens, but is quite rare in the wild.

And

The leaves are eaten by caterpillars of a number of moths, including Parornix scoticella, Phyllonorycter corylifoliella and Phyllonorycter sorbi.

All three of those moths have leaf-mining larvae, none of which I’ve yet seen, so I must keep an eye out next year.

Hawthorn flowering in November

26 Wednesday Nov 2025

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The Hawthorn (Crataegus monogyna) is also known as the May-tree, the only British tree to be named for the month in which it usually blooms. And, though its blossom does frequently appear a month or so earlier in the year, it does not normally flower in late autumn. Yet, this is what I saw on Sunday’s walk around the edge of my town, a Hawthorn in bloom and bearing berries. Mine is not the only sighting of this unusual phenomenon; when I posted a photo on social media, I was alerted to reports of at least three similar sightings across the UK, and I’m sure there must be more. If anyone ever doubts how much our climate is changing and how this will affect our natural environment, our flora and fauna, occurrences like this should be enough to banish those doubts.

Autumn trees: Ash

23 Sunday Nov 2025

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My Flora Britannica contains a myriad of fascinating information about the Ash tree (Fraxinus excelsior) but nothing that specifically relates to the tree in autumn. So, I googled “Ash keys”, thinking that might turn up some interesting facts. The AI overview produced this rather bizarre result:

“Ash keys” can refer to the winged seeds of an ash tree, which are used in poetry collections, or a caravan park in Yorkshire, UK. The ash tree seeds are a common sight in autumn and are also used to make pickles.

Yes, I was expecting the ‘winged seeds of an ash tree’ but ‘used in poetry collections’? (Turns out, there’s a book of poetry called Ash keys.) And, yes, ‘ash tree seeds are a common sight in autumn’ but are they really used to make pickles? (Turns out, this can be done but is an incredibly long-winded process, using a lot of electricity for multiple cooking stages and spices to create flavour, and is surely neither environmentally friendly nor worth the effort.) You may have guessed I’m no fan of AI!

So, here’s one of the much more interesting pieces from Flora Britannica instead:

In Britain, up until the end of the eighteenth century, it was regarded as a healing tree, and Gilbert White knew Hampshire villagers who, as children, had been through an Ash ritual as a ritual as a treatment for rupture or weak limbs. It was an extraordinary ceremony, a relic of pre-Christian sympathetic magic. A young Ash was split and held open by wedges, while the afflicted child was passed, stark naked, through the gap. The split was then ‘plastered with loam, and carefully swathed up. If the parts coalesced and soldered together … the party was cured; but, where the cleft continued to gape, the operation, it was supposed, would prove ineffectual.

Birds and Buckthorn berries

17 Monday Nov 2025

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Last Wednesday’s weather was dreich. (Are you familiar with that word? It’s Scottish English, a word I learnt when married to a Scotsman and from having lived for a few years in Scotland. It means bleak and dreary, and is the perfect descriptive for much of our recent weather.)

Back to last Wednesday … it was too bleak even for me to go out walking so, while sitting at my dining table/desk, deliberately placed by my living room windows for maximum external views, I had one eye on any wildlife activity happening outside.

Though the berries on this Buckthorn tree had looked ripe for a week or more, the birds chose this particular day to begin selecting the most juicy plump fruit to eat. As I watched, first male and female Blackbirds flew in and began scoffing the berries. Then, the Woodpigeons turned up, the branches of the tree drooping and swaying under their weight. And, lastly, a handsome Song thrush appeared to join in the feast.

As my photos were taken through rain-covered double-glazed windows, they’re not very sharp but I thought they were still worth sharing. Watching all these beautiful birds certainly cheered a very grey day.