Mid-May

It is still cold so plants are late in flowering and insects on the wing are few in number much of the time. However, it has still been possible to find interesting things…..

A single leaf of Dryas octopetala (Mountain Avens) from Gualann na Leac on Raasay had a gall and leaf spots.

Dryas gall and leafspot

The leafspots are caused by the fungus Isothea rhytismoides but the gall causer is less certain. Following the key on Plant Parasites of Europe leads one to the chytrid Synchytrium cupulatum but a paper on nematode infections of Dryas in Perthshire has some similar looking galls caused by nematodes:

Nematode galls on Dryas

I shall have to go and get the leaf and dig into the gall.

New 10 km square records have been made for Hedera hibernica (Atlantic Ivy), Hyacinthoides x massartiana (Hybrid Bluebell), Prunus avium (Wild Cherry or Gean) and, by David H, Scutellaria galericulata (Skullcap).

I seem to have an aphids day yesterday. Following a lead from Murdo of HBRG I went to check for aphids on Viburnum opulus (Guelder-rose). He had found the aphid Ceruraphis eriophor at Strathpeffer and noticed that there was only one dot on the NBN Atlas for this species. I have often registered that on Skye V. opulus is infested with aphids and indeed the first plant I looked at had these on it (awaiting final confirmation). Later: Confirmed

Ceruraphis eriophor on Viburnum opulus

Meanwhile, Neil had spotted some clumping of leaves on Acer platanoides (Norway Maple) in a garden at Dunan.

I suspect that this is caused by maple leaf-nest aphid Mimeuria ulmiphila, a taxon that appears on NBN but with no records. Someone is going to have to knock on the door and say “Please can we get a ladder to look at your rare aphids?”. Hope that goes well.

Elsewhere, this leaf spot on Epilobium montanum (Broad-leaved Willowherb) appears to be Venturia maculiformis which is probably common but if so, very under-recorded.

Venturia maculiformis on Epilobium montanum

I have converted my moth trap so that it can be battery-operated.

Moth trap at Brae, Raasay

Its first outing at Brae produced several moths I haven’t seen yet this year at home such as Early Thorn:

Early Thorn

Without the aid of a trap, I found a nice Scalloped Hook-tip at Fearns:

Scalloped Hook=tip

Tags: , , , ,

One Response to “Mid-May”

  1. Early June | Plants of Skye, Raasay & The Small Isles Says:

    […] Debbie and I went to investigate the clumping of leaves on Acer platanoides (Norway Maple) in a garden at Dunan, but this was inconclusive, so we walked a stretch of the Broadford River. We […]

Leave a 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


%d bloggers like this: