However (though not sure of the significance or correctness of this), I can see what appears to be a definite groove, which is curved, in front of the right-hand siphunculus. Except for infestations on monkshood (Aconitum napellis), which is sort of out-of-season. I can see why you went for Uroleucon sonchi - it is smooth - but that species definitely has the cauda much paler than the siphunculi. This one has a structure more like a beetle for instance, with a distinct abdomen and thorax, and projections at the side, which I assume have nothing to do with wings.) Other plants in this family include delphinium, meadow rue, clematis and buttercup.
Is that any use? We have used the keys and species accounts of Nigel Gilligan, 15 March 2014, Uroleucon sonchi, but maybe wrong colour
It occurs in north-west and central Europe, and eastward into Russia. The siphunculi do appear to be less than twice the length of the cauda, but the bases are pale, as is the cauda - which does not seem right either. A genus of flowering plants belonging to the buttercup family and comprising poisonous species and members popular for horticulture But I may be some time. Is it still Delphiniobium janackianum? No need to register, buy now!
There are very few photos of it on the web and they show it markedly paler than yours, but one would expect colour to vary somewhat. The aphids live primarily on the upper parts of the stem and between the flowers. How to grow: Monkshood. Yours has a black cauda. The leaves of the monkshood plant are palmate, meaning hand shaped, with lobed “fingers” that often have toothed edges and vary in color from light to dark green.
Flower plant delphinium monkshood wildflower, Plant Stem, Hyssopus, Bellflower, Perennial Plant free png ), so I don't tend to come across aphids much. This unusually smooth aphid looks like Uroleucon sonchi, except that it is a dark bottle-green, not dark brown. Ah, that is good news. The showy blooms grow 3-4 feet tall and perform best in partial shade and consistenly moist soil. Growing 2 to 4 feet (0.5 to 1 m.) tall and 1 to 2 feet (0.5 m.) wide, perennial monkshood is best grown as a background plant. Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. I'm fairly certain about this, but if you can get some photos of it on the plant this year, it would be conclusive. So that is as far as I could get with that one - I could see no species like it in the species detail section. All parts of Aconitum, especially the roots, are full of an alkaloid called aconitine. It doesn't look exactly like the one I had a possible ID on last year - this one is a blue-green colour. Sorry about the slight delay - this aphid took a bit of time. The colour of aphids often varies a bit seasonally. I have just done a quick trawl through the garden, but either it's not about yet, or I don't recognise it as that scale. Several photos taken, but I ought to get more.
Delphiniobium junackianum is found in north-west and central Europe, eastward to west Siberia. Aconitine first stimulates and later paralyzes the nerves of pain, touch, and temperature if applied to any mucous membrane. [Don't know what plant species it was on.] They form colonies on Aconitum and Delphinium spp, mainly on the upper parts of stems and between flowers. Biology & Ecology: Nigel Gilligan, 18 March 2014, Genus Metopeurum, maybe
That has had dark aphids in the autumn, badly. I mean it's the lack of an elongate or shorter bulbous shape. So, I will keep trying but don't hold your breath. But I don't let that put me off since aconitum, a relation of the delphinium, adds welcome stature and a unique flower shape to the summer border. Aconites (I imagine you mean Monkshood as it looks similar to previous pair) are highly TOXIC . If I was able to identify the plant that the blue-green 4th instar is on (it does look like a food plant), then you might stand a chance? Siphunculi are 1.1-1.3 × cauda and 0.15-0.19 × BL, and mainly dark except at their bases. Without a definite host plant, I can't key it out. Without either host plant or an adult, I would just be guessing if I tried to identify it. The body size is within parameters - I would have estimated between 3 & 4 mm long. I have not been seeing any except a solitary Depranosiphum platanoidis (on a hawthorn), until today, when I spotted the first aphis on our Monkshood. This one is different, in that the basic aphid shape is not there, and the only one in the outline page on aphids that has any similarity of form is the photo for Metopeurum. I strongly suspect that this is the species.
The only other useful thought I have had is that we never get infestations of aphids here (too many controlling inverts? Dec 29, 2013 - ChiloquinNews article 8/8/11 Larkspur and Monkshood are both tall and stately plants with spikes of rich blue flowers, and they are prized cottage garden plants.
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