Ants and aphids have a symbiotic relationship. Re your images of sycamore aphid - they are indeed Drepanosiphum platanoidis, in fact a MALE of the species. The body length is 3.2-4.3 mm. Am I right this time? I wondered whether it was one of the non-illustrated species in that area. And it only takes a few predators per plant to significantly cut down on the number of bugs. The aphids that develop from the overwintering eggs in spring (the fundatrices) are always green often with bold black transverse bars on the abdomen. Call in a professional for larger trees. This is indeed Depanosiphum platanoidis - brown forms are more common later in the season. This suggests there is an interval timer mechanism controlling the develoment of red forms similar to the mechanism which restrains the appearance of sexual morphs early in the year. These two images show the aphid 'mummy' resulting from attack by the specialist braconid parasitoid Dyscritulus planiceps (sometimes wrongly named Discritulus planiceps). The point is to illustrate how individuals in a population may be distributed and to test a null hypothesis of randomness that, if rejected, suggests a host … [Below] are 3 images of what I think may be the Common Sycamore aphid. This is indeed Depanosiphum platanoidis - brown forms are more common later in the season. There are many different species of aphids which vary in colour from green to yellow and black. Freshly laid aphid eggs are pale yellow to green, but soon darken to shiny black. Thank you. There is an ongoing dispute as to whether Sycamore is a native British tree, but is now by far our commonest species of maple. 4). The picture above shows a young nymph of Drepanosiphum platanoidis on a sycamore bud in March. Among protogynous trees differences in seed set between the two pollination treatments were significant in eight out of ten trees whereas in the other sexual morph it was only in one tree. Sycamore aphid, Drepanosiphum platanoidis Koch. Such movement is not restricted to alates and both alates and nymphs can often be found in large numbers on adjacent unsuitable hosts. Re your images of sycamore aphid - they are indeed Drepanosiphum platanoidis, in fact a MALE of the species. Egg mortality varies from 65-85% with the greatest mortality in late winter (Wade, 2002). The alate female Drepanosiphum platanoidis has a yellow-brown head and thorax with darker brown markings. The Many aphids, especially those on fruits and vegetables, go through an annual cycle that involves two or more host plants. But it was of interest seeing the Anthocoris nemorum - we had simply masses last summer (I always hope I can find the similar but rarer species, but have effectively given up now). 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Bob, Influentialpoints: We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. If the alate develops in spring or autumn, it has variably developed dark cross-bars (see second picture below), but if it develops in mid summer, there are no cross-bands and the aphid is generally paler (see third picture below). Sycamore, London plane tree—Platanus spp. The antennae are brown, and the siphunculi are pale with a brown tip. Sycamore aphids are not attended by ants, but vespids can often be found gleaning the honeydew from the leaves (see picture below). Aphids on the leaf buds of a sycamore (acre) tree On July 4th, 2019, a car stands on a street in Berlin-Weissensee (Pankow district) under a blossoming linden tree. Very few nymphs are present at this time of year, because most of the adults undergo a reproductive aestivation or diapause.Note the globules of honeydew (sugar-rich aphid excretion) on the leaf - unlike some aphid species, Drepanosiphum platanoidis is not attended by ants feeding on this secretion. The common sycamore aphid is found on the undersides of leaves of sycamore (Acer pseudoplatanus). Nigel Gilligan, 17 March 2014, another Drepanosiphum platanoidis maybe. This ovipara is dark green with dark bands, but colour varies from light green to dark brown and bars may be present or completely absent. The first image shows the adult braconid Dyscritulus planiceps which emerged from the mummy of a sycamore aphid shown above. They are also usually green as in the picture below. Diversity is highest on trees, where more feeding niches are available. Ants and aphids are mutually beneficial to each other, as aphids help provide food for ants. 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In the spring, the eggs hatch and the aphids feed on the young foliage. Spray the tree until the insecticide drips from the foliage. Bob, Influentialpoints: Try a hardier species. Sycamore aphids aggregate on particular leaves, but maintain a minimum space between each other (Kennedy & Crawley, 1967) giving the spaced-out pattern. Both types are more common when there are high densities of fourth instar nymphs. Two types of flights have been distinguished for sycamore aphids: trivial flights and migratory flights (Dixon, 1969). 05), and the seasonal pattern differed in that the aphids remained at low densities after the summer decrease ( Fig. However, I think this one has the definite form of a Drepanosiphum, looking quite similar to D. platanoidis, but much darker, with mid-browns and blacks predominating.
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