Pruning prior to bud break can remove many of the eggs that overwinter on canes. As I wrote about it in the paper, “Etymology.—This species is named in honor of Claus and Helga Glawatz, parents of Gina Rone. This plant has a similar over-wintering strategy as L. lewisii, discussed above, in that it overwinters with basal leaves intact, and ready to grow immediately in spring. As I worked my way back toward the tent where Gina and Bumble still lounged, a man and a dog came down the trail! J. Genet.  It infests rosebushes as its main host in spring and early summer, congregating on the tips of shoots and around new buds. Later in the summer, winged forms move to other rose bushes, or to a limited number of secondary hosts, before returning to rosebushes to lay eggs in the autumn. As I wrote about this back in 2000 (see reference above): “The heteroecious life cycle of this species is reported here for the first time. Dixon, eds. It is the aphid that occurs all across most of the world on cultivated roses. Both of these plants are perennial, and remain vegetative throughout the summer months. These migrants move to Pteridium, and produce small populations on this host. The main distinction between them is the number of setae on the cauda, but other features seem to vary by species as well. This species is one of many that are very similar morphologically to M. euphorbiae, but that have distinct biology and ecology. Host plant alternation in two fern-feeding Sitobion Mordvilko. Macrosiphum rosae, the rose aphid, is a species of sap-sucking insect in the family Aphididae. 1993. Reproduction begins again in September, usually on the lower or most yellow leaves. Genet. Wingless adults have a spindle-shaped body and are between 1.7 and 3.6 mm (0.07 and 0.14 in) long, slender, varying in colour from green to pink and reddish-brown. In 2012 I published a paper that included what i knew about this interesting aphid: In that paper I wrote, “Host plants I have witnessed this aphid reproducing on in nature include: Apiaceae – Lomatium sp. InPopulation structure, genetics and taxonomy of aphids and Thysanoptera (eds.) Potato aphids disperse to other plants during summer and may be found on a very wide range of host plants during this period. Maturing rapidly, females breed profusely so that the number of these insects multiplies quickly. This host range, which includes a non-native tree (Liquidambar), is broader than most aphids, and might be viewed at first with skepticism. Considering this and their estimated time of diversification of L. lewisii from its Eurasian relatives (3.8-3.3 million years ago), they thought it likely the ancestor of L. lewisii colonized North America via the Bering Land Bridge. In 1994, males were quite easy to find throughout my normal collecting areas in McDonald State Forest. The life cycle involves two hosts. Transfers of this aphid to a species of Dryopteris and to A. filix-femina were not successful. Populations of the rose aphid (Macrosiphum rosae) from various latitudes show differences in their life cycles. The plant is an inhabitant of wet places like swamps and wet meadows, but in practice the commonest place to see it is in roadside hedgerows. Organic Pesticides I published this species in 2000 and wrote about it, “Macrosiphum holodisci was originally discovered on its host, Holodiscus discolor (Pursh) Maxim. I covered this species in my 2000 paper, as follows, “The description and figures by Essig (1942) are adequate. In one location in Utah, in the hills above Salt Lake City in the fall, I was collecting Macrosiphum on the leaves of both Rudbeckia and Agastache in the same location as was M. euphorbiae. This aphid turns out to be quite common and widespread. It is most often found in mountains and foothills.”. Jensen, A.S. and J. Holman. This common species is one of the biggest and spindliest aphids I know. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Reproduction begins again in September, usually on the lower or most yellow leaves. This occurred even though populations of the aphid overall were not dramatically higher than other years.”. Since the original description I have found this aphid in many other places, and its known range now includes British Columbia, Washington, Oregon, Idaho, and Montana. Section 18 Exemptions The aphid is rare and difficult to find at times. During that time and in that location, it seemed to be anholocyclic on its hosts in the Saxifragaceae (e.g. J Holman, J Pelikan, A F G Dixon and L Weismann (The Hague: SPB Academic Publishing) pp. Adults are apt to drop when plants are disturbed.”. This is one of my two new species described in 2017. The early instar fundatrix of this species is also unusual in that it has pairs of dark sclerites on the abdominal tergites, and because it is a striking yellow color, while the adult is white.”. Aphids are very commonly associated with roses, particularly late in the season. Here, it lives throughout the year on the growing tips of ornamental trees of P. undulatum. 30: 155–174, Dixon A F G 1987 Aphid reproductive tactics. I was lucky enough to get some good photos over the years as well. Jensen, A.S. 2015. In the McDonald State Forest where I studied aphids for grad school, this aphid was fairly easy to find, but outside of that habitat I have searched hundreds or thousands of its hosts, Vancouveria hexandra, and found it only a few additional sites.
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