Archive for August 2009

Dogwood Sawfly

Dogwood sawfly, Macremphytus tarsatus. photo credit: W. Costello

Dogwood sawfly, Macremphytus tarsatus, has been found on shrubby dogwood species on campus. While this pest looks like a caterpillar, it is actually the larval stage of a wasp-like Hymenoptera species.

Adult sawflies emerge in late spring and lay their eggs on the undersides of leaves. When the eggs hatch in mid-summer, the first stage larvae are tiny, yellow, and translucent. As they grow and molt, they become covered with a white waxy coating. They usually spend the daylight hours curled up and clinging to the underside of leaves. They can be quite gregarious, with a dozen or more …

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Sanguisorba tenuifolia ‘Purpurea’

Sanguisorba tenuifolia 'Purpurea' photo credit: S. Keitch

The Japanese burnet is a plant that I have only observed on a few occasions, but it has always left a lasting impression. Lately I have been admiring a planting of Sanguisorba tenuifolia ‘Purpurea’ near the Sproul Terrace steps. Its burgundy red flowers bobbing in the air are hard to miss. The size of this plant is not overwhelming, even though the foliage reaches a substantial four feet in height. The bulk of this plant’s body remains close to the ground, consisting of long compound leaves in a basal arrangement. If you do not want to focus on flowers, one …

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Clematis ‘Rooguchi’

Clematis 'Rooguchi' photo credit: Scott Arboretum Archives

Clematis ‘Rooguchi’ is an exciting new clematis selection. It blooms all summer long with pendant, bell-shaped, deep purple flowers which entirely cover of the vine. At maturity, it only reaches six feet tall, so it is a perfect subject for growing in a container or growing up through another plant.

At the Science Center, it uses a cascading, cut-leaf Japanese maple as a living trellis by clambering up and through the branches. At home, I have one that climbs up and over a shrub rose. ‘Rooguchi’ is a hybrid between C. integrifolia and C. reticulata. This hybrid will climb …

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