Archive for October 2011

Attack of the Pine Bark Beetles

Removal of diseased white pines. photo credit: W. CostelloThis past spring and summer, two mature white pines (Pinus strobus) at the rear of Bond Lodges along Chester Road, suddenly turned brown and died. The first one went off color during Commencement week at the end of May. A visual inspection of the trunk and top with binoculars gave no indication of cause. Not long after that, the second tree started to go off-color and inspections found small mounds of sawdust mixed with sap on the trunk.

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Southern Pine Beetle infestation. photo credit: W. Costello

This was an immediate indication of some type of bark beetle, but …

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Plants of the Week: October 24

Oxydendrum arboreum Cunningham House (2) JWCOxydendrum arboreum transitions to its fall adornment between the Cunningham House and the Wister Center. This small native tree can be found from New York, south to Florida, and west to Arkansas. For success, plant sourwood in acidic soils in a location with limited root competition. Fall color ranges from red and scarlet to maroon and plum. Photo credit: J. Coceano

Allium thunbergii 'Ozawa' (2) JWC

While a majority of alliums bloom in the spring and summer months, some, including Allium thunbergii ‘Ozawa’ help conclude the growing season, blooming through October and November. Plant the rhizomatous, bulbous perennial in fall or spring. Tufts, 9 to …

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Plants of Week: October 17

Clethra tomentosa 'Cottondale' (2) JWCTucked along a pathway in the John W. Nason Garden, one is most likely to first experience the fragrance of Clethra tomentosa ‘Cottondale’ before meeting the plant. A cultivar selected from our native woolly summersweet, C. tomentosa ‘Cottondale’ bears long, pendulous racemes of fragrant white flowers and serrated leaves covered in fine hairs which lend a gray cast to the plant. Provide full to partial sun in a moist site for optimal growth. Photo credit: J. Coceano

Carya ovata fall color detail (1) JWCHickories can always be counted on to lend vibrant shades of yellow to the autumn landscape. Carya ovata, the shagbark hickory, is …

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