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Showing posts from March, 2010

Emerald Ash Borer is found in Minneapolis

Minnesota Department of Agriculture news release

The Minnesota Department of Agriculture (MDA) confirmed on Thursday February 25 an emerald ash borer infestation in four trees in the Prospect Park East River Road neighborhood of Minneapolis within Tower Hill Park. This infestation is within a mile of the St. Paul neighborhood in which the tree pest was found last year.

Photo 1: Emerald ash borer galleries. Jeffrey Hahn. The infestation was discovered through an ongoing survey of ash trees in the vicinity of the South St. Anthony Park neighborhood, where EAB was found in May 2009. While this marks the first time emerald ash borer has been found in Minnesota outside Ramsey County, state officials said the discovery was anticipated. Last fall, scientists determined that the St. Paul infestation had been in place for about three years prior to detection. Since the adult beetles can fly up to 2 miles each year, officials expected that the bug had spread into Minneapolis.

There is quaranti…

Pruning Flowering Shrubs to Maximize Bloom

Kathy Zuzek, University of Minnesota Extension Educator

The optimal time of year to prune deciduous shrubs is in late winter and early spring before bud break. Healing of pruning cuts is rapid as spring growth starts and pests that could infect or invade open pruning wounds are dormant in winter. But if maximizing bloom on deciduous shrubs and trees is important, pruning times may change.

Generally, shrubs flowering later in the season (hydrangeas, summer-blooming spiraea, and potentilla), flower on current season's stems, commonly referred to as new wood. These shrubs can be pruned in late-winter to early spring without reducing bloom.

Spring flowering shrubs (forsythia, bridal wreath spirea, and rhododendrons) generally flower on the last year's stems, commonly referred to as old wood. These
shrubs are best pruned immediately after flowering to conserve next year's bloom.

To more fully understand how and when spring blooming shrubs form buds on new and old wood,  enlar…