September 17, 2013
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The effect of last summer’s (2012) record-setting heat and drought is still being expressed by many trees throughout Michigan. A short drive around most parts of Lower Michigan will provide evidence of a bumper crop of cones on many spruce trees, especially white spruce, in yards and windbreaks (Photos 1-2).
In addition to the influence of tree stress on coning, many conifers also exhibit a pattern of biennial bearing that may also contribute to this year’s cone-ucopia. Spruce seed cones typically occur on the upper third of the tree, while pollen buds, which are fairly inconspicuous, occur on the lower third to reduce self-pollination (Photo 3). Some trees may produce enough cones to become somewhat unsightly and reduce this year’s shoot and needle growth. In the long term, however, Michigan State University Extension predicts there should be little long-term effects to trees due to the heavy cone crop. (Source: Michigan State University Extension – Departments of Horticulture and Forestry 9/2013)
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