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Coneless spruces

06.06.2009 - 00:45 |  Looduskalender
Text: Vello Keppart
Photo: Arne Ader
Translation: Liis from forum
 
So spruces look at this time in a "cone year".
 
Coniferous trees should now be spreading their pollen, turning the leaves of plants yellow from the abundant dust, and the rain into sulphur rain. Junipers and pines have plenty of pollen-emitting male cones, but our common spruce has no cones at all, at least in east Estonia. How does it happen that all common spruce trees unanimously abstain from producing cones, while there are new cones on foreign spruce varieties and firs? In 2009 there will be a shortage of spruce seeds, and it isn’t worth even dreaming of cone-laden boughs for Christma. Abundant cone years occur in intervals of (4) 5…6 (9) years for the common spruce. Years without cones are a sore trial for all animals who live off the cones. The numbers of cone–infesting pests are radically decimated too, so the following year nearly all spruce cones are undamaged and not attacked by the cone pyralid (Dioryctria abietella) or the spruce seed moth (Cydia strobilella).

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