Thursday, 28 March 2013

Big Bud on Hazel


The buds of Hazel, Corylus avellana, are sometimes slightly pointed but are still characteristically Hazel, including the slightly fringed scales to the bud.


This bud is infected with Phytoptus avellanae, the Hazel Big Bud Mite, an Eriophyid mite. The highlights in this picture have been darkened a trifle. On the twig I think you can see the two types of hair found on Hazel shoots and petioles, the bases remaining of the silky silvery hairs, together with the stiffer, more bristly, maybe glandular, reddish hairs. The bud still has the silky fringes to the scales characteristic of Hazel. According to Wikipedia, two forms of P. avellanae exist, a gall causer and a vagrant form that has a more complex life-cycle and does not form galls


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