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Chestnut Blight produced by Cryphonectria parasitica (Murrill) Barr.

	Chestnut orchard in Sierra de Prades (Tarragona, NE Spain) The chesnut trees have all died because of the blight and the orchard is now abandoned.
	This branch died in one summer after the fungus attack.
	Leaves of dead branches do not fall in the autumn.
	The cracks in the branch insertion point are one of the possible ways for fungi to infect the tree.
	Canker produced by the fungus. The tree resprouts below the canker.
	Mycelium of the fungus growing under the sunk and reddish bark.
	Detail of the subcortical mycelium.
	Stroma of C. parasitica with fruiting bodies.
	Detail of the stroma.
	Perithecia ostioles outside the stroma.
	Cross section of the stroma showing perythecia cavities.
	Asci of Cryphonectria parasitica
	Virulent canker converted to hypo-virulent. The canker perimeter is surrounded by callus.
	Hypovirulent cankers affecting only the bark, and allowing cambium activity.

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This web page (http://labpatfor.udl.es/herbariovirtual/cryphonectria2.html) has been created by:

Carlos Colinas
Vegetal Production and Forest Science Department
University of Lleida

Last update: November 14th, 2004.