First report of bacterial leaf blight of white-flowered calla lily caused by Xanthomonas campesMs pv.zantedeschiae in Taiwan

摘要

Leaf blight symptoms on white-flowered calla lily(Zantedeschia aethiopica)were observed during spring of 2002 and 2003 in some nurseries in the Yang Ming Shan area,Taipei,Taiwan.The symptoms first appeared on the lower sides of leaves as small spots.The centres of the spots quickly turned brown and were surrounded by yellowish halos.The brown spots and halos enlarged rapidly and coalesced into irregular,dry,necrotic lesions.Some of these necrotic lesions became torn and partially detached or with a shot-hole effect.These symptoms are as described for Xanthomonas campestris pv.zantedeschiae(Joubert & Truter,1972;Bradbury,1986).