Abstract
Abstract A description is provided for Microsphaera sparsa . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Powdery mildew of Viburnum species only. Mycelium, conidiophores and conidia can develop visibly only on the upper surface of leaves, but damage is usually not substantial and the ornamental quality of plants is rarely significantly harmed. HOSTS: Viburnum acerifolium, V. affine, V. alnifolium, V. cassinoides, V. cotinifolium, V. dentatum, V. dilatatum, V. erosum, V. foetidum, V. lentago, V. opulus, V. opulus var. americanum (V. trilobum), V. phlebotrichum, V. plicatum, V. prunifolium, V. pubescens, V. rafinesquianum, V. rufidulum, V. sargentii, V. scabrellum, V. sieboldii, V. trilobum, V. tinus, V. wrightii . [Type host - Viburnum lentago ] GEOGRAPHICAL DISTRIBUTION: Asia (temperate areas only): China, Republic of Georgia, India, Japan, Kazakhstan, Russia (Altai, Russian far east, North Osetia, western Siberia). Australasia: New Zealand (introduced). Europe: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Hungary, Italy, Latvia, Lithuania, Netherlands, Norway, Poland, Rumania, Russia (European part), Slovakia, Sweden, Switzerland, Turkey (European part), Ukraine, former Yugoslavia. North America: Canada, USA. TRANSMISSION: By wind-dispersed conidia. The rôle of ascospores in disease transmission is unknown, although it has been supposed that they can cause the initial stage of the disease.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
