The first record of infection of Populus alba var. hickeliana by the American rust, Melampsora medusae Thum. is reported. The morphology of uredospores of rust on P. alba is compared with that of other Melampsora spp. infecting white poplars. The implications of these observations for the widespread establishment in the future of white × black hybrid poplars are discussed. Copyright {\textcopyright} 1977, Wiley Blackwell. All rights reserved

Jyoti Kumar Sharma

Center for Environmental Sciences & Engineering

W. Heather A.

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