Showing papers by "Jyoti Kumar Sharma published in 1977"

Some Aspects of Poplar Rust Research in Australia

Abstract: SUMMARY Clones of Populus spp. growing in a relatively uniform field environment near Canberra appear to differ in the form and degree of resistance to the two leaf rusts Melampsora medusae Thum, and M. larici-populina Kleb. There is evidence of considerable racial specialisation in both rust species and this has importance in future breeding strategies for poplar. Although both rust species occurred at low and high latitudes in eastern Australia in 1975, in midsummer M. medusae was most common on clones at low latitudes while M. larici-populina was most frequent on the same clones at higher latitudes. Fungal hyperparasites of both rusts are common in the field in autumn. A programme for further research on poplar rusts is outlined.

Infection of Populus alba var. hickeliana by Melampsora medusae Thüm.

Abstract: 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.