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Light Sensitivity of the Antagonism of Cladosporium Species to Races of Melampsora larici‐populina Kleb. on Cultivars of Populus × euramericana (Dode) Guinier
Author(s) -
Sharma I. K.,
Heather W. A.
Publication year - 1983
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1983.tb00060.x
Subject(s) - cladosporium , biology , botany , antagonism , cultivar , colonization , light intensity , horticulture , ecology , penicillium , biochemistry , receptor , physics , optics
Antagonism of five species of Cladosporium to production of uredinia by three races of Melampsora larici‐populina on leaf disks of poplar ( Populas × euramericana ) was generally higher with races A and E but lower with race D, at high light intensity (400 μ Em −2 s −1 ) than at low light intensity (100 μ Em −2 s −1 ). Colonization by all species of Cladosporium , of the uredinia induced by the races on the cultivars, was higher at the low than at the high light intensity. The extent of reduction in colonization with increasing light intensity depended on the race, cultivar and species of Cladosporium involved. While the species of Cladosporium was the most important major factor affecting both uredinial production and colonization, race, cultivar, light intensity of incubation and species of Cladosporium interacted significantly to determine disease level (uredinial number) on the leaf disks and the percentage of these uredinia subsequently colonized by the Cladosporium spp.