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http://dx.doi.org/10.5423/RPD.2004.10.3.175

Gymnosporangium asiaticum and G. yamadae: Morphological Characteristics, Pathogenicity and Epidemics by Rainfall  

Ryu, Jong-Suk (안동시농업기술센터)
Lee, Soon-Gu (안동대학교 생명자원과학부)
Publication Information
Research in Plant Disease / v.10, no.3, 2004 , pp. 175-182 More about this Journal
Abstract
Teliospores of two species of Gymnosporangium asiaticum and G.yamadae collected and identified from Juniperus chinensis, J.chinensis L.var.kaizuka. G.asiaticum was identified as the thick membraned (cell-walled) teliospores (avr 2.5 ${\mu}{\textrm}{m}$) and thin membraned teliospores (avr 1.2 ${\mu}{\textrm}{m}$), and the telia of G.asiaticum was bluntly conical shaped and occured on the leaves and branches of Chinese junipers. G.yamadae was identified as the thick membraned (cell-walled) teliospores (avr 2.5 ${\mu}{\textrm}{m}$) and thin membraned teliospores (avr 1.2 ${\mu}{\textrm}{m}$), and the telia of G. yamadae was gall or floral shaped and occured on the leaves and branches of Chinese junipers. Both of the telia of the two species of Gymnosporangium were occurred in a same tree of Juniperus chinensis L. var. kaizuka at the same time. But the dominant species is G. asiaticum. The more rainfall in the late of April (the season of forming basidiospore), the more rust diseases in Chaenomeles sinensis. C. sinensis, and Pyrus pyrifolia var. culta were infected by G. asiaticum (basidiospores) but Malus siebodii was not infected by G.asiaticum.
Keywords
Gymnosporangium; Morphology; Pathogenicity; Rainfall;
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