|Title:||PATHOGEOGRAPHIC STUDIES OF SUGARCANE DOWNY MILDEW IN TAIWAN III. A COMPARISON OF CLIMATIC CONDITIONS IN FOUR PATHOGEOGRAPHIC REGIONS||Other Titles:||臺灣甘蔗露菌病病害地理之研究 III.病害地理區域氣象因子之比較及品種發病與氣象因子之關係||Authors:||E.S. Poon
|Keywords:||climatic factors;pathogeographic regions;varietal infection;氣象因子;病害地理區域;品種發病情形||Issue Date:||Jun-1982||Publisher:||植病保護學會||Journal Volume:||24||Journal Issue:||2||Start page/Pages:||121-129||Source:||植物保護學會會刊||Abstract:||
The climatic conditions of four pathogeographic regions of sugarcane downy mildew as represented by Huwey (sporadic region), Hsinying .(main damae region), Pingtung (marginal damage region) and Taichung (nonepidemic region) were compared. No striking difference in the annual means of different climatic factors and the climatic patterns for the different months can be identified to account for the difference in disease intensities in the pathogeographic regions. The dynamic disease patterns of the period studied (1965-1978) does not correspond to the dynamic of climatic conditions. In a qualitative analysis of the records, none of the weather variables of the four months (the disease onset period) studied can be used to distinguish epidemic and nonepidemic years and no distinct climatic trend can be found in epidemic years that deviate from the climatic conditions of normal years. Quantitative analysis of the relationship between infection on F160 and F155 and climatic factors in Pingtung was conducted. Disease on F160 appeared to be associated with the amount of sunshine while high temperature and low humidity appeared to be associated with lower level of disease on F155. Failure to identify the relationship between climate and disease was attributed to the irrelevancy of macroclirnatic data since the downy mildew pathogen is highly sensitive to microenvironment which is crucial to disease development. It is also suggested that host factor may play a more important rote other than the climatic factors in the sugarcane downy mildew disease.
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