Epidemiological parameters of quantitative resistance to Peronosclerospora philippinensis (Western) Shaw in corn
1990
Raymundo, A.D. | Concibido, E.C. | Capio, E.R. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Plant Pathology)
The epidemiological components of resistance have to be known to predict the stability of resistant cultivars. These components, as they affect the expression of resistance to Peronosclerospora philippinensis (Weston) Shaw causing Philippine corn downy mildew were studied in selected populations and composites. Onset of systemic infection, apparent infection rate as a measure of disease progression, rate of colonization of individual leaves, time it takes to attain 100% chlorosis, sporulation, and area-under-the-disease-progressive curve (AUDPC) are the parameters that influenced the reaction of host genotypes to P. philippinensis. For instance, the onset of systemic infection is much delayed in PDC-1 and PDC-2, both of which have been rated as resistant. The apparent infection rates in both composites were subsequently small. These consequently, had the lowest AUDPC values. The rates of colonization of individual leaves differed. Likewise, sporulation varied among composites and populations.
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