Life-table analysis of faba bean rust |
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Authors: | I Sache J C Zadoks |
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Institution: | (1) Department of Phytopathology, Wageningen Agicultural University, P.O. Box 8025, 6700 EE Wageningen, The Netherlands;(2) Present address: Laboratoire de Pathologie Végétale, INRA, 78850 Thiverval-Grignon, France |
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Abstract: | In controlled near-optimum conditions (18 °C), monocyclic sporulation capacity and spore infection efficiency were assessed for faba bean rust on the first and second leaves of field bean. After a latency period of 8–10 days, lesions sporulated duringc. 50 days. Spore production on the second leaf,c. 9×104 spores per lesion, was two times as high as spore production on the first leaf. Infection efficiency was similar for both leaf layers, with a mean value of 0.11 lesion per inoculated spore. Infection efficiency decreased strongly when spores originated from mother lesions older than 20 days. Three life-table statistics (the net reproduction numberR
o
, the mean generation timeT
g
, and the maximum relative growth rater
max
) were calculated.R
o
was larger andT
g
was longer for the second than for the first leaf, butr
max
was nearly the same for both leaf layers (0.31–0.33 day–1).r
max
was compared with the exponential growth rater measured in a field experiment. From the difference between the two rates, the fraction of inoculum lost in field conditions was estimated at 0.54–0.94. The life-table statistics were also compared to those of other legume rusts, and implications of life-table analysis for comparative epidemiology were discussed. |
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Keywords: | comparative epidemiology infection efficiency monocyclic analysis sporulation rate Uromyces viciae-fabae Vicia faba |
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