ISSN:
1573-8469
Schlagwort(e):
comparative epidemiology
;
infection efficiency
;
monocyclic analysis
;
sporulation rate
;
Uromyces viciae-fabae
;
Vicia faba
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01874857
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