Components of rate-reducing resistance to Cercospora leaf spot in sugar beet
1997
Rossi, V. | Battilani, P. | Chiusa, G. | Giosue, S. | Languasco, L. | Racca, P. (Universita Cattolica Sacro Cuore, Piacenza (Italy). Istituto di Entomologia e Patologia vegetale)
Studies on the components of rate-reducing resistance in sugarbeet were made in controlled-environment monocyclic experiments using cultivars with different known levels of resistance to Cercospora beticola ("Univers" and "Cyrano", "Bushel", "Monodoro", "Break"). The infection efficiency of conidia (number of conidia causing infection per square cm of leaf), spore production (number of conidia yielded per square cm of necrotic area), and lesion size (square cm of necrotic area per spot) were reduced in the resistant cultivars compared to the susceptible one; incubation (thermal time required to infect leaves till the appearance of necrotic spots) was longer in the resistant cultivars, whereas the growth rate of necrotic spots (increase of the necrotic area per unit of thermal time) and the length of conidiation period (thermal time from the appearance of necrotic spots to sporulation) were not significantly influenced by cultivar. The differences between cultivars in the resistance components were in agreement with the rating of their resistance at the field level.
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