Quantitative analysis of two important epidemiological features of the common bean: Phaeoisariopsis griseola pathosystem


Autoria(s): Willocquet,Laetitia; Allorent,Delphine; Savary,Serge
Data(s)

01/12/2004

Resumo

This work quantifies two important epidemiological features of the bean (Phaseolus vulgaris)/Phaeoisariopsis griseola pathosystem. The first is the effect of the number of nights of leaf wetness on infection efficiency. Infection efficiency was below 10% when inoculated leaflets were exposed to less than two nights of leaf wetness. Optimum infection efficiencies were obtained after three to four nights of leaf wetness, at about 50%. Further nights of leaf wetness did not increase the infection efficiency. The second feature quantified is the relative rate of leaflet defoliation for varying levels of angular leaf spot severity. It increased with disease severity according to a logarithm-like curve, and a relative rate of 0.23 day-1 was estimated for a severity of 18%. The implications of these results on the disease epidemiology are discussed.

Formato

text/html

Identificador

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000600015

Idioma(s)

en

Publicador

Sociedade Brasileira de Fitopatologia

Fonte

Fitopatologia Brasileira v.29 n.6 2004

Palavras-Chave #epidemiology #angular leaf spot #Phaseolus vulgaris #infection efficiency #defoliation #leaf wetness #monocycle process
Tipo

journal article