Entomosporium leaf spot （ELS） is caused by the fungus Fabraea maculata （anamorph： Entomosporium mespili） and affects most pear cultivars and quince rootstocks in Brazil. The aim of this study was to characterize ...Entomosporium leaf spot （ELS） is caused by the fungus Fabraea maculata （anamorph： Entomosporium mespili） and affects most pear cultivars and quince rootstocks in Brazil. The aim of this study was to characterize the effect of Adams, EMA and EMC quince rootstocks on ELS in European pear cultivar ＂Abate Fetel＂ in Southern Brazil, during the 2009/2010, 2010/2011 and 2011/2012 growing season. The incidence and severity of disease was quantified weekly in 100 randomly leaves distributed in four medium-height branches per plant with eight replications. Disease progress curves of ELS were constructed and the epidemics compared according to： （1） the beginning of symptoms appearance （BSA）; （2） the time to reach the maximum disease incidence and severity （TRMDI and TRMDS）; （3） area under the incidence and severity disease progress curve （AUIDPC and AUSDPC）. The data were analyzed by linear regression and adjusted for three empirical models： Logistic, Monomolecular and Gompertz. The Abate Fetel cultivar under all rootstocks evaluated was susceptible to E. mespili. However, there were significant differences in ELS intensity among rootstocks evaluated. The highest ELS intensities were observed in combinations with EMA and Adams quince rootstock. Abate Fetel cultivar grafted on EMC quince rootstock showed all epidemiological variables results significantly different when compared with EMA quince rootstock. EMC quince rootstock induced late resistance compared with the other considerated rootstocks. The Logistic model was the most appropriates to describe the ELS progress of Abate Fetel cultivar under all rootstocks evaluated in the edafoclimatic conditions of Southern Brazil, during the 2009/2010, 2010/2011 and 2011/2012 growing season.展开更多
文摘Entomosporium leaf spot （ELS） is caused by the fungus Fabraea maculata （anamorph： Entomosporium mespili） and affects most pear cultivars and quince rootstocks in Brazil. The aim of this study was to characterize the effect of Adams, EMA and EMC quince rootstocks on ELS in European pear cultivar ＂Abate Fetel＂ in Southern Brazil, during the 2009/2010, 2010/2011 and 2011/2012 growing season. The incidence and severity of disease was quantified weekly in 100 randomly leaves distributed in four medium-height branches per plant with eight replications. Disease progress curves of ELS were constructed and the epidemics compared according to： （1） the beginning of symptoms appearance （BSA）; （2） the time to reach the maximum disease incidence and severity （TRMDI and TRMDS）; （3） area under the incidence and severity disease progress curve （AUIDPC and AUSDPC）. The data were analyzed by linear regression and adjusted for three empirical models： Logistic, Monomolecular and Gompertz. The Abate Fetel cultivar under all rootstocks evaluated was susceptible to E. mespili. However, there were significant differences in ELS intensity among rootstocks evaluated. The highest ELS intensities were observed in combinations with EMA and Adams quince rootstock. Abate Fetel cultivar grafted on EMC quince rootstock showed all epidemiological variables results significantly different when compared with EMA quince rootstock. EMC quince rootstock induced late resistance compared with the other considerated rootstocks. The Logistic model was the most appropriates to describe the ELS progress of Abate Fetel cultivar under all rootstocks evaluated in the edafoclimatic conditions of Southern Brazil, during the 2009/2010, 2010/2011 and 2011/2012 growing season.
