Seasonal Dynamics of Conidial Production Potential of Fusicladium carpophilum on Twig Lesions in Southeastern Peach Orchards

Plant Disease
H SchermW G Foshee

Abstract

Conidia produced on overwintered lesions on 1-year-old twigs constitute the only source of primary inoculum for the peach scab fungus, Fusicladium carpophilum; however, there is little quantitative information about the dynamics of sporulation throughout the season. Starting in late winter and continuing until midsummer over a 4-year period, twig segments were sampled every 1 to 2 weeks from peach trees untreated with fungicide from a total of 18 trials (site-cultivar-year combinations) in Georgia, Alabama, and South Carolina. Twig samples were incubated in a moist chamber in the laboratory for 48 h and washed on a wrist-action shaker, and conidial production potential was determined by microscopic counts in aliquots of the wash water. When plotted against calendar date (day of the year), there was considerable variation among cultivars, sites, and years in the temporal pattern of conidial numbers of F. carpophilum. For example, conidia first were detected on samples collected between mid-February and late March, and the highest peak in conidial numbers was observed between late March and mid-May. In contrast, when conidial numbers were expressed as cumulative totals in relation to phenological time (either days after full bloo...Continue Reading

Citations

Feb 28, 2020·Plant Disease·Norman LalancettePeninah Engel
Oct 5, 2017·Frontiers in Plant Science·Elisa González-DomínguezVittorio Rossi
May 1, 2013·Plant Disease·Clive H BockBruce W Wood
Mar 4, 2021·Molecular Plant-microbe Interactions : MPMI·Yang ZhouChao-Xi Luo
Oct 16, 2021·Molecular Plant-microbe Interactions : MPMI

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