Foliar rust resistance in low-chill peaches

Robert E. Rouse

Abstract


Foliar rust [Tranzschelia discolor (Fuckel) Tranzschel & Litvinov] is a major problem in stonefruit when grown throughout humid subtropical climates. Resistance in plums was observed early in the University of Florida breeding program and recent cultivar releases in Florida show few symptoms. Potential resistance in peach germplasm was observed in 1997, and gave impetus to more careful screening of genotypes the past two seasons. This is the first report of resistance in peach. We have identified 12 resistant of 193 genotypes (three cultivars and nine advanced selections) that have an apparent reduced amount of rust and delayed expression in symptoms of leaf infection and abscission. We believe resistance is more than tolerance and appears to have a genetic basis in that most of the genotypes expressing resistance have a common ancestor within the last three generations. Because most of the parents are highly susceptible, the mode of resistance is likely to be recessive.

Keywords


leaf abscission; defoliation; autumn bloom; prunus; tranzschelia discolor

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283