Volume 59 Number 2 Article 11
Year 2005 Month 4
Title: Comparative Relative Susceptibility of NE-183 Apple Cultivars to Fruit Rot Pathogens in West Virginia
Authors: A.R. Biggs and S.S. Miller
Abstract:
Twenty-three apple (Malus × domestica Borkh.) cultivars were tested over a 5-year period with controlled
inoculations in the field and laboratory for their relative susceptibility to the pathogens that cause common
preharvest ("summer") fruit rot diseases in the mid-Atlantic region of the United States.
Pathogens tested were
isolates of Colletotrichum acutatum, Botryosphaeria dothidea, and B. obtusa, the causal agents for bitter rot,
white rot, and black rot respectively.
Wounded (for Botryosphaeria spp.) or nonwounded (for C. acutatum) fruit
were inoculated in the field and laboratory at 2 to 3 weeks preharvest with mycelium (for Botryosphaeria spp.)
or conidia (for C. acutatum) from axenic cultures.
Fruit were rated for relative susceptibility to the different
fungi by determining disease severity of attached fruit in the field based on lesion growth and detached fruit in
laboratory inoculations of wounded fruit.
Based on the laboratory and field data from 5 growing seasons, cultivars
were classified into three relative susceptibility groups: most susceptible: 'Pristine', 'Fortune', 'Sunrise', 'Orin',
and 'Arlet'; moderately susceptible: 'Sansa', 'Ginger Gold', 'Golden Supreme', 'Honeycrisp', 'PioneerMac',
'Suncrisp', 'Cameo', 'Senshu', 'Shizuka', 'Yataka', and NY75414; and least susceptible: 'Enterprise', 'Golden
Delicious', 'Creston', 'GoldRush', 'Gala Supreme', 'Braeburn', and 'Fuji'. Results of the present study indicate
that new apple cultivars from the first NE-183 planting vary in their resistance to the different rot fungi and none,
perhaps with the exceptions of 'Gala Supreme' and 'Fuji,' shows uniform resistance to the spectrum of summer
rot pathogens included in these experiments.
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