Survival of Apple Rootstocks to Natural Infections of Fire Blight

in HortTechnology
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  • 1 Department of Horticulture and Crop Science, Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691.
  • | 2 Department of Computing and Statistical Services., Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691.

Survival of replicated rootstock plantings of apple trees (Malus ×domestica) to fire blight (Erwinia amylovora) infection shows that a wide range of rootstock susceptibility exists. Trees on `Malling 26' (M.26), `Malling 9' (M.9), and `Mark' consistently had significant losses. Of the dwarfing rootstocks widely available commercially, `Budagovsky 9' (B.9) survived well with productive trees, but was not resistant to fire blight infection. The following experimental rootstocks had good survivability with many live productive trees in one or more trials: `Poland 2' (P.2), `Vineland 1' (V.1), `Malling 27 EMLA' (M.27 EMLA), `Budagovsky 491' (B.491), `Budagovsky 409' (B.409), `Vineland 7' (V.7), `Vineland 4' (V.4), and `Oregon Rootstock 1' (OAR1).

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