Volume 53 Number 2 Article 17
Year 1999 Month 4
Title: Resistance of Pear Cultivars in Oregon to Natural Fire Blight Infection
Authors: R.A. Spotts and E.A. Mielke
Abstract:
In April 1994, severe fire blight infection occurred in a planting of 119 pear cultivar/rootstock combinations.
Infection varied from 0 to 59 strikes per tree.
Of four replicate trees of each cultivar/rootstock combination, 34, 34, 34, 15, and 2 combinations had infection in 0, 1, 2, 3, and 4 trees, respectively. 'Jules d'Airolles' and 'Worden Seekel' on OH × F 333 had fire blight strikes in all trees, with
an average of 6.7 and 5.0 strikes per tree, respectively.
Over 80% of all fire blight strikes were visible
by 9 May.
Most of the highly infected cultivars were at full bloom between 16 and 20 April, the time
that coincided with extreme risk weather conditions.
While some of the noninfected cultivars were well
past full bloom when risk was high and may have escaped infection, others were in full bloom and may
possess genetic resistance.
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