The really fireblight resistant pears are a short list

General Fruit Growing
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this slide is from 2013 I think and is not complete and there are more

Magness is pollen sterile

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Kieffer, Beurre Hardy, Bell (new pear), Ambrosia, Ayers, Mericourt, Green Jade (from Purdue) also have FB resistance and can pollinate

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Pears in Zone 4 with Fire Blight resistance