Have you heard of the 65/65 rule? If not it means 65° F and 65% humidity = perfect fireblight conditions. Recall experts know fireblight only attacks actively growing pear trees. Make sure to not prune during times when the pear is growing. If i must prune i quickly cover the wound with indoor paint or tanglefoot during fb season. Some people spray the tree with streptomyacin during those 65/65 conditions if the tree is particularly susceptible. Below is a partial list of Fireblight resistant varieties from the website http://www.ars-grin.gov/cor/catalogs/pyrblres.html. Even with the extremely resistant varieties my recommendation would be to do most of your pruning in the dormant season before FB becomes active. That also means graft a little earlier. I wanted to post an easier to read partial list as the information can be very difficult to obtain.
PI 541179 Duchesse Bronzee - COR - Pyrus communis
PI 541188 Farmingdale - COR - Pyrus communis
PI 541217 Lincoln - COR - Pyrus communis
PI 541231 Maxine - COR - Pyrus communis
PI 541306 Dabney - COR - Pyrus communis
PI 541336 Duchesse d’Angouleme Bronzee
PI 657922 Blake’s Pride
PI 541160 Cayuga - COR - Pyrus hybr.
PI 541311 Hood - COR - Pyrus hybr.
PI 541707 Cincincis- COR - Pyrus hybr.
PI 541708 Dixie- COR - Pyrus hybr.
PI 541709 Estella- COR - Pyrus hybr.
PI 541711 Garber- COR - Pyrus hybr.
PI 541712 Good Christian- COR - Pyrus hybr.
PI 541715 Richard Peters- COR - Pyrus hybr.
PI 541727 Sodak- COR - Pyrus hybr.
PI 541903 Monterrey- COR - Pyrus hybr.
PI 541954 Orient- COR - Pyrus hybr.
PI 617548 Spalding- COR - Pyrus hybr.
PI 617561 Pineapple- COR - Pyrus hybr.
PI 541208 Hoskins Pyrus communis
PI 541259 Saint Andre Pyrus communis
PI 541264 Snyder Pyrus communis
PI 541269 Sucre Verte Pyrus communis
PI 541280 Warner Pyrus communis
PI 541299 Magness Pyrus communis
PI 541315 Moonglow Pyrus communis
PI 541320 Honeysweet Pyrus communis
PI 541322 Luscious Pyrus communis
PI 541343 Mac Pyrus communis
PI 541345 Mericourt Pyrus communis
PI 541347 Moe Pyrus communis
PI 541350 Southworth Pyrus communis
PI 541388 El Dorado Pyrus communis
PI 541431 Harrow Delight Pyrus communis
PI 541448 Warren Pyrus communis
PI 541506 Tyson Pyrus communis
PI 617549 Morgan Pyrus communis
PI 617573 Carrick Pyrus communis
PI 617594 Potomac Pyrus communis
PI 541710 Eureka Pyrus hybr.
PI 617601 Tenn Pyrus hybr.
PI 541908 Okolo Pyrus pyrifolia
PI 654919 Singo Pyrus pyrifolia
PI 541998 Pai Li Pyrus ussuriensis
PI 541120 Ayer Pyrus communis
PI 541183 Early Harvest Pyrus communis
PI 541280 Warner Pyrus communis
PI 541431 Harrow Delight Pyrus communis
PI 541442 Atlantic Queen Pyrus communis
PI 541547 Golden Spice Pyrus communis
PI 617554 Bantam Pyrus communis
PI 541714 Kieffer Pyrus hybr.
PI 541722 Ayers Pyrus hybr.
PI 541723 Douglas Pyrus hybr.
PI 617642 Turnball Giant Pyrus hybr.
PI 641280 Ledbetter Pear Pyrus sp
PI 541303 Duchesse d’Angouleme Pyrus communis
I strongly suspect clara frijs is fire blight resistant because I have grown it in a highly susceptible spot with no signs of fire blight. I’m still testing my theory and wont know until it bears fruit for sure. By the way this link has some ripening times for some of these FB resistant pears that may be useful Website Disabled
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