Troubleshooting
Bosc pear problems — and how to fix them
Bosc pear (Pyrus communis 'Beurré Bosc') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Pear scab (Venturia pirina)
Scabby, cracked lesions on fruit skin, reducing marketability. Particularly problematic in wet springs. Remove fallen leaves, prune for open canopy, and apply copper fungicide at key growth stages if pressure warrants.
Fireblight (Erwinia amylovora)
Beurré Bosc is relatively susceptible to fireblight. Wilted, blackened shoot tips resemble frost damage. Prune well below the infection, sterilise tools with disinfectant between cuts, and avoid excess nitrogen fertiliser.
Poor fruit set
Beurré Bosc is a triploid cultivar and requires two compatible diploid pollinators flowering simultaneously (e.g. 'Conference' and 'Williams'). Without pollinators, crops will be very sparse regardless of good cultural conditions.
Prevent bosc pear problems before they start
Most bosc pear issues are care-mismatch, not bad luck. Dial in the basics:
Bosc pear problems — FAQ
Why is my bosc pear pear scab (venturia pirina)?
Scabby, cracked lesions on fruit skin, reducing marketability. Particularly problematic in wet springs. Remove fallen leaves, prune for open canopy, and apply copper fungicide at key growth stages if pressure warrants.
Why is my bosc pear fireblight (erwinia amylovora)?
Beurré Bosc is relatively susceptible to fireblight. Wilted, blackened shoot tips resemble frost damage. Prune well below the infection, sterilise tools with disinfectant between cuts, and avoid excess nitrogen fertiliser.
Why is my bosc pear poor fruit set?
Beurré Bosc is a triploid cultivar and requires two compatible diploid pollinators flowering simultaneously (e.g. 'Conference' and 'Williams'). Without pollinators, crops will be very sparse regardless of good cultural conditions.