Bosc (Beurré Bosc) Pear
Pollination & Compatibility Guide
Bosc pear pollination guide: Bloom Group 3 overlap, diploid compatibility, Quince graft incompatibility, and cinnamon russet storage management.
Bosc is Self-Sterile (Needs 1 Diploid Partner)
Bosc (Beurré Bosc) needs at least one compatible pollinizer from bloom group 2–4 to set a reliable crop.
- Chromosome Ploidy
- Diploid (2n)
- Required Companions
- 1 Diploid Partner
- Bloom Group
- Group 3 (Mid-Spring)
- Harvest Timing
- Late (+14d from Conference)
Flowering Period & Overlap Window
Pear flowering periods are compressed into numbered bloom groups (1 through 4). Cross-pollination requires overlapping blossom timing between genetically compatible cultivars, with Asian pears flowering 7–14 days ahead of mid-season European varieties.
Any compatible diploid pear flowering within Group 2 to 4 provides matching blossom overlap.
Compatible Pollination Partners (22)
| Cultivar | Bloom Group | Overlap Type | Harvest | Primary Uses | Interactive Test |
|---|---|---|---|---|---|
| Group 3 | Full Overlap | Late Concurrent (±0d) | Fresh Eating | Test Cross | |
| Group 3 | Full Overlap | Mid Concurrent (±0d) | Fresh Eating, Storage | Test Cross | |
| Group 3 | Full Overlap | Late Concurrent (±0d) | Fresh Eating | Test Cross | |
| Group 3 | Full Overlap | Late ±7d delta | Fresh Eating, Canning | Test Cross | |
| Group 3 | Full Overlap | Mid ±14d delta | Fresh Eating, Cooking | Test Cross | |
| Group 3 | Full Overlap | Late ±14d delta | Fresh Eating, Cooking | Test Cross | |
| Group 3 | Full Overlap | Late ±21d delta | Fresh Eating, Canning | Test Cross | |
| Group 3 | Full Overlap | Mid ±21d delta | Fresh Eating, Canning | Test Cross | |
| Group 3 | Full Overlap | Mid ±28d delta | Fresh Eating, Canning | Test Cross | |
| Group 3 | Full Overlap | Early ±28d delta | Fresh Eating, Canning | Test Cross | |
| Group 3 | Full Overlap | Early ±39d delta | Fresh Eating | Test Cross | |
| Group 3 | Full Overlap | Mid ±42d delta | Fresh Eating | Test Cross | |
| Group 4 | Full Overlap | Late Concurrent (±0d) | Fresh Eating, Cooking | Test Cross | |
| Group 4 | Full Overlap | Late Concurrent (±0d) | Fresh Eating | Test Cross | |
| Group 4 | Full Overlap | Late Concurrent (±0d) | Canning, Cooking | Test Cross |
Incompatible Varieties & Exclusions (4)
These pear varieties overlap in flowering time with Bosc but cannot fertilise it due to non-viable pollen (male-sterile diploids), direct parentage exclusions, or shared incompatibility alleles.
Gourmet produces no viable pollen, so it cannot serve as a pollinizer.
Luscious produces no viable pollen, so it cannot serve as a pollinizer.
Magness produces no viable pollen, so it cannot serve as a pollinizer.
Warren produces no viable pollen, so it cannot serve as a pollinizer.
Pomological Assessment: Pyriform Symmetry, Incompatibility & Russet Development
Originating in Belgium or France in the early 19th century, Beurré Bosc is instantly recognizable by its long, gracefully tapering neck and complete coating of warm cinnamon russet. Unlike melting dessert pears, Bosc features dense, crisp-tender flesh that holds its structural integrity exceptionally well during poaching, baking, and culinary processing.
Bosc is a diploid cultivar that requires cross-pollination from a compatible diploid partner flowering in Bloom Group 3. Bartlett, Anjou, Conference, and Harrow Sweet all provide overlapping bloom windows and viable pollen. Bosc produces copious pollen and serves as a reliable reciprocal pollinizer for other mid-season cultivars.
In the orchard, Bosc trees are notoriously vigorous, upright, and straggly in their early years. Establishing wide branch angles through limb spreaders or trellis training is essential to prevent narrow, weak crotches. Fruit develops uniformly along spurs and terminals, creating dense clusters that require hand-thinning to achieve premium grade size. Because mature Bosc trees produce fruit on long, weeping branches, selective heading-back cuts help stiffen fruiting laterals and maintain fruit clearance above ground level.
Key Orchard Considerations for Bosc
Bosc is incompatible with Quince rootstocks (Quince A and Quince C); direct grafts develop necrotic tissue at the graft line and fail prematurely. Plantings should be established on OHxF 87 or OHxF 97 rootstocks, or top-worked on a Beurré Hardy interstem.
Bosc is moderately to highly susceptible to fire blight. Its vigorous young shoots and tender blossom spurs require careful monitoring, and nitrogen inputs should be balanced to prevent excessive, succulent vegetative flushes.
Picks mid-to-late season when skin under-russet changes from green to yellowish-bronze and firmness measures 6.0–7.0 kg/cm² (13–15 lbs). Cold storage conditioning for 2–4 weeks improves sweetness and ensures uniform ripening.
Take Bosc from Planning to Planting
Use Kropigo's free browser tools to model your block density, tree counts, and pollinizer rows, then maintain permanent orchard records row by row.
Pollination Checker
Check Bosc against supported cultivars with compatible flowering and pollination data.
Commercial Block Planner
Calculate high-density tree spacing, row geometry, and establishment costs.
Block Record Keeping
Track pruning, chemical thinning, and harvest tallies block by block from the orchard.