Is Shinko pear self-fertile or self-sterile?

Shinko Asian Pear is a self sterile cultivar. It is self-sterile and requires 1 compatible diploid pollination partner flowering within Bloom Groups 1–2 to achieve a reliable commercial fruit set.

Can Shinko act as a pollen donor for other pears?

Yes. Shinko Asian Pear is a diploid cultivar (2n chromosomes) producing viable, fertile pollen that readily cross-pollinates other compatible diploid pear varieties flowering across its bloom window.

Which bloom group does Shinko pear belong to?

Shinko Asian Pear flowers in Bloom Group 1 (Early-Spring). It reliably cross-pollinates with compatible cultivars in its own group or immediately adjacent groups (±1 bloom group).

Curated Pomology Guide · Bloom Group 1

Shinko Asian Pear
Pollination & Compatibility Guide

Shinko Asian pear pollination guide: Bloom Group 1 timing, fire blight resistance, companion pollinizers, and commercial crop thinning.

Pomological Verdict & Botanical Profile

Shinko is an Asian Pear (Needs Early Bloom Partner)

Bloom Group 1 · Requires Group 1–2 Partner

Asian pear — blooms 7–14 days earlier than European pear on the same site. Partner with another Asian pear (Nijisseiki, Olympic/Korean Giant) as the primary donor; a European pear is at best supplementary. Shinko (Asian Pear) needs at least one compatible pollinizer from bloom group 0–2 to set a reliable crop.

Chromosome Ploidy: Diploid (2n)
Required Companions: 1 Diploid Partner
Bloom Group: Group 1 (Early-Spring)
Harvest Timing: Mid (+7d from Conference)

Primary Uses:Dessert

Disease Resistance: Resistant to fire blight

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.

Flowering Overlap Range for Shinko

Early Overlap

Group 1

Shinko

Group 1

Late Overlap

Group 2

Any compatible diploid pear flowering within Group 1 to 2 provides matching blossom overlap.

Compatible Pollination Partners (7)

Test in Checker

Cultivar	Bloom Group	Overlap Type	Harvest	Primary Uses	Interactive Test
Olympic (Korean Giant)Guide	Group 1	Full Overlap	Late ±7d delta	Fresh Eating, Storage	Test Cross
Nijisseiki (20th Century)Guide	Group 1	Full Overlap	Mid ±14d delta	Fresh Eating	Test Cross
SeckelGuide	Group 2	Full Overlap	Mid ±14d delta	Fresh Eating, Pickling	Test Cross
PattenGuide	Group 2	Full Overlap	Mid ±21d delta	Fresh Eating, Canning	Test Cross
Golden SpiceGuide	Group 2	Full Overlap	Early ±27d delta	Canning, Jelly	Test Cross
MoonglowGuide	Group 2	Full Overlap	Early ±28d delta	Fresh Eating, Canning	Test Cross
Harrow DelightGuide	Group 2	Full Overlap	Early ±32d delta	Fresh Eating	Test Cross

Incompatible Varieties & Exclusions (1)

These pear varieties overlap in flowering time with Shinko but cannot fertilise it due to non-viable pollen (male-sterile diploids), direct parentage exclusions, or shared incompatibility alleles.

LusciousGuide

Luscious produces no viable pollen, so it cannot serve as a pollinizer.

Pomological Assessment: Blight Resistance, Heavy Bloom & Fruitlet Thinning

Shinko is one of the most reliable and disease-resistant Asian pear cultivars in commercial production. Originating in Japan, it produces medium-to-large round fruit cloaked in an attractive golden-bronze russet skin. The flesh is dense, crisp, and remarkably sweet, with a distinctive butterscotch or caramel undertone.

Flowering occurs early in the spring (Bloom Group 1), aligning with Nijisseiki and Olympic. Shinko produces abundant, viable pollen and serves as a dependable reciprocal donor for other early-blooming Asian pears. The tree sets excessively heavy flower clusters, demanding prompt hand-thinning to one fruitlet per cluster within 30 days of petal fall to maintain commercial fruit size and prevent biennial bearing cycles.

The tree is naturally spreading with medium vigour, producing sturdy lateral spurs that support substantial fruit weight. Russet skin protects fruit from superficial marking during harvest, making it easier to handle and pack than smooth-skinned Asian cultivars. Commercial orchardists find Shinko exceptionally easy to manage due to its low disease susceptibility and dependable annual production of high-quality fruit.

Key Orchard Considerations for Shinko

Rootstock & Graft Compatibility

Performs best on Pyrus betulaefolia or Pyrus calleryana rootstocks in southern and mid-temperate regions, and OHxF 87 in cooler areas. Incompatible with Quince rootstocks.

Fire Blight & Disease Pressure

Demonstrates the highest fire blight resistance among major commercial Asian pear cultivars, making it the preferred choice for humid regions with severe blight pressure. Moderate resistance to Alternaria black spot.

Harvest Window & Post-Harvest Handling

Picks late mid-season, approximately two to three weeks after Nijisseiki. Russet skin protects fruit from superficial marking during harvest. Stores exceptionally well, holding firmness for up to 4 months at 0°C.