Pacific Northwest Plant Disease Management Handbook

Pear, Asian Cultivar Susceptibility

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Reviewed: March 2023

Pear, Asian (Pyrus spp.) — Cultivar Susceptibility

Cultivar

Fire Blight1

Pseudomonas2

Scab2

Sunburn2

Maturity3

Fabraea 2 and 4

Chojuro

4.0

I

R

S

M

?

Hosui

3.0

S

R

S

M

I

Kikusui

3.5

I

?

?

M

R

Kosui

S

S

R

R

M

I

Niitaka

4.0

I-R

R

R

L

S-I

Nijisseiki
(20th Century)

3.0

I

S

S

M

R

Seigyoku

3.0

R

?

R

E

I

Seuri

6.5

S

R

R

L

?

Shinko

7.5

S

S

R

L

?

Shinseiki

3.5

S-I

S

S

E

I

Shinsui

I

I-R

?

?

E

R

Tsu Li

I

I

?

?

L

S

Ya Li

7.0

I

?

?

L

S

Bartlett

1.0

?

S

?

?

R

1 USDA Fire Blight Rating (Plant Disease Reporter 54:835-839)

10 = no blight, 1 = dead tree. Beyl, C.A. 1988. Fire blight incidence in Asian pears: 1988 season. Proceedings of the 1988 Southeast Professional Fruit Workers Conference, Athens, GA.

2 R = resistant, I = intermediate, S = susceptible.

Based on observations at Joseph Klein Nursery and the National Clonal Germplasm Repository at Corvallis, OR. At this time it is unknown if this is really scab or some other disease.

3 E = early, M = midseason, L = late

4 Field observations, Pscheidt and Postman, 2015.

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2024 Pacific Northwest Plant Disease Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.

H - Home garden packaging commonly available.     O - Acceptable in organic production.