Abies balsamea

*

*

3

3

3

Breeding progr.

A. fraseri

*

*

2

3

3

2

3

Breeding progr.

Acer saccharum

*

*

*

*

2

3

2

2

3

Betula alleghaniensis

*

3

2

3

3

Carya cordiformis

*

3

2

3

2

C. illinoensis

*

3

3

3

Of recent interest to China

C. ovata

*

2

3

2

Castanea dentata

*

*

*

*

2

1

1

1

1

1

International att. needed to ensure continued efforts in developing resistance to Endothia parasitica

Celtis tenuifolia

*

*

2

3

2

3

Fraxinus americana

*

3

F. nigra

*

3

F. quadrangulata

*

*

2

2

2

2

Gymnocladus dioieus

*

*

2

2

2

Juglans cinerea

*

2

2

2

2

Ex situ cons. required in Canada. Affected by Sirococcus clavigignenti juglandacearum

J. nigra

*

*

2

2

Larix laricina

*

*

3

3

3

2

Breeding prog. Canada

Liquidambar styraciflua

*

2

2

2

2

Liriodendron tulipifera

*

3

3

2

Collection and testing in Eastern U.S.

Magnolia acuminata

*

*

2

2

2

Morus rubra

*

In situ conservation required in Canada

Picea glauca

*

3

Breeding progr.

P. mariana

*

Breeding progr.

P. rubens

*

3

2

Platenus occidentalis

*

2

2

2

2

Pinus banksiana

*

Breeding progr.

P. clausa

*

3

3

P. rigida

*

*

3

3

P. echinata

*

2

2

2

Breeding progr. in Eastern U.S.

P. elliottii

*

Breeding progr. in Eastern U.S.

P. palustris

*

3

Breeding progr. in Eastern U.S.

P. resinosa

*

3

Breeding progr.

P. serotina

*

2

2

3

3

3

P. strobus

*

3

Breeding progr.

P. taeda

*

Breeding progr.

P. virginiana

*

2

2

Populus balsamifera

*

2

2

3

2

High potential for biomass on medium fertility soils

P. deltoides

*

2

Breeding progr.

P. tremuloides

*

3

2

3

Breeding progr. in U.S.

Prunus serotina

*

3

3

3

3

Canadian populations at extremes of range

Ptelea trifoliata

*

*

2

2

1

2

Quercus alba

*

*

2

2

3

3

Canadian populations at extremes of range

Q. borealis

*

*

3

3

3

3

Q. macrocarpa

*

*

1

3

3

3

Robinia pseudoacacia

*

*

3

3

Swietenia mahagani

*

1

1

(E)

Taxodium ascendens

*

2

3

3

3

3

T. distichum

*

2

3

3

3

3

Torreya taxifolia

*

2

(E)

Ulmus americana

*

*

3

3

3

2

3

3

Resistance breeding progr.