Melampsora medusae(MELMME)
Distribution details in United States of America
Current pest situation evaluated by EPPO on the basis of information dated
2018: Present, widespread
From CABI Disease map 547 (1991): Present, widespread
From CABI Disease map 547 (1991): Present, widespread
From NPPO: Present, widespread
Widespread, but most important in New England and the Lake States.
EPPO Reporting Service (1993/52) , first outbreaks on poplar hybrids in northwest (Washington).
EPPO Reporting Service (2000/163) : these have since been shown to be caused by a natural hybrid between M. medusae, which is not found as such in the Pacific Northwest, and the local M. occidentalis (which is non-pathogenic to hybrid poplars). This is known as M. x columbiana.
EPPO Reporting Service (2019/049) : found on Populus mexicana subsp. dimorpha in Gainesville.
EPPO Reporting Service (1993/52) , first outbreaks on poplar hybrids in northwest (Washington).
EPPO Reporting Service (2000/163) : these have since been shown to be caused by a natural hybrid between M. medusae, which is not found as such in the Pacific Northwest, and the local M. occidentalis (which is non-pathogenic to hybrid poplars). This is known as M. x columbiana.
EPPO Reporting Service (2019/049) : found on Populus mexicana subsp. dimorpha in Gainesville.
* INTERNET
Widely Prevalent Fungi of the United States. https://www.prevalentfungi.org
* Lloyd AL, Smith JA (2018) First report of poplar leaf rust caused by Melampsora medusae on Populus mexicana in the United States. Plant Disease 102(10), 2031-2033.
------- On Populus mexicana subsp. dimorpha in Gainesville (Florida).
* Newcombe, G.; Stirling, B.; McDonald, S.; Bradshaw jr, H.D. (2000) Melampsora x columbiana, a natural hybrid of M. medusae and M. occidentalis. Mycological Research, 104(3), 261-274.
* Prakash, C. S.; Thielges, B. A. (1989) Canadian Journal of Botany 67 (2), 486-490.
------- 12 isloates from 6 locations across eastern USA were tested for their reaction on 18 Populus genotypes. All isolates were recognised as distinct physiologic races.
* Widin, K. D.; Schipper, A. L., Jr. (1981) Effect of Melampsora medusae leaf rust infection on yield of hybrid poplars in the north-central United States. European Journal of Forest Pathology 11 (7), 438-448.
------- Yield losses in north-central USA were most severe within the natural range of the alternate host Larix.
Widely Prevalent Fungi of the United States. https://www.prevalentfungi.org
* Lloyd AL, Smith JA (2018) First report of poplar leaf rust caused by Melampsora medusae on Populus mexicana in the United States. Plant Disease 102(10), 2031-2033.
------- On Populus mexicana subsp. dimorpha in Gainesville (Florida).
* Newcombe, G.; Stirling, B.; McDonald, S.; Bradshaw jr, H.D. (2000) Melampsora x columbiana, a natural hybrid of M. medusae and M. occidentalis. Mycological Research, 104(3), 261-274.
* Prakash, C. S.; Thielges, B. A. (1989) Canadian Journal of Botany 67 (2), 486-490.
------- 12 isloates from 6 locations across eastern USA were tested for their reaction on 18 Populus genotypes. All isolates were recognised as distinct physiologic races.
* Widin, K. D.; Schipper, A. L., Jr. (1981) Effect of Melampsora medusae leaf rust infection on yield of hybrid poplars in the north-central United States. European Journal of Forest Pathology 11 (7), 438-448.
------- Yield losses in north-central USA were most severe within the natural range of the alternate host Larix.
| Country | State | Status | |
|---|---|---|---|
| Canada | British Columbia | Present, no details | |
| Canada | Newfoundland | Present, no details | |
| Canada | Nova Scotia | Present, no details | |
| Canada | Prince Edward Island | Present, no details | |
| Canada | Québec | Present, no details | |
| Canada | Northwest Territories | Present, no details | |
| Canada | Ontario | Present, no details | |
| Canada | Manitoba | Present, no details | |
| Canada | Present, widespread | ||
| Canada | Saskatchewan | Present, no details | |
| Canada | Alberta | Present, no details | |
| Canada | New Brunswick | Present, no details | |
| Mexico | Present, restricted distribution |