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First Report of Phoradendron macrophyllum on Populus tremuloides
1Department of Plant Pathology, University of Arizona, Tucson 85721.
Plant Disease
|March 3, 2019
Summary
This study reports the first known instance of Phoradendron macrophyllum mistletoe infecting aspen trees (Populus tremuloides). The identification was confirmed through microscopic analysis of leaf trichomes, expanding the known host range for this common mistletoe species.
Area of Science:
- Botany
- Plant Pathology
- Ecology
Background:
- Phoradendron macrophyllum is a widespread mistletoe species found on numerous hardwood trees, primarily in arid and semi-arid regions of the southwestern United States and Mexico.
- Its known host range includes various Populus species, but infection on aspen (Populus tremuloides) has not been previously documented.
- Mistletoe infections can impact host tree health and survival, making host range studies crucial for forest management.
Purpose of the Study:
- To document and confirm the first occurrence of Phoradendron macrophyllum parasitizing an aspen tree (Populus tremuloides).
- To identify the mistletoe species based on morphological characteristics, specifically leaf trichomes.
- To expand the understanding of the host-parasite interactions involving Phoradendron macrophyllum.
Main Methods:
- Field observation and collection of a mistletoe specimen from an infected aspen tree.
- Microscopic examination of leaf trichomes of the collected specimen.
- Comparison of observed trichome morphology with established descriptions for Phoradendron macrophyllum and P. coryae.
Main Results:
- A specimen identified as Phoradendron macrophyllum was found parasitizing a planted aspen (Populus tremuloides) in Graham County, Arizona.
- Microscopic analysis confirmed the mistletoe's identity by comparing its leaf trichomes to known characteristics of P. macrophyllum (bifurcate trichomes) and P. coryae (stellate trichomes).
- The infected aspen exhibited a large branch swelling with small mistletoe plants measuring less than 5 cm in height.
Conclusions:
- This represents the first documented report of Phoradendron macrophyllum, or any mistletoe species, infecting aspen (Populus tremuloides).
- The findings expand the known host range of Phoradendron macrophyllum, highlighting its adaptability to new host species.
- Further research may be warranted to assess the potential impact and spread of Phoradendron macrophyllum on aspen populations.
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