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First Report of Golden Dwarf Mistletoe on Pinus maximinoi
R Mathiasen1, S Sesnie1, J Calderon2
1School of Forestry, Box 15018, Northern Arizona University, Flagstaff 86011.
Plant Disease
|March 8, 2019
Summary
Golden dwarf mistletoe (Arceuthobium aureum subsp. aureum) is newly reported infecting Pinus maximinoi in Guatemala. Severely infected older Pinus maximinoi trees developed witches
Area of Science:
- Plant Pathology
- Forest Botany
- Entomology
Background:
- Golden dwarf mistletoe (Arceuthobium aureum subsp. aureum) is endemic to Guatemala.
- Its known hosts include Pinus pseudostrobus, P. montezumae, and P. oaxacana.
- Previous literature indicated it does not cause witches'-brooms on hosts.
Purpose of the Study:
- To report the first occurrence of golden dwarf mistletoe on Pinus maximinoi.
- To document the formation of witches'-brooms on infected Pinus maximinoi.
- To assess the susceptibility of Pinus oocarpa to this mistletoe.
Main Methods:
- Field surveys were conducted in Alta Verapaz and Baja Verapaz, Guatemala.
- Observations were made on infected Pinus maximinoi and nearby Pinus oocarpa.
- Tree age and infection severity were noted in relation to witches'-broom formation.
Main Results:
- Golden dwarf mistletoe was found infecting Pinus maximinoi at four new locations.
- Older, severely infected Pinus maximinoi exhibited witches'-broom development.
- Pinus oocarpa trees growing near infected Pinus maximinoi showed no signs of infection.
Conclusions:
- Pinus maximinoi is a new host for golden dwarf mistletoe.
- The mistletoe can induce witches'-brooms on older, severely infected Pinus maximinoi.
- Pinus oocarpa appears resistant to golden dwarf mistletoe infection in this region.
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