scholarly journals Upward advance, intensification, and spread of Dwarf Mistletoe in a thinned stand of Western Larch /

1991 ◽  
Author(s):  
Ed F. Wicker ◽  
Frank G. Hawksworth ◽  
Keyword(s):  
Dwarf Mistletoe ◽  
Western Larch

Effects of Thinning on Volume Growth of Western Larch Infected with Dwarf Mistletoe in Northeastern Oregon

1989 ◽  
Vol 4 (4) ◽  
pp. 143-145
Author(s):  
Gregory M. Filip ◽  
J. J. Colbert ◽  
Catherine A. Parks ◽  
Kenneth W. Seidel
Keyword(s):  
Electrical Resistance ◽  
Volume Growth ◽  
Larix Occidentalis ◽  
Dwarf Mistletoe ◽  
Western Larch ◽  
Snow And Ice

Abstract Cubic volume growth and tree vigor of 70-year-old western larch (Larix occidentalis) with and without dwarf mistletoe (Arceuthobium laricis) were measured 15 years after thinning from above or below to residual densities of 50 to 170 ft²/ac. Vigor was assessed by cambial electrical resistance (CER). Proportional volume growth increased after thinning; was significantly related to the interaction of thinning method and residual density; and decreased with increased dwarf mistletoe severity. Thinning from above was associated with significantly higher proportional volume growth, but led to increased mortality from snow and ice damage to infected trees. CER was significantly related to severity of infection but not to treatment. Thinning is recommended in dwarf mistletoe infested stands of western larch to increase volume growth and reduce new infections in residual trees. West. J. Appl. For. 4(4):143-145, October 1989.

HEMLOCK AND LARCH DWARF MISTLETOE SEED DISPERSAL

1966 ◽  
Vol 42 (4) ◽  
pp. 395-401 ◽  
Author(s):  
Richard B. Smith
Keyword(s):  
Seed Dispersal ◽  
Western Hemlock ◽  
Dwarf Mistletoe ◽  
Western Larch ◽  
Potential Sources ◽  
Tree Seeds ◽  
Larch Tree

During 1964-65, approximately 49,050 hemlock dwarf mistletoe seeds were dispersed from a severely infected 35-ft. western hemlock tree, and 3,750 larch mistletoe seeds were dispersed from a lightly infected 63-ft. western larch tree. Seeds were trapped over an area 5,800 ft.2 in extent around the hemlock, and over an area of 2,200 ft.2 around the larch.The peak of larch mistletoe seed dissemination was about 1 month earlier than for hemlock. Seed counts for both years and both mistletoes were highest in the southwest and least in the northeast quadrants of the trapping areas.It was firmly established that small trees, even if lightly infected, are a serious potential sources of dwarf mistletoe seed; they must be removed if satisfactory dwarf mistletoe control is to be achieved.

EcologyDevelopment of Dwarf Mistletoe (Arceuthobium) Infections on Western Hemlock, Shore Pine, and Western Larch

1971 ◽  
Vol 1 (1) ◽  
pp. 35-42 ◽  
Author(s):  
R. B. Smith
Keyword(s):  
Seed Dispersal ◽  
Life Span ◽  
Western Hemlock ◽  
First Year ◽  
Mature Fruit ◽  
Dwarf Mistletoe ◽  
Western Larch ◽  
The Third ◽  
Second Year ◽  
Shore Pine

Newly dispersed seeds, established infections, and individually tagged shoots of hemlock dwarf mistletoe on western hemlock and shore pine, and established infections and individual shoots of larch mistletoe on western larch were examined periodically for up to 7 years, Infections on hemlock first appeared as swellings, some of which were visible during the first year after seed dispersal. Aerial shoots appeared in the second year. By the end of the third year most infections exhibited both swellings and aerial shoots. On all three hosts, mature mistletoe fruit were produced occasionally in the fourth year but generally not until the fifth year. Most female aerial shoots bore at least one crop of flowers during their existence, however, only half produced mature fruit. Aerial shoots varied in their life span from less than 1 year up to 7 years. The average was 2 to 3 years. One female shoot on larch bore five successive crops of flowers. The fastest longitudinal growth of mistletoe endophytic system occurred on western larch and the slowest was on shore pine. All infections were nonsystemic in that the endophytic system was largely confined to the swollen portions of the hosts.

scholarly journals Effects of Thinning and Overstory Removal on Western Larch and Western Larch Dwarf Mistletoe

2016 ◽  
Vol 62 (2) ◽  
pp. 190-199
Author(s):  
Marcus B. Jackson ◽  
Christopher J. Hayes ◽  
Jane E. Taylor ◽  
Brennan A. Ferguson
Keyword(s):  
Dwarf Mistletoe ◽  
Western Larch

scholarly journals Infection of Young Western Larch by Larch Dwarf Mistletoe in Northern Idaho and Western Montana

1998 ◽  
Vol 13 (2) ◽  
pp. 41-46
Author(s):  
Robert L. Mathiasen
Keyword(s):  
Infection Intensity ◽  
Western Montana ◽  
Larix Occidentalis ◽  
Dwarf Mistletoe ◽  
Western Larch ◽  
Northern Idaho

Abstract Six-hundred dwarf mistletoe-infected western larch (Larix occidentalis) ranging in age from 10-20 yr were sampled to determine the approximate age and height at which they were initially infected by larch dwarf mistletoe (Arceuthobium laricis). The age of each observable mistletoe infection was determined for each sapling, and the age and height of the trees when they were initially infected were estimated based on the age of the oldest mistletoe infection. Few of the young larch sampled were infected before they reached 7 yr old or 1.5 m in height. Most of the young larch, however, were infected before they were 14 yr old or 4 m in height. Initial age and height of infection were significantly influenced by the infection intensity of the overstory larch growing within 12 m of the infected saplings. Because parasitism by larch dwarf mistletoe can be extremely damaging to western larch, infected overstory larch should be removed or killed before nearby larch regeneration reaches 7 yr old or 1 m in height when minimizing infection of the regeneration is a management objective. West. J. Appl. For. 13(2):41-46.

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