The Movement of Dye Solution in Dwarf Mistletoe-infected Black Spruce Trees

1973 ◽  
Vol 3 (2) ◽  
pp. 312-315 ◽  
Author(s):  
F. H. Tainter ◽  
D. W. French
Keyword(s):  
Black Spruce ◽  
Upward Movement ◽  
Acid Fuchsin ◽  
Dwarf Mistletoe ◽  
Counterclockwise Direction

Upward movement of acid fuchsin dye solution in dwarf mistletoe-infected black spruce trees generally occurred in a helical pattern. In seven of ten trees the dye ascended in a counterclockwise direction around the axis of the tree. All trees showed wide variation in direction of ascent, in some cases the dye column reversed direction of ascent partially up the bole. In some instances the witches' brooms apparently attracted the dye.

scholarly journals The Difficulty of Predicting Eastern Spruce Dwarf Mistletoe in Lowland Black Spruce: Model Benchmarking in Northern Minnesota, USA

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 843
Author(s):  
Ella R. Gray ◽  
Matthew B. Russell ◽  
Marcella A. Windmuller-Campione
Keyword(s):  
Stand Structure ◽  
Black Spruce ◽  
Forest Health ◽  
Basal Area ◽  
Predictive Performance ◽  
Stand Age ◽  
Management Decisions ◽  
Dwarf Mistletoe ◽  
Growing Seasons ◽  
Model Interpretation

Insects, fungi, and diseases play an important role in forest stand development and subsequently, forest management decisions and treatments. As these disturbance agents commonly occur within and across landscapes, modeling has often been used to inform forest planning and management decisions. However, models are rarely benchmarked, leaving questions about their utility. Here, we assessed the predictive performance of a Bayesian hierarchical model through on–the-ground sampling to explore what features of stand structure or composition may be important factors related to eastern spruce dwarf mistletoe (Arceuthobium pusillum Peck) presence in lowland black spruce (Picea mariana (Mill.) B. S. P.). Twenty-five state-owned stands included in the predictive model were sampled during the 2019 and 2020 growing seasons. Within each stand, data related to the presence of eastern spruce dwarf mistletoe, stand structure, and species composition were collected. The model accurately predicted eastern spruce dwarf mistletoe occurrence for 13 of the 25 stands. The amount of living and dead black spruce basal area differed significantly based on model prediction and observed infestation, but trees per hectare, total living basal area, diameter at breast height, stand age, and species richness were not significantly different. Our results highlight the benefits of model benchmarking to improve model interpretation as well as to inform our understanding of forest health problems across diverse stand conditions.

scholarly journals Animal vectors of eastern dwarf mistletoe of black spruce.

1983 ◽  
Author(s):  
Michael E. Ostry ◽  
Thomas H. Nicholls ◽  
D.W. French
Keyword(s):  
Black Spruce ◽  
Dwarf Mistletoe

The Incidence of Dwarf Mistletoe in Minnesota Black Spruce Stands Detected by Operational Inventories

2012 ◽  
Vol 29 (3) ◽  
pp. 109-112 ◽  
Author(s):  
Fred Baker ◽  
Mark Hansen ◽  
John D. Shaw ◽  
Manfred Mielke ◽  
Dixon Shelstad
Keyword(s):  
Black Spruce ◽  
Dwarf Mistletoe ◽  
Spruce Stands

Note on the biology of Arceuthobiumpusillum

1979 ◽  
Vol 9 (4) ◽  
pp. 544-545
Author(s):  
Fred A. Baker Jr. ◽  
D. W. French
Keyword(s):  
Black Spruce ◽  
Dwarf Mistletoe ◽  
Secondary Infections

Perennial aerial shoots of Arceuthobiumpusillum Peck with flabellate branching were found in Minnesota. Removal of aerial shoots, presumably by birds, from several dwarf mistletoe plants was also noted. Although rare in other host – dwarf mistletoe combinations, secondary infections are commonly found on black spruce (Piceamariana (Mill.) BSP).

scholarly journals Broadcast burning slash favors black spruce reproduction on organic soil in Minnesota

1971 ◽  
Vol 47 (1) ◽  
pp. 33-35 ◽  
Author(s):  
William F. Johnston
Keyword(s):  
Black Spruce ◽  
Organic Soil ◽  
Sphagnum Moss ◽  
Dwarf Mistletoe ◽  
North Central ◽  
Slash Burning

Slash burning tests showed that summer broadcast burning is superior to both winter progressive burning and no disposal for reproducing black spruce on clearcut areas in north-central Minnesota. Broadcast burning is superior because: 1 it exposes moist sphagnum moss and consumes dry mosses, and thus produces favorable seedbeds over the entire clearcut area; 2 it kills all residual conifers and eradicates dwarf mistletoe; and 3 assuming slash disposal is prescribed, it is much cheaper than progressive burning.

Effective use of ethylene-releasing agents to prevent spread of eastern dwarf mistletoe on black spruce

1985 ◽  
Vol 15 (5) ◽  
pp. 872-876 ◽  
Author(s):  
William H. Livingston ◽  
Robert A. Blanchette ◽  
Mark L. Brenner ◽  
Kathryn J. Zuzek
Keyword(s):  
Carboxylic Acid ◽  
Black Spruce ◽  
Subsequent Growth ◽  
Treatment Combination ◽  
Dwarf Mistletoe ◽  
Effective Use

Ethylene-releasing agents (ethephon, ethanedial dioxime, etacelasil, 2-chloroethyl-methylbis(phenylmethoxy)-silane, and 1-aminocyclopropane-1-carboxylic acid) applied to dwarf mistletoe (Arceuthobiumpusillum Pk.) infections on black spruce (Piceamariana (Mill.) B.S.P.) in four separate tests (August 1982, 1983, and 1984 and May 1983) promoted premature abscission of mistletoe shoots. Concentrations of the chemicals ranged from 12 to 5000 μg/g. Surfactants (Ortho X-77 and PGFI-100) were evaluated for increasing the effectiveness of the ethylene-releasing agents. The treatment combination that consistently resulted in 74–100% abscission of dwarf mistletoe shoots was August applications of 2500 μg/g ethephon plus either surfactant. Treatments did not significantly affect growth of black spruce or subsequent growth of dwarf mistletoe shoots. Abscission of dwarf mistletoe shoots prevents spread of the disease in black spruce for 2 years and for at least 4 years in some western conifers.

Dispersal and survival of seed of eastern dwarf mistletoe

1976 ◽  
Vol 6 (3) ◽  
pp. 335-340 ◽  
Author(s):  
George Hudler ◽  
D. W. French
Keyword(s):  
Seed Dispersal ◽  
Black Spruce ◽  
Substantial Reduction ◽  
The Other ◽  
Horizontal Distance ◽  
Dwarf Mistletoe ◽  
Fruit Abortion ◽  
The Mean ◽  
Freezing Temperatures

Seed dispersal of eastern dwarf mistletoe (Arceuthobiumpusillum) parasitizing black spruce (Piceamariana) in the Fond du Lac State Forest, Carlton Co., Minnesota, U.S.A., began in the 1st week of September and continued until the first frost. Most seeds were discharged during the first 3 h after sunrise. Seed expulsion was a function of rising temperature during that time. The mean horizontal distance travelled by discharged seeds was 1.65 m. One seed travelled 13.7 m. Freezing temperatures on August 31, 1970, caused nearly complete fruit abortion in that year of the study and caused a substantial reduction in seed discharge in the other 2 years. Of 3200 seeds placed on the needles of healthy black spruce in September 1971, only 6.5% of the seeds had germinated by August 1972.

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