Observations on the Distribution of the Spruce Bud Midge (Rhabdophagaswainei Felt) in Black and White Spruce Crowns and Its Effect on Height Growth

1972 ◽  
Vol 2 (2) ◽  
pp. 69-72 ◽  
Author(s):  
H. F. Cerezke
Keyword(s):  
Tree Height ◽  
White Spruce ◽  
Height Growth ◽  
Lateral Branch ◽  
Height Loss ◽  
Normal Height ◽  
Black And White ◽  
Terminal Buds ◽  
Tree Height Growth

Populations of the spruce bud midge (Rhabdophagaswainei Felt) were sampled on 1 to 6 ft tall black and white spruces (Piceamariana (Mill.) BSP. and P. glauca (Moench) Voss) in central Alberta. The incidence of attacked buds is described in relation to tree height and crown aspect, and in relation to terminal buds of the leader and top whorl branches. Some characteristics of the infested bud are given to assist in its recognition in the field.After leader terminal buds of young white spruce were removed to simulate midge damage, height loss during the same year averaged 25.3%. Normal height growth was resumed in the following year from an apical-dominant lateral branch. The study suggested that, for general surveys, a count of the number of attacked terminal leader buds in young spruce could provide a useful index of midge abundance and provide the basis for estimating its impact on tree height growth.

Provenance Variation in Phenology of Needle Initiation in White Spruce

1973 ◽  
Vol 3 (4) ◽  
pp. 589-593 ◽  
Author(s):  
D. F. W. Pollard
Keyword(s):  
White Spruce ◽  
Height Growth ◽  
Lateral Branch ◽  
Provenance Variation ◽  
Terminal Buds

Rates of needle initiation in lateral branch terminal buds averaged about six primordia per day between mid-May and mid-September in 10 provenances of white spruce. Variation among the provenances was not apparent until late September; a correlation then emerged between accumulated primordia and height growth. The correlation became increasingly strong in October. Slower growing provenances did not increase their primordia after early September.

Genetic resistance to western gall rust in jack pine and its relationship with tree height growth

2015 ◽  
Vol 45 (8) ◽  
pp. 970-977 ◽  
Author(s):  
Y.H. Weng ◽  
P. Lu ◽  
Q.F. Meng ◽  
M. Krasowski
Keyword(s):  
Growth Traits ◽  
Tree Height ◽  
Jack Pine ◽  
Height Growth ◽  
Progeny Testing ◽  
Gene Effects ◽  
Individual Tree ◽  
Improvement Programs ◽  
Heritability Estimates ◽  
Tree Height Growth

Developing resistance to western gall rust (WGR) is important for maintaining healthy and productive jack pine plantations. In this study, we estimated genetic parameters of resistance to WGR and its relationship with tree height growth, based on data collected from three second-generation full-sib progeny testing series of jack pine planted in New Brunswick, Canada. Results indicated that (i) resistance to WGR in jack pine was controlled by both additive and dominance gene effects, with the latter playing a greater role; (ii) narrow-sense heritability estimates for resistance to WGR were low (mean = 0.05; series range = 0.00∼0.09), and broad-sense heritability estimates were moderate on an individual-tree basis (mean = 0.53) and considerably higher on the full-sib family mean basis (mean = 0.87); (iii) additive genetic correlation between tree height growth and WGR incidence was low (≤0.06) in two series and only slightly higher and favorable (–0.19) in one series, suggesting that selection on growth traits would not negatively affect WGR resistance; and (iv) mid-parental additive genetic and dominance effects on WGR were empirically correlated (>0.65), indicating that incorporating breeding for WGR resistance into current jack pine tree improvement programs with a seed orchard approach could partly capture the benefit from dominance effects. Although genetic gains in WGR resistance could be realized through various breeding and deployment schemes, it appeared that rapid improvement could be achieved through backward selection on full-sib family means.

Black and White Spruce Plantings in Minnesota: Container vs Bareroot Stock and Fall vs Spring Planting

1983 ◽  
Vol 59 (4) ◽  
pp. 189-191 ◽  
Author(s):  
A. A. Alm
Keyword(s):  
Picea Mariana ◽  
Picea Glauca ◽  
Black Spruce ◽  
White Spruce ◽  
Height Growth ◽  
Artificial Regeneration ◽  
Black And White ◽  
Four Seasons ◽  
Spring Planting ◽  
Better Than

Black spruce (Picea mariana (Mill.) B.S.P.) and white spruce (Picea glauca (Moench) Voss) styrob-lock and paperpot and 3-0 and 2-2 seedlings were planted spring and fall. After four seasons of growth the container seedlings had survival and height growth as good or better than the nursery seedlings. There were no differences in performance between the two container systems. The 2-2 stock generally had better survival than the 3-0 stock. Survival of fall-planted stock was equal to or better than that of the spring-planted stock. Key words: white spruce, black spruce, styroplugs, paper pots, seedlings, transplants, artificial regeneration, fall vs spring planting

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