Studies on the factors affecting the population levels of Adelges cooleyi (Gillette) on Douglas fir

2009 ◽  
Vol 90 (1-5) ◽  
pp. 133-141 ◽  
Author(s):  
W. H. Parry
Keyword(s):  
Douglas Fir ◽  
Factors Affecting ◽  
Adelges Cooleyi

FACTORS AFFECTING THE VIABILITY AND GERMINATION BEHAVIOR OF CONIFEROUS SEED. IV. STRATIFICATION PERIOD AND INCUBATION TEMPERATURE, PSEUDOTSUGA MENZESII (MIRB.) FRANCO

1960 ◽  
Vol 36 (1) ◽  
pp. 18-29 ◽  
Author(s):  
G. S. Allen
Keyword(s):  
Incubation Temperature ◽  
Douglas Fir ◽  
Factors Affecting ◽  
Cold Spring ◽  
Geographic Sources

Douglas fir seed from 10 geographic sources was stratified for periods of up to 150 days in length and incubated at 10, 15, 20, 25, and 30 °C. The relatively rapid germination at 10 °C following the longer periods of stratification indicates advantages for nurseries subject to cold spring weather. The observed decrease of germination per cent (and apparent germinative capacity) after long periods of stratification of some lots suggests that long stratification may be used as a test of vigor or durability. Separation of Coastal seed lots from Interior seed lots, and further separation of these into broad classes appears possible on the basis of germination behavior at 10 °C or 15 °C following a specific period of stratification such as 20 or 40 days.

Insecticidal Control of Adelges cooleyi on Douglas-Fir in Ohio, with Notes on Biology12

1972 ◽  
Vol 65 (3) ◽  
pp. 912-914 ◽  
Author(s):  
R. L. Campbell ◽  
C. P. Balderston
Keyword(s):  
Douglas Fir ◽  
Adelges Cooleyi

Factors affecting the canopy resistance of a Douglas-fir forest

1976 ◽  
Vol 10 (4) ◽  
pp. 475-488 ◽  
Author(s):  
C. S. Tan ◽  
T. A. Black
Keyword(s):  
Douglas Fir ◽  
Canopy Resistance ◽  
Factors Affecting

scholarly journals Douglas Fir Seed Sources Tested for Christmas Trees in Connecticut

1984 ◽  
Vol 2 (3) ◽  
pp. 93-97
Author(s):  
R.A. Jaynes ◽  
G.R. Stephens ◽  
J.F. Ahrens
Keyword(s):  
New Mexico ◽  
Pseudotsuga Menziesii ◽  
Rocky Mountain ◽  
Douglas Fir ◽  
Christmas Tree ◽  
Seed Sources ◽  
Christmas Trees ◽  
Adelges Cooleyi ◽  
Geographic Sources ◽  
Southern Rocky Mountain

Douglas fir, Pseudotsuga Menziesii (Mirb.) Franco, is a popular Christmas tree in the Northeast. In 1976 trees from 11 geographic sources ranging from British Columbia to southern Arizona and New Mexico were planted in a replicated design and managed as a commercial plantation. Information was also obtained on 10 seed sources grown on a commercial tree farm. All sources were hardy in the Connecticut plantings. In general, trees from southern Rocky Mountain sources were bluer, and grew faster than those from northern sources, but they were also more susceptible to attack by Cooley gall aphid, Adelges cooleyi (Gill), and rhabdocline needle cast fungus, Rhabdocline pseudotsugae (Syd.)

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