Reports results of special treatments studying 

 effects of shade, watering, and weeding. 



U.S. FOREST SERVICE. 1956. Spruce mealy- 

 bug. Intermountain Forest and Range Expt. 

 Sta. Ann. Rpt.: 35. 



Infestation of Engelmann spruce by spruce 

 mealybug (Puto sp.) in southern Utah. 



U.S. FOREST SERVICE. 1957. Forest insect 

 conditions in the intermountain and northern 

 Rocky Mountain states. Intermountain Forest 

 and Range Expt. Sta. Misc. Pub. 11, 6 pp. 



Reports decline in 1956 of a major epidemic 

 of Engelmann spruce beetle dating from 1952; 

 also reports a serious outbreak in Wyoming. 



U.S. FOREST SERVICE. 1957. Summary of 

 Engelmann spruce seminar at Fraser Experi- 

 mental Forest August 30-31, 1956. 17 pp. 

 Rocky Mountain Forest and Range Expt. Sta. 



U.S. FOREST SERVICE. 1957; 1958. Artificial 

 regeneration tried in beetle -killed spruce 

 stands. Rocky Mountain Forest and Range 

 Expt. Sta. Ann. Rpt. 1957: 25-27; Ann. Rpt. 

 1958: 47-53. 



U.S. FOREST SERVICE. 1958. Forest insect 

 conditions in the intermountain and northern 

 Rocky Mountain states during 1957. Inter- 

 mountain Forest and Range Expt. Sta. Misc. 

 Pub. 13, 11 pp. 



U.S. FOREST SERVICE. 1959. Forest insect 

 conditions in the intermountain and northern 

 Rocky Mountain states during 1958. Inter- 

 mountain Forest and Range Expt. Sta. Misc. 

 Pub. 18, 12 pp. 



U.S. FOREST SERVICE. 1959. Spruce mealy- 

 bug. Intermountain Forest and Range Expt. 

 Sta. Ann. Rpt.: 21-23. 



Southern Utah. 



U.S. FOREST SERVICE. 1960. Engelmann 



spruce beetle control by preventive measures . 

 Rocky Mountain Forest and Range Expt. Sta. 

 Ann. Rpt.: 8. 



U.S. FOREST SERVICE. 1960. Engelmann 

 spruce regeneration. Intermountain Forest 

 and Range Expt. Sta. Ann. Rpt.: 5-6. 



Reports results of studies of seedbed prep- 

 aration. 



U.S. FOREST SERVICE. 1960. Forest insect 

 conditions in the intermountain and northern 

 Rocky Mountain states during 1959. Inter- 

 mountain Forest and Range Expt. Sta. Misc. 

 Pub. 23, 12 pp. 



U.S. FOREST SERVICE. 1960. New records 

 for lodgepole pine dwarfmistletoe. Rocky 

 Mountain Forest and Range Expt. Sta. Ann. 

 Rpt.: 11. 



Lodgepole pine dwarfmistletoe (Arceuthobium 

 americanum ) was found for the first time on 

 Engelmann spruce. 



U.S. FOREST SERVICE. 1961. Biological fac- 

 tors control local Engelmann spruce beetle 

 outbreak. Rocky Mountain Forest and Range 

 Expt. Sta. Ann. Rpt.: 16-17. 



U.S. FOREST SERVICE. 1961. Woodpeckers 

 aggregate in Engelmann spruce beetle out^ 

 breaks. Rocky Mountain Forest and Range 

 Expt. Sta. Ann. Rpt.: 18-19. 



U.S. FOREST SERVICE. 1962. Photosynthesis 

 of spruce seedlings favored by partial shade . 

 Rocky Mountain Forest and Range Expt. Sta. 

 Ann. Rpt.: 26-27. 



U.S. FOREST SERVICE. 1962. Windthrow 

 losses increasing in beetle -killed Engelmann 

 spruce. Rocky Mountain Forest and Range 

 Expt. Sta. Ann. Rpt.: 48. 



U.S. FOREST SERVICE and BUREAU OF ENTO- 

 MOLOGY AND PLANT QUARANTINE. 1951 . 

 Engelmann spruce bark beetle control project 

 Colorado 1951, 26 pp. 



VAARTAJA, O. 1959. Evidence of photoperiodi 

 ecotypes in trees. Ecol. Monog. 29: 91-111. 



VALK, U. 1960. Eestisse introdutseeritud 

 kuused. Eesti NSV Teaduste Akadeemia 

 Toimetised, Tallinn (Bioloogiline Seeria), 

 1960(1): 60-65. 



Lists spruces introduced into Estonia and 

 gives English summary. 



VAN DERSAL, WILLIAM R. 1938. Native 

 woody plants of the United States , their 

 erosion -control and wildlife values. U.S. 

 Dept. Agr. Misc. Pub. 303, 362 pp. 



VAUX , HENRY J. 1954. Some implications of 

 the spruce beetle control and salvage pro- 



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