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Al-Khatib, Kassim. 2019. Herbicide Symptoms [online]. University of California Division of Agriculture and Natural Resources. Online: http://herbicidesymptoms.ipm.ucanr.edu/?showSiteInfo=true

 

Costello, L., E. Perry, N. Matheny, J. Henry, and P. Geisel. 2003. Abiotic Disorders of Landscape Plants: A Diagnostic Guide. University of California Agriculture and Natural Resources Publication 3420. 242 pp.

 

Cranshaw, W. and D. Shetlar. 2017. Garden Insects of North America, 2nd Edition. Princeton University Press. Princeton, N.J. 704 pp.

 

Cranshaw, W., W. Jacobi, D. Leatherman, and N. Tisserat. 2014. Insects and Diseases of Woody Plants in Colorado. Colorado State University Extension Bulletin 506A. 322 pp.

 

Farrar, J. 1995. Trees of the Northern United States and Canada. Blackwell Publishing, Ames, Iowa. 502 pp.

 

ForestryImages.org. 2020. Forestry Images. The University of Georgia - Center for Invasive Species and Ecosystem Health. Online: https://www.forestryimages.org/

 

Hansen, E., Chastagner, G.A. and K.J. Lewis. 2018. Compendium of Conifer Diseases. 2nd Edition. APS Press. 224 pp.

 

Hollingsworth, C., editor. 2019. Pacific Northwest Insect Management Handbook [online]. Corvallis, OR: Oregon State University. http://pnwhandbooks.org/insect (accessed 31 March 2019).

 

Mangold, J. and H. Parkinson. 2018. Plant Identification Basics. MT201304AG. Montana State University Extension, Bozeman, MT. 7 pp.

 

Pscheidt, J.W. and C.M. Ocamb. 2019. Pacific Northwest Plant Disease Management Handbook. Oregon State University, Corvallis, Oregon. Online: https://pnwhandbooks.org/plantdisease