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Book Chapter

Chastagner G.A.. 1997. Christmas tree plantations. Compendium of Conifer Diseases. :88-89.

Journal Article

Chastagner G.A., Byther R.S.. 1983. Control of Swiss needle cast on Douglas-fir Christmas trees with aerial applications of chlorothalonil. Plant Disease. 67:790-792.

Michaels E., Chastagner G.A.. 1984. Distribution, severity and impact of Swiss needle cast in Douglas-fir Christmas trees in western Washington and Oregon. Plant Disease. 939

Chastagner G.A., Byther R.S.. 1983. Infection period of Phaeocryptopus gaeumannii on Douglas-fir needles in western Washington. Plant Disease. 67:811-813.

Michaels E., Chastagner G.A.. 1984. Seasonal availability of Phaeocryptopus gaeumannii ascospores and conditions that influence their release. Plant Disease. 68