Phytophthora Root Rot of Christmas Trees Quiz Phytophthora Root Rot of Christmas Trees Quiz Take the Quiz! Get a perfect score! Earn the medallion! Questions may have more than one correct answer. Be sure to select all answers that are correct. If you don't get a perfect score, you can take the quiz again until you do! Please provide your email address to receive your digital medallion. Reference: Phytophthora Root Rot of Christmas Trees Fact Sheet.Email(Required) 1) Phytophthora root rot of Christmas trees affects primarily Douglas-firs. Pines, true firs, and spruces are relatively resistant to the disease.(Required) true false 2) Phytophthora root rot of Christmas trees is typically lethal.(Required) true false 3) Phytophthora root rot of Christmas trees is caused by a(Required) bacterium fungus water mold phytoplasma nematode virus none of the above 4) Symptoms and signs of Phytophthora root rot of Christmas trees can include(Required) branch dieback honey mushrooms rhizomorphs discolored roots mycelial fans yellowing and reddening of needles 5) The Phytophthora root rot pathogen produces thick-walled resting spores that can survive in the soil for many years.(Required) true false 6) Management of Phytophthora root rot of Christmas trees can involve(Required) planting resistant varieties of tree species prone to the disease avoiding planting in low areas or areas with heavy soils that drain poorly increasing fertilization, particularly with nitrogen, to help trees outgrow any root loss from the disease using preventative fungicide treatments using pond or river water for irrigation whenever possible, as this water often contains microbes antagonistic towards the Phytophthora root rot pathogen planting to avoid J-roots and girdling roots that can predispose trees to Phytophthora root rot none of the above Δ
