CONTAINERIZED ENGELMANN SPRUCE SEEDLING DISEASES AT THE USDA FOREST SERVICE NURSERY COEUR D'ALENE, IDAHO
作者： Carma J. Gilligan , Robert L. James
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摘要: An evaluation was conducted at the USDA Forest Service Nursery, Coeur d'Alene, Idaho, to quantify occurrence of diseases in spring 1984 crop of containerized Engelmann spruce seedlings. The included 19 separate seedlots from seven National Forests Northern Region. overall production rate 94.5 percent achieved for (5.5 the crop lost or other mortality factors). Dead diseased seedlings accounted only 0.7 total losses, whereas empty cells remaining 4.8 percent. Major disease organisms included Sirococcus strobilinus, Fusarium oxysporum, F. avenaceum, solani, F. tricinctum, Cylindrocarpon tenue, Phoma herbarum, P. fimeti, and Botrytis cinerep. caused 18 seedlots usually encountered about 11 weeks after sowing. occurred with greatest frequency shortly germinate emergence.
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