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Proceedings of Past Forest Nursery Association Meetings:

Influence of Soil Fumigation and Fungicide Application on Outplanted Ponderosa Pine Seedlings
D.S. Page-Dumroese and A.E. Harvey
1994: Moscow, ID
Ponderosa pine (Pinus ponderosa Laws.) was used as a model to determine the effects of soil fumigation and fungicide applications on outplanted stock in moderately-fertile soils of the Intermountain West, U.S.A. Five soil fumigation treatments (Vapam), singularly and in combination with fungicide (triadimefon) applications, were compared to a control. Growth characteristics, nutrition, and ectomycorrhizal colonization were evaluated. Seedling height growth at the end of the fourth growing season was best after spring fumigation. Greatest ectomycorrhizal colonization occurred in the nonfumigated treatment with fungicide applied before planting. Generally, spring or fall soil fumigation treatment, without fungicide applications, produced seedlings with the best growth. These results suggest that soil fumigation applications could improve early performance of ponderosa pine when reforesting sites with abundant, native inoculum. Ponderosa pine planted on moisture or nutrient limited sites, with adequate ectomycorrhizal inoculum, may benefit from elimination of ectomycorrhizae in the nursery.
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