Abstract
Fusarium root rot, caused by Fusarium oxysporum schl. f. sp. pini (Hartig) Snyder & Hansen, causes severe losses to some species of conifers even though beds are fumigated with methyl bromide-chloropicrin (3:2) the autumn before spring seeding. Benomyl (methyl-l-(butylcarbamoyl)-2-benzimidazole carbamate) at ll.2 kg a.i./ha or captan (N-trichloromethylthio-4cyclohexene-l,2-dicaboximide) at 7.3 kg a.i./ha were applied to beds of sugar pine (Pinus lambertiana Dougl.) on Central Point sandy loam to control seedling mortality (Cooley 1983), but no measurement was made of its persistence or of its effect on soil microbial activity.
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