Notes: Effects of the Herbicides Bifenox, DCPA, and Napropamide on Mycorrhiza Development of Ponderosa Pine and Douglas-fir Seedlings in Six Western Nurseries

Author: Trappe, James M.

Source: Forest Science, Volume 29, Number 3, 1 September 1983 , pp. 464-468(5)

Publisher: Society of American Foresters

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Abstract:

The herbicides bifenox, DCPA, and napropamide were each applied at two different rates to beds of Douglas-fir and ponderosa pine for weed control in several nurseries in California, Oregon, and Washington. At the end of the first growing season no herbicide treatment significantly reduced proportion of feeder roots colonized by mycorrhizal fungi or number of mycorrhizal types as compared to controls for either tree species. Ponderosa pine seedlings treated with DCPA, however, had a significantly greater proportion of feeder roots mycorrhizal than those treated with the other two herbicides and a significantly greater mean number of mycorrhiza types than controls or napropamide treatments. Douglas-fir treated with napropamide had significantly more mycorrhiza types, reflecting a greater diversity of mycorrhizal fungi, than those treated with DCPA or bifenox. Forest Sci. 29:464-468.

Keywords: Pinus ponderosa; Pseudotsuga menziesii; root growth; mycorrhizal fungi

Document Type: Miscellaneous

Affiliations: 1: Principal Mycologist, Pacific Northwest Forest and Range Experiment Station, Forestry Sciences Laboratory, 3200 Jefferson Way, Corvallis, Oregon 97331

Publication date: 1983-09-01

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