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Fungicides Influence Growth and Development of Specific Ectomycorrhizae on Loblolly Pine Seedlings

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Abstract:

Four fungicides--captan, benomyl, PCNB, and benodanil--in single (1x) and double (2x) applications were used as soil drenches on fumigated nursery soil infested with Pisolithus tinctorius or Thelephora terrestris after sowing seed of Pinus taeda. Control soil was naturally colonized. Seedlings were lifted 8 months after sowing. Ectomycorrhizal development on seedlings and basidiocarp production by P. tinctorius was significantly greater than fungicide-free controls in plots treated with benomyl and captan at either rate and less in plots treated with benodanil; PCNB had no effect. Ectomycorrhizal development by T. terrestris was greatest in plots with 2x rates of benomyl and captan. PCNB and benodanil had no effect on Thelephora development but both fungicides decreased basidiocarp production. Considerable seedling mortality occurred shortly after applications of PCNB, which reduced plot density and resulted in larger seedlings in those plots. The incidence of fusiform rust galls was reduced by benodanil in all fungus treatments. In a concurrent laboratory study of test fungi on agar medium, P. tinctorius did not grow on any concentration of bendodanil or on 2x or 4x rates of PCNB. Mycelial growth was strongly inhibited by PCNB at 0.5x and at the 1x rate, and slightly inhibited by benomyl at 2x and 4x application rates; captan had no effect on mycelial growth. Benodanil completely inhibited mycelial growth of T. terrestris but growth was only slightly inhibited by benomyl at the 4x rate; captan and PCNB had no effect. Forest Sci. 27:167-176.

Keywords: Cronartium quercuum f. sp. fusiforme; Pinus taeda; fungicide-nontarget organisms; seedling quality

Document Type: Journal Article

Affiliations: Plant Pathologist, Forestry Sciences Laboratory, Southeastern Forest Experiment Station, U.S. Forest Service, Athens, GA 30602

Publication date: March 1, 1981

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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