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Integration of Biological and Chemical Controls for Rhizoctonia Aerial Blight and Root Rot of Rosemary

July 1997 , Volume 81 , Number  7
Pages  795 - 798

K. E. Conway , Department of Plant Pathology , and N. E. Maness and J. E. Motes , Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater 74078-3032



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Accepted for publication 10 April 1997.
ABSTRACT

Aerial blight, caused by Rhizoctonia solani AG-4, was identified as a major disease of greenhouse mist-produced rosemary cuttings. An isolate of the biocontrol fungus Laetisaria arvalis, selected for tolerance to the experimental fungicide CGA 173506, was used as an amendment to potting soil. Combined treatment of rosemary with L. arvalis and a foliar spray of the fungicide at one-half the recommended rate reduced disease more than treatment with either the fungus or fungicide alone. Similar synergism was not observed for combinations of Trichoderma harzianum as a soil amendment and a foliar spray of the fungicide iprodione applied at the labeled rate.


Additional keywords: ectotrophic growth, synergy

© 1997 The American Phytopathological Society