Canadian Forest Service Publications

Fusarium avenaceum, a candidate biological control agent for Rubus spp (Abstract) 1996. Oleskevich, C.; Shamoun, S.F.; Punja, Z.K. Page 105 (Vol. 18(1)) in Canadian Journal of Plant Pathology, Proceedings: British Columbia Regional Meeting, The Canadian Phytopathological Society. October 23-24, 1995, Cowichan Lake, British Columbia. Canadian Phytopathological Society, Ottawa.

Year: 1996

Available from: Pacific Forestry Centre

Catalog ID: 4598

Language: English

CFS Availability: Order paper copy (free)

Abstract

Fusarium avenaceum, isolated from invasive Rubus strigosus in forest renewal sites, induced extensive foliar necrosis when applied in inundative doses to Rubus spp. in shadehouse assays. Inoculation with F. avenaceum grown on a rice substrate caused greater foliar damage than inoculum grown in liquid V8 or on PDA and MEA. Analysis and characterization of possible phytotoxic compounds produced by F. avenaceum is underway. Application of a formulation combining crude fungal-rice filtrate and 0.4% Silwet L-77 surfactant caused up to 50% foliar damage within 24-48 h, and up to 100% damage within 7 d, in R. parviflorus and R. spectabilis. Early summer inoculations caused more foliar necrosis than late summer applications. Fungus-infested, dried rice grains stored at 5_C remain viable, ground or intact, for at least 3 and 6 months, respectively. In field trials, short-term results indicate that Rubus spp. cover is damaged to a greater extent by a split application of F. avenaceum and a low dose of 0.02 M glyphosate than by a fungal application alone. Host range tests have shown that many conifer species are unaffected by the F. avenaceum formulation; further tests on associated forest flora are ongoing.