Canadian Forest Service Publications

Colorations, nécroses et microflore autour des blessures d'injection de thiabendazole dans l'orme. 1989. DesRochers, P.; Ouellette, G.B.; Thibault, J.-R. Phytoprotection 70 : 85-96.

Year: 1989

Available from: Laurentian Forestry Centre

Catalog ID: 14094

Language: French

CFS Availability: PDF (request by e-mail)


Two experiments (A and B) of injections with different dosages and concentrations of thiabendazole in American elms against Dutch elm disease were conducted to determine the effects of this fungicide as compared with water injection or wounding alone. Thiabendazole-injected trees had deeper, wider and longer discolorations around injection wounds than control trees injected with water or only wounded. A few very long cambial necrotic areas occurred above some wounds. In the experiments A, differences were observed in the microflora colonizing discolored wood around thiabendazole injection wounds as compared to the two controls. Some decay fungi were isolated from such injected wood but evidence is lacking that thiabendazole promotes wood colonization by these fungi when injections are made at the root flare. Inhibition test in vitro indicated that Coriolus versilor, Flammulina velutipes and Alternaria alternata were thiabendazole-tolerant, while Ophiostoma ulmi was inhibited by all concentrations of the fungicide tested in vitro.

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