Abstract

Usingin vitro tests, 21 oil extracts were assessed at 0.1, 1.0 and 10% concentrations for effects on conidium germination, germtube elongation and mycelial growth in Botrytis cinerea. Reduction (P≤0.05) of conidium germination and germtube length was achieved at 0.1% concentration with extracts of thyme R (Thymus capitatus) (100% and 100% respectively), clove (Syzygium aromaticum) (67% and 93% respectively) and Australian minttree (Prostanthera rotundifolia) (65% and 65% respectively). Thyme R oil and Trichoderma harzianum metabolites 6pentyl-alpha-pyrone (6-PAP) and a 6-PAP derivative, gave the greatest inhibition of mycelial growth of the extracts tested at 10% concentration.

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