The inhibitory effect of tropolone and hinokitiol on the mycelium growth of Phoma narcissi in vitro

Abstract

Tropolone and hinokitiol (β-thujaplicin) that are present in heartwood of several Cupressaceae trees are known for their antibacterial, antifungal and insecticidal properties. In the present studies it was showed that tropolone and hinokitiol greatly inhibited in vitro, on PDA medium, the mycelium growth of Phoma narcissi, a pathogen of Hippeastrum and other species of family Amaryllidaceae. Total inhibition of the mycelium growth of Phoma narcissi took place at a tropolone concentration of 6.0 µg·cm-3 and at a hinokitiol concentration of 50.0 µg·cm-3. Fungicidal doses of tropolone and hinokitiol for the mycelium growth of Phoma narcissi were also documented. The results presented in this paper are discussed with data available in literature on the antifungal action of tropolone and hinokitiol on other species of pathogenic fungi.

Keywords

• Phoma narcissi
• mycelium growth
• tropolone
• hinokitiol (β-thujaplicin)