disease_substrate_wood
trunk
Trees may become infected when young or mature. The disease is usually fatal, but plants often take 6 months to 2 years to die. Individual trees vary in their susceptibility and the speed of symptom progression. The fungus infects via the roots and spreads internally through the vascular tissues. Initial symptoms are localised to individual leaves, whose leaflets bleach and dry from the base upwards and fold inwards towards the leaf rachis. Brown streaking develops along the rachis and the whole leaf then collapses downwards towards the trunk. These symptoms spread to adjacent leaves on the plant until the terminal bud is infected, when the plant dies. Internally, localised vascular browning occurs in infected roots, stems and leaf stalks.
Fusarium oxysporum var. albedinis
Fusarium oxysporum var. albedinis