PERSONAL DE APOYO
ANDERSON Freda Elizabeth
congresos y reuniones científicas
Título:
Current status of research on biological control for Nassella neesiana and Nassella trichotoma (Poaceae) in Australia.
Autor/es:
ANDERSON, F.E., DIAZ, M.L. Y MCLAREN D.A.
Lugar:
Adelaida, Australia
Reunión:
Congreso; Fifteenth Australian Weed Conferrence; 2006
Resumen:
Summary: A project investigating potential biological control agents for Nassella neesiana and Nassella trichotoma in Australia has been underway since 1999. Surveys in Argentina have identified three rust fungi (Puccinia nassellae, Uromyces pencanus and Puccinia graminella) showing promise for control of N. neesiana and a rust (P. nassellae), a smut (Ustilago sp.) and a crown rotting fungus (Corticiaceae) as possible biological control agents of N. trichotoma. Both P. nassellae (ex N. neesiana) and U. pencanus are easy to rear, cause considerable damage to N. neesiana and appear to be host specific from preliminary testing undertaken so far. Trials are continuing to further investigate the P. nassellae and U. pencanus life cycles. P. graminella can be very damaging, appears to be quite host specific from the literature and is autoecious, completing its life cycle on N. neesiana. Techniques for mass production of P. graminella are currently being investigated as urediniospores are not known from its life cycle. The prospects for biological control of N. trichotoma are less promising. The virulence and host specificity of P. nassellae (ex N. trichotoma) are questionable. Similarly, it has been decided that the potential of Ustilago sp. as a biological control agent is limited, due to technical difficulties regularly encountered in inoculation experiments and the low incidence of the disease commonly observed in the field. Further research into the taxonomy, biology and life cycle of the Corticiaceae fungus is required before it can be considered as a biological control candidate for N. trichotoma.A project investigating potential biological control agents for Nassella neesiana and Nassella trichotoma in Australia has been underway since 1999. Surveys in Argentina have identified three rust fungi (Puccinia nassellae, Uromyces pencanus and Puccinia graminella) showing promise for control of N. neesiana and a rust (P. nassellae), a smut (Ustilago sp.) and a crown rotting fungus (Corticiaceae) as possible biological control agents of N. trichotoma. Both P. nassellae (ex N. neesiana) and U. pencanus are easy to rear, cause considerable damage to N. neesiana and appear to be host specific from preliminary testing undertaken so far. Trials are continuing to further investigate the P. nassellae and U. pencanus life cycles. P. graminella can be very damaging, appears to be quite host specific from the literature and is autoecious, completing its life cycle on N. neesiana. Techniques for mass production of P. graminella are currently being investigated as urediniospores are not known from its life cycle. The prospects for biological control of N. trichotoma are less promising. The virulence and host specificity of P. nassellae (ex N. trichotoma) are questionable. Similarly, it has been decided that the potential of Ustilago sp. as a biological control agent is limited, due to technical difficulties regularly encountered in inoculation experiments and the low incidence of the disease commonly observed in the field. Further research into the taxonomy, biology and life cycle of the Corticiaceae fungus is required before it can be considered as a biological control candidate for N. trichotoma.