Establishment, initial impact and persistence of parthenium summer rust Puccinia melampodii in north Queensland.

摘要: The parthenium summer rust ( Puccinia melampodii Dietel & Holway, Uredinales), native to Mexico, is a host-specific and highly damaging pathogen suited warmer weather conditions. Field release of the in north Queensland commenced January 2000. Monitoring at Plain Creek Cardigan Station confirmed field establishment within three weeks after release. Prevalence infection increased on (Parthenium hysterophorus L., Asteraceae) as plants matured. By end autumn, 71% were infected with 52% leaf area covered rust. However, negative impact seedling establishment, plant height, flower production, biomass density first year was not significant. Dry summers over subsequent years (2004–2006) resulted low levels incidence, culminating negligible weed.