The causes of poor establishment of ginger (Zingiber officinale) in Queensland, Australia

摘要: In recent years, Queensland ginger growers have sometimes found it difficult to establish crops. Seed-pieces either rot within a few weeks of planting or young plants grow poorly, shoots become yellow and eventually die. Surveys aimed at determining the cause problem showed that rhizomes designated for material were invariably infected by Fusarium oxysporum f. sp. zingiberi (Foz). The pathogen was also isolated from fungicide-treated seed-pieces ready planting, newly planted seed-pieces. soft-rot bacterium Erwinia chrysanthemi recovered rotting but nearly always in association with Foz. It not involved disease under normal soil moisture conditions, often occurred when inoculated both E. Foz wet soil. Experiments biocides confirmed main poor emergence, as only fungicides effective against (i.e. carbendazim benomyl) reduced percentage rotted ground. Poor crop establishment appears be more severe form than has been present industry many years. Changes farming practices are probably responsible increased severity, vegetative compatibility studies suggested virulent recently introduced.