Abstract
Magarey, R. C., and Mewing, C. M. 1994. Effect of sugarcane cultivars and location on inoculum density of Pachymetra chaunorhiza in Queensland. Plant Dis. 78:1193-1196. The influence of sugarcane cultivars on the inoculum density of Pachymetra chaunorhiza was assessed by monitoring the changes in numbers of oospores of P. chaunorhiza in the soil of field plots by a direct count assay. Cultivars with different levels of disease resistance were planted at each of six sites in a district where Pachymetra root rot was known to occur. Inoculum densities were quantified before planting and after either 2 or 3 yr of cropping. The effects of cultivar, site, and the interaction between site and cultivar were examined by analysis of variance. All three parameters were significant, suggesting that cultivars have a measurable effect on inoculum density and that this effect varies with location. Field ratings were assigned on the basis of changes in soil inoculum density and were compared with glasshouse ratings for each cultivar. The correlation between glasshouse and field ratings was high (r 2 0.59, and P < 0.001). Monitoring changes in soil inoculum density in fallow plots enabled the natural rate of attrition of oospores in the absence of the host to be assessed. Oospores survived in fallow plots for at least 5 yr.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
