Evaluation of a Formulation of Cercospora Rodmanii for Infectivity and Pathogenicity of Waterhyacinth.
Abstract
As a part of a Large-Scale Operations Management Test (LSOMT) of insects and pathogens for the control of waterhyacinth in Louisiana, a formulation of the fungal pathogen Cercospora rodmanii was preliminarily evaluated to determine application rates required to achieve adequate infection of water-hyacinth under environmental conditions normally found in Louisiana. In a spring study, a C. rodmanii formulation containing one million viable propagules per gram was applied to test tanks at rates of 0, 5, 10, and 20 g/sq m. After 6 weeks, it was concluded that a treatment rate of five million viable propagules per square meter provides adequate infection of waterhyacinth in a spring application. In a fall study, treatment rates of 0, 1, 2.5, and 10 g/sq m of the C. rodmanii formulation containing four million viable propagules per gram were applied to replicated test tanks. After 6 weeks, all tanks that received C. rodmanii were infected by the fungus, but there were no significant differences in the level of infection among C. rodmanii treatments. Based on the results of these studies, rates of five and four million viable propagules per square metre will be used for large-scale applications of C. rodmanii in spring and fall tests, respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA102051
Entities
People
- Dana R. Sanders Sr.
- Edwin A. Theriot
- Russell F. Theriot