Inoculum Density and Population Dynamics of Suppressive and PathogenicStreptomycesStrains and Their Relationship to Biological Control of Potato Scab

摘要: Abstract Several Streptomyces strains are capable of suppressing potato scab caused by scabies. Although these have been successful in the biocontrol field, little is known about how populations pathogenic rhizosphere influenced inoculation suppressive strains. The effects inoculum densities and on their respective roots soil were examined during growing season. relationships between density or population disease severity also investigated. Populations strain 93 increased significantly with increasing dose. At its highest dose, reached a greater than 10 6 CFU/g root 14 weeks after planting. ability to increase was hindered at high doses pathogen, suggesting that density-dependent competitive interactions may be occurring two antagonists. Strain most effective preventing early season (8 planting), when tubers susceptible disease. Population more highly negatively correlated roots, rather primary source for tubers.