Solute effects on Lagenidium giganteum: zoospore motility and bioassay reproducibility

Effects of temperature, pH and salinity on the infection of Leptolegnia chapmanii Seymour (Peronosporomycetes) in mosquito larvae

“…This is in contrast to L. giganteum which cannot infect larvae in water with greater than 1 ppt NaCl (Merriam and Axtell, 1982;Lord and Roberts, 1985). While this might restrict the natural occurrence of L. giganteum to freshwater habitats, L. chapmanii has demonstrated a tolerance to high salinity which at some mosquito sites can attain levels of up to 20 ppt (Petersen and Chapman, 1970).…”

“…Mortality rates greater than 60% were recorded from pH 4 to 10 which is within the range of many mosquito larval habitats (MacGregor, 1929). Lord and Roberts (1985) determined that statistically significant zoospores production was recorded for several isolates of L. giganteum in artificial media at pH from 4.5 to 8.4. The effect of pH on the infectivity of L. chapmanii or L. giganteum for larval mosquitoes has not been investigated prior to this study.…”