Research Article

Evaluation of Pathogenicity of Entomopathogenic Oomycetes Lagenidium giganteum and L. ajelloi against Anopheles Mosquito Larvae

Table 2

Time taken by a specific concentration of Lagenidium ajelloi and L. giganteum zoospores to kill 50% larvae (LT50).

Fungal speciesConcentration (zoospore/ml)LT50 lower limit (hours)LT50 (hours)LT50 upper limit (hours)SE

L.ajelloi100045.4362.5886.19±4.66
200035.5963.58113.58±8.89
300055.7158.9562.18±1.64
400055.6858.8762.01±1.62
500054.5158.1961.88±1.87

L. giganteum1000101.24105.55109.87±2.19
200099.96104.17108.38±2.14
300096.62100.59104.56±2.01
400093.7497.52101.30±1.92
500086.1589.3192.48±1.60

As expected, an increase in the concentration of zoospores resulted in a shorter LT50. The shortest LT50 was observed in L. ajelloi zoospores indicating that L. ajelloi is more potent against A. gambiae larvae compared to L. giganteum.