Environmental Entomology (1992) 21, 183-190

Jennifer L. Woodring and Harry K. Kaya (1992)
Infectivity of Lagenidium giganteum to Culex tarsalis (Diptera: Culicidae) in rice field waters: Laboratory evaluation
Environmental Entomology 21 (1), 183-190
Abstract: Effects of rice field water quality and hostage on the infectivity of Lagenidium giganteum Couch to Culex tarsalis Coquillett were investigated in the laboratory for 3 yr. Selected water chemistry parameters were quantified to determine their influence on the corresponding infection rates. Large variation in dose-response was obtained among different water samples. When individual instars were exposed to a concentration of 10 zoospores/ml in different water samples, infection for the first through fourth instars respectively averaged 49, 42, 56, and 47%, with 78% of the variation in larval mortality significantly correlating with changes in common water chemistry parameters. Singly, none of the water chemistry variables accounted for >35% of the variation in infection rates. The causal relationships between changes in water chemistry and infectivity were unclear. When all instars were bioassayed in the same container to remove variation caused by different water samples, the first three instars were equally susceptible to infection, and the fourth instar was less susceptible. With exposure to 100 zoospores per ml, the period of lethal infection increased from 18 to 48 h as host age increased from the first to the fourth stadium.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Harry K. Kaya

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Culex tarsalis
Lagenidium giganteum (entomopathogen)	Culex tarsalis