Pest Management Science (2019) 75, 346-355

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Emma N.I. Weeks, Julie Baniszewski, Salvador A. Gezan, Sandra A. Allan, James P. Cuda and Bruce R. Stevens (2019)
Methionine as a safe and effective novel biorational mosquito larvicide
Pest Management Science 75 (2), 346-355
Abstract:
BACKGROUND
Mosquito larvicides provide a source-reduction strategy to diminish adult females that bite and potentially spread pathogens. Demands are mounting for new and innovative effective biorational larvicides, due to the development of resistance to some currently utilized mosquito larvicides, undesirable non-target effects, and US Environmental Protection Agency (EPA) restrictions. Methionine is a human nutrient essential amino acid that unexpectedly has been shown to be a valuable safe pest management tool against select insect pests that possess alkaline gut physiology. The present study evaluated larvicidal toxicity of methionine in several pestiferous mosquito (Diptera: Culicidae) genera.
RESULTS
Concentration-dependent DL-methionine kinetics assays of survival and pupation were conducted in larvae of Aedes albopictus Skuse, Anopheles quadrimaculatus Say, and Culex tarsalis Coquillett in glass jars. High concentrations of DL-methionine yielded 100% mortality for all test species and prevented pupation at a rate equivalent to Bacillus thuringiensis israelensis (Bti) treatments. Concentration kinetics indicated that An. quadrimaculatus was 10-fold more sensitive to DL-methionine than Ae. albopictus and Cx. tarsalis.
CONCLUSIONS
EPA regulations currently exempt methionine in pesticide formulations applied to agricultural crops. This study demonstrates that methionine is a highly effective mosquito larvicide that can provide a beneficial new biorational, environmentally sustainable tool to control pestiferous mosquitoes.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Emma N.I. Weeks, James P. Cuda

Research topic(s) for pests/diseases/weeds:
control - general
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Culex tarsalis
Anopheles quadrimaculatus
Aedes albopictus
Bacillus thuringiensis var. israelensis (entomopathogen) Culex tarsalis
Bacillus thuringiensis var. israelensis (entomopathogen) Anopheles quadrimaculatus
Bacillus thuringiensis var. israelensis (entomopathogen) Aedes albopictus