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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Matthew Conklin Flanery, Henry Ofosuhene Sintim, Beatrice Nuck Dingha and Louis Ernest Jackai
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DOI:10.17265/2161-6256/2016.02.001
Affiliation(s)
Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, Carver Hall, 1601 East Market St., Greensboro NC 27411, USA
ABSTRACT
The diamondback moth, Plutella
xylostella L., has developed resistance to most insecticides used for its
management. Suggested alternatives to forestall this process include
biorational insecticides in mixtures with low-risk insecticides. The aim of this study
was to select an insecticide or insecticide mixture that could be adopted by
small-scale growers for diamondback moth management. The effectiveness of four insecticide mixtures, i.e., Agroneem® Plus (neem-derived),
Spinosad (microbial origin), thiamethoxam (neonicotinoid) and a homemade
methanol Jalapeño pepper extract, in laboratory
bioassays was evaluated. Binary
mixtures were tested against single
products at manufacturer’s label
rates. These were applied to collard greens using the leaf dip method and fed
to the newly molted 2nd or 3rd instar larvae. Mixtures were evaluated for efficacy based on
larval mortality and consumption of leaf discs. The results showed interactions between Jalapeño pepper extract and Spinosad and between
the neem-derived Agroneem® Plus and thiamethoxam at some of the
tested concentrations. Mixtures with at any amount of Spinosad killed all
larvae. The neem-based product gave inconsistent results in some treatments; in
some case, increased leaf damage did not result in commensurate larval
mortalities. The reported resistance of diamondback moth larvae to Spinosad was
not observed during this study, neither with Spinosad alone nor in mixtures.
KEYWORDS
Agroneem, diamondback moth management, insecticide mixtures, Spinosad, thiamethoxam.
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