Efficacy of bioactive compounds and their association with different cowpea cultivars against their major stored pest

Efficacy of bioactive compounds and their association with different cowpea cultivars against their major stored pest

Background Stored grain insects are controlled with fumigant insecticides which can select resistant insect populations and cause environmental and applicator contamination. Thus, resistant cultivars and chemical constituents of essential oils are an alternative to the almost exclusive use of these...

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Bibliographic Details
Published in:Pest management science Vol. 76; no. 11; pp. 3770 - 3779
Main Authors: Barbosa, Douglas Re S, Oliveira, José V, Silva, Paulo HS, Breda, Mariana O, Andrade Dutra, Kamilla, Lopes, Fabiana SC, Araújo, Alice MN
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 01-11-2020
Wiley Subscription Services, Inc
Subjects:
Anethole
Bioactive compounds
Biocompatibility
botanical insecticides
Chemical pollution
Constituents
Contamination
cowpea weevil
Cowpeas
Cultivars
Eggs
Essential oils
Eugenol
Grain storage
Insecticide resistance
Insecticides
Insects
Oils & fats
Parameters
Pest resistance
plant resistance
Toxicity
Toxicity testing
Viability
Vigna unguiculata
Weight loss
Botanical insecticides
Cowpea weevil
Plant resistance
Vigna unguiculata
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Summary:Background Stored grain insects are controlled with fumigant insecticides which can select resistant insect populations and cause environmental and applicator contamination. Thus, resistant cultivars and chemical constituents of essential oils are an alternative to the almost exclusive use of these insecticides. The effects of the combination of cowpea cultivars Vigna unguiculata (L.) Walp. with chemical constituents of essential oils against Callosobruchus maculatus were determined. Four cowpea cultivars: BRS Tracuateua, BR 17 Gurgueia, Epace 10 and Sempre Verde (insect rearing) untreated were used in the experiments and combined with chemical constituents of essential oil: eugenol, geraniol and trans‐anethole. The biological parameters observed were: total egg number and eggs per grain, egg viability (%), insects emerged and insects per grain, immature stage viability (%), instantaneous rate of growth (ri), insect dry weight (mg), grain weight loss (%) and egg‐adult period. Results When comparing all biological parameters, the cultivars BRS Tracuateua and BR 17 Gurgueia were harmful to C. maculatus. In the toxicity tests, the results showed that LC30 and LC50 of the chemical constituents ranged from 54.77 to 103.48 ppm and 60.99 to 125.18 ppm, respectively. In most of the biological parameters, LC50 had adverse effects significantly higher than LC30 and BR 17 Gurgueia treated were harmful to C. maculatus. Conclusions Overall, the findings showed that BR 17 Gurgueia combined with eugenol and geraniol more significantly affected the biological parameters of C. maculatus than when associated with trans‐anethole, reducing egg number, insects emerged and egg viability. © 2020 Society of Chemical Industry The effects of the combination of cowpea cultivars Vigna unguiculata (L.) Walp. with chemical constituents of essential oils against Callosobruchus maculatus were determined. © 2020 Society of Chemical Industry
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.5926