Insecticidal activity of Vitex cymosa (Lamiaceae) and Eschweilera pedicellata (Lecythidaceae) extracts against Sitophilus zeamais adults (Curculionidae)
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Data
2012
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Resumo
This study evaluated insecticidal and repellent effects of Vitex cymosa and Eschweilera pedicellata extracts
against Sitophilus zeamais adults. Contact on filter paper discs and contaminated grain ingestion assays were
performed. The repellent effect was evaluated with the “preferential area” method. The extracts provided good
results by ingestion and as repellents, but not by contact. V. cymosa branches methanol extract was the best,
killing nearly 70% of the individuals at its highest concentration, followed by V. cymosa flowers
dichloromethane extract and E. pedicellata branches aqueous extract. Among these, only V. cymosa leaves
dichloromethane extract did not reduce the number of individuals in F1. Analyzing the repellent effect, when
the variable concentration was taken into account, no extract was dose-dependent, and the intensity of response
varied with the time interval. Among the extracts tested, V. cymosa branches methanol extract is the most
promising one, which negative effect on parental resulted in F1 decrease number and the ingestion way was the
most efficient.
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Botanical insecticides, Weevil, Plant extracts, Stored grain pests
Citação
OLIVEIRA, Taciane A. de et al. Insecticidal activity of Vitex cymosa (Lamiaceae) and Eschweilera pedicellata (Lecythidaceae) extracts against Sitophilus zeamais adults (Curculionidae). Emirates Journal of Food and Agriculture, Abu Dhabi -Al Ain , v. 24, n. 1, p. 49-56, 2012.