Bioprospecting insecticidal compounds from plants native to Mato Grosso do Sul, Brazil

Abstract

RESUMO -(Bioprospecção de substâncias inseticidas de plantas nativas de Mato Grosso do Sul, Brasil Palavras-chave: metabólitos secundários, plantas inseticidas, gorgulho-do-milho, Sitophilus zeamaisABSTRACT -(Bioprospecting insecticidal compounds from plants native to Mato Grosso do Sul, Brazil). This paper reports on an evaluation of the insecticidal activity of extracts prepared from leaves of Tapirira guianensis Aubl. (Anacardiaceae), Attalea phalerata (Mart. ex Spreng.) Burret (Arecaceae), Eugenia uniflora L. (Myrtaceae), and Gomphrena elegans Mart. (Amaranthaceae) and from stems of Myracrodruon urundeuva Allemão (Anacardiaceae). Four extracts and 18 fractions with a range of polarities were tested. Tengram batches of wheat grains were each nebulized with 1 mL of a separate extract at 10% w/v. After solvent evaporation at 38 ºC, the grains were placed into flasks along with 20 unsexed 10-to 20-day old adult individuals of Sitophilus zeamais. The assessment was carried out on the fifth and tenth day by counting and discarding the dead insects. Leaf extracts of G. elegans showed an insecticidal effect ranging from 27% to 60% by the fifth day, whereas the effect of the remaining extracts tested (if active at all) did not exceed 20% in the same period. By the tenth day, the most active extracts were those of A. phalerata (hexanic, 36.5%) and all those of G. elegans (52-80.5%), whereas the effect of the other extracts did not exceed 30%.

Inseticidal Oils From Amazon Plants in Control of Fall Armyworm

“…ex Spreng. (Arecaceae) leaf extract toxicity against S. zeamais (SOUZA et al, 2008). The present study demonstrated the toxicity of Carapa guianensis oil against S. frugiperda caterpillars.…”

Use of plant oils from the southwestern Amazon for the control of maize weevil

“…The species of this family are well known in the Amazon region; however, there have been few studies on their insecticidal potential. Previous studies have reported the insecticidal potential of extracts obtained from species of the family Arecaceae against grain-infesting insects and have revealed significant toxic (Souza et al, 2008) and negative effects on feeding behavior and offspring production of insect pests (Rani et al, 2011). With respect to the oleoresin from Copaifera spp.…”

Essential Oils from Six Herbal Plants for Biocontrol of the Maize Weevil

“…Insecticidal activity of extracts prepared from leaves of plants in Anacardiaceae, Arecaceae, and Amaranthaceae on the maize weevil were evaluated. The insecticidal effect ranged from 20% to 60% by the fifth day depending on the plant extracted (Souza et al, 2008). Various combinations of Niger seed oil and 5% malahtion dust provided complete protection to maize seed from the maize weevil up to 90 d after infection (Yuya et al, 2009).…”