The use of residues from in citrus industry to control the drywood termite Cryptotermes brevis (isopetera:Kalotermitidae)

RESIDUOS

CERAS CITRICAS

TERMITAS DE MADERA

CONTROL ALTERNATIVO

2008

BIBLIOGRAFÍA NACIONAL QUÍMICA

Waxes from lime (L) and orange (0) fruits, residues from the citrus industry, were evaluated as possible control methods for Cryptotermes brevis (Walker), the dry-wood termite. This termite is apermanent threat to wooden materials and goods in tropical and subtropical countries. To identify active compounds, orange (0) and lime (L) waxes were partitioned between hexane and methanol. The methanolic extracts of both waxes were further fractionated by vacuum chromatography on silica gel using a polarity gradient of chloroform (01, L1), ethyl acetate (02, L2) and methanol (03, L3). These fractions were "painted" on Pinus sp. blocks. Termite mortality (expressed as % of dead insects) was evaluated over a 60 day period. 01 was active, resulting in an insect mortality of 80% at 45 days. The L2 fraction caused 45% mortality in 28 days The lime wax fraction (L3) resulted in 86% insect mortality at the end of the 60 days. A number of treated wood blocks were stored for 5 months, and exposed to termites after this period. Blocks treated with the O1 fraction were not consumed at all, but 75% of the insects exposed died. The evaluation of the chemical composition of active fractions revealed the presence of oxygenated terpenes and coumarins in O1. Furanocoumarins, flavonoids and limonin, compounds reported as bioactive, were identified in the wax fractions.

Sociobiology v. 51, no. 1, 2008. -- p. 283-293

Universidad Estadual de Feira de Santana

2008

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ISSN: 0361-6525