In vitro biological activity of plant extracts from southeastern Coahuila, Mexico, against Sitophilus oryzae (L.) (Coleoptera: Curculionidae)
DOI:
https://doi.org/10.59741/agraria.v6i1-2-3.440Keywords:
raw extracts, botanic insecticide, rice weevilAbstract
Control of insect pests of stored grains and seed, is made through the intensive use of synthetic pesticides; this has brought about resistance, accumulation of toxics in the atmosphere, and poisoning in human beings and animals. That is why the aim of this assay was to evaluate the biological effectiveness of 10 crude plant extracts from the South-eastern region of the Mexican state of Coahuila, and a conventional witness (Azadirachta in dica) on Sitophilus oryzae L. A set of biotests was carried out with the techniques of: residual film in bottles; residual film on maize grains, and residual film on sacks. The extracts were sprinkled on the surface of the sacks that were stored up to 180 days under simulated warehouse conditions. A completely randomized experimental design, with three replications, was used. The extract of A. indica (neem) showed the higher insecticide effect with a mortality rate of 62 % in 48 h, using the residual film technique in glass bottles. A Sitophilus adult rejection effect was observed with A. indica, y L. japonicum in the residual film test in maize grains. The extracts of A. indica and A. lechuguilla in jute sacks showed more attraction to S. oryzae, and an effect of no preference or rejection with Prosopis juliflora, Ligustrum japonicum, and Schinus molle. When using rafia sacks Argemone Mexicana showed the highest effect of attraction while the extracts of P. juliflora, A. indica, L. japonicum, Pinus cembroides and A. lechuguilla showed a rejection effect.
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