Resumen

PEREZ RODRIGUEZ, Yhosvanni et al. Biological activity of extracts of pimenta dioica l merrill on sitophilus oryzae l. Universidad y Sociedad [online]. 2019, vol.11, n.1, pp.369-375.  Epub 02-Mar-2019. ISSN 2218-3620.

The experiments were carried out in the Provincial Laboratory of Plant Health and the Center of Studies for Sustainable Agrarian Transformation of the University of Cienfuegos between the months of September 2017 to May 2018 to evaluate the effect of Pimenta dioica L. MERRILL by different methods with the use of three solvents on Sitophilus oryzae L. Insects in their adult stage of S. oryzae (Coleoptera; Curculionidae) were collected and subjected to a quarantine period; later, the tests were mounted with 10-day old adult insects . The dendrogram was formed by the maceration methods and the solvent hexane (PMH) and maceration and the solvent ethyl acetate (PMAE). Another group was formed by maceration methanol (PMM), soxhlet methanol (PSM), ultrasound hexane (PUH), ultrasound ethyl acetate (PUAE), ultrasound maceration (PUM) and a third group, composed of a single extract, formed by soxhlet hexane (PSH), which was separated from the other extracts. The weight loss of the grains was low, registering values that fluctuated between 3.37 and 5.25%, there being significant statistical difference in the grains treated with the PSH extract with the rest of the extracts used. The PSH, PMH and PUH extracts that show the values farthest from 1 stand out for their greater repellent effect (IR = 0.63), which implies a greater effect, whereas with the PSAE extracts the value closest to 1 (IR=0.73).

Palabras clave : Plant extracts; weevils; insecticide; warehouse pests.

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