01955nam a2200169 a 450000100080000000500110000800800410001910000180006024501310007826001970020952012930040665000180169965300120171770000180172970000180174770000200176514871152018-06-06       1999    bl uuuu     u00u1 u    #d1 aPRATES, H. T.  aThe potential use of plant substances extracted from the Brazilian flora to control stored grain pests.h[electronic resource]  aIn: INTERNATIONAL WORKING CONFERENCE ON STORED PRODUCT PROTECTION, 7., 1998, Beijing, China. Proceedings... Chengdu: Sichuan Publishing House of Science and Technology, 1999. p. 820-825.c1999  aThe damage caused by stored grain insects in Brazil is estimated to be atound 8 % of production. Insects responsible for such loss are among others Sitophilus zeumuis. Sifophilu8 ol'yzue, Rhyzopel.tha clominica and Tribolium castulleum. Synthetic insecticides are the conventional way to control these insect pests. However, natural products from plants have been studied as an ecologically more effective alternative in protecting stored grains. A screening program of plant substances extracted from Brazilian flora was initiated against those insects. Bioassays to determine the insecticidaI activity consisted of tests for fumigation, contact, and contact and/or ingcstion. In ali assays. twenty individual adults of each insect were used in each of three replica te assays. A control test was prepared the same way but no impregnating substance was used. Ali tests were carried out at room temperature (26: C ). Observations on the survival rate of insects were made 24 h after contact and efficacy (%) was calculated using Abbott procedure. Results have shown that cineole, limonene and EllCUlyptU8 globulus and E. eamaldulensis essential oils showed toxic effect to insects through cutic1e (contact test) and/or by ingestion (contact and or ingestion test) and fumigation activity.  aArmazenamento  aInsetos1 aSANTOS, J. P.1 aWAQUIL, J. M.1 aOLIVEIRA, A. B.