ABSTRACT
Sitophilus zeamais (Motschulsky, 1885) (Coleoptera: Curculionidae) is one of the main insects that attack and severely compromise the quality of stored grains. Its control is done through chemical insecticides, which are not always effective, cause the selection of resistant insects, eliminate population of natural enemies, leave residues in food and contaminate the environment. In an attempt to minimize this problem, with the possibility of an agroecologic alternative, research with essential oils have shown as promising. In this context, the objective of this research was to identify the insectistatic potential of essential oil of pariparoba for control of maize-weevil. For this, bioassays were conducted to check the fumigant effect, the exposure in contact surface and resistance. There was fumigant effect, the values of CL50 e CL99 for the 24 h confinement of insects were respectively 0.95 and 6.73 µL g-1. The values of CL50 and CL99 for the 24 h of exposure in contact surface were, respectively, 0.34 and 4.91 µL cm-2. The repellency occurred in the first hour. So, the essential oil Pothomorphe umbellata presents insetistatic effect for the control of S. zeamais.
Key words:
sustainable agriculture; pest control; botanic insecticide; maize-weevil; monoterpenes
