Influência de pó vegetal de cinamomo (Melia azedarach) sobre Sitophilus spp

Abstract

The objective of this work was to evaluate the insecticidal and repellent action of cinnamon (Melia azedarach) on corn weevil, using plant powders obtained from different parts of the plant. A completely randomized experimental design with five replications was used. The treatments used were: leaf powder, branch powder, wood powder and fruit powder, all with a dose of 20 g / kg maize seed. In the test of repellency after 24 hours of the implantation of the experiment were counted the number of insects in each treatment and after having submitted the data to the test t at the level of 5% of probability and carried out the calculation of the repellency index, the treatment with powder of branches presented the lowest index (0.62), being the most repellent of all treatments, followed by wood dust (0.85), leaf powder (0.91) and fruit powder (0.93). For the mortality test, daily mortality of insects was evaluated for a period of 10 days, after which the data were submitted to the Tukey test with 5% probability. For this test the mortality verified was incipient, not exceeding five individuals killed in the treatment of the branches, which had a higher mortality rate, although it did not differ from the others. It was concluded that the different parts used presented repellent action for the weevil in all treatments, being considered efficient for this test, but it was not effective for mortality.