Effects of Schinus terebinthifolius extracts on the control of Sitophilus species in stored wheat grains

The objective of this study is to evaluate the efficacy of Schinus terebinthifolius extract in controlling the insects of stored wheat. The experimental design was completely randomized with 10 replicates in a factorial scheme of 4 × 9, for extracts (control, aqueous extract, and hydro alcoholic extract of 5 and 15% of Brazilian pepper tree) and nine dates of evaluation (3, 6, 9, 16, 23, 30, 37, 44 and 51 days) after application. Ten weevil insects were inoculated into 200 g of wheat seed by applying 2 ml of each treatment. There is a control effect on the emergence and adults of Sitophilus species in wheat stored using S. terebinthifolius extracts. Up to the first nine days of storage, the hydro alcoholic extract (15%) has a relative efficacy of 35%. At 9 and 16 days of evaluation, hydro alcoholic extracts (5 and 15%) presented relative efficacy of 40%. At 44 and 51 days of evaluation, the aqueous extract shows relative efficacy of 40 to 60%. The aqueous extract appears to have an effect on the larvae and oviposition of the weevil observed by efficacy at 44 and 51 days. Hydro alcoholic extracts, on the other hand, show greater control over adults with efficacy until the 7th date. Key words: Triticum aestivum L, storage, weevil, insecticidal action, Brazilian pepper