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

Abstract

The objective of this study is to evaluate the efficacy of Schinus terebinthifolius ext. in controlling the insects of stored wheat. The exptl. design was completely randomized with 10 replicates in a factorial scheme of 4 × 9, for exts. (control, aq. ext., and hydro alc. ext. 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 exts. Up to the first nine days of storage, the hydro alc. ext. (15%) has a relative efficacy of 35%. At 9 and 16 days of evaluation, hydro alc. exts. (5 and 15%) presented relative efficacy of 40%. At 44 and 51 days of evaluation, the aq. ext. shows relative efficacy of 40 to 60%. The aq. ext. appears to have an effect on the larvae and oviposition of the weevil obsd. by efficacy at 44 and 51 days. Hydro alc. exts., on the other hand, show greater control over adults with efficacy until the 7th date. [on SciFinder(R)]