Chemical Composition and Bioactivity of Essential Oils of Croton blanchetianus Bailland and Sida cordifolia L. on Callosobruchus maculatus (Fabr., 1775)

This study aimed to evaluate the yield and chemical composition of essential oils from Croton blanchetianus Sida cordifolia, in addition investigating insecticidal potential these on adults bean weevil, Callosobruchus maculatus. To obtain oils, hydrodistillation method was adopted, using a Clevenger apparatus. The identification quantification constituents performed by means gas chromatography coupled mass spectrometry (GC-MS). For each oil, fumigation bioassays were C. Macullatus six concentrations, 0; 0,30; 0,48; 0,60 e 0,70 (µL/750 mL) for Blanchetianus. As oil S. concentrations applied 0, 3, 6, 9, 12 15 (µg/750 mL). carried out under constant conditions temperature (25 ± 2ºC) relative humidity (60% 10%). In tests, different strips filter paper (2x3 cm) attached bottom lid glass container (750mL), which contained 10 grams cowpea unsexed adult insects. Insect mortality evaluated 48 hours after treatments applied. Data submitted analysis variance regression analysis. When possible, lethal doses calculated 50 95% test population (LD50 LD95). blanchtianus 0.50%, higher than that obtained S.cordifolia, 0.03%. species blanchetianus, 20 components identified, with monoterpene eucalyptol being major compound (32.89%). sesquiterpene spathulenol (31.76%). bioassays, considerable activity observed maculatus adults, relatively low doses. used caused maximum 5.3% mortality, it not possible determine LD50 90 this species.