A comparative study of monoterpenoids and phenylpropanoids from essential oils against stored grain insects: acute toxins or feeding deterrents

摘要: The relationship between the acute toxicity and feeding deterrent activity of ten compounds occurring commonly in essential oils was explored order to determine whether they are toxins or antifeedants against stored-grain pests. Simultaneously, objective also demonstrate comparative efficacy three post-harvest Thymol, carvacrol, eugenol trans-anethole were specifically toxic, linalool a generalist all species studied. Thymol most toxic Tribolium castaneum Rhyzopertha dominica compared carvacrol but least Sitophilus oryzae. Similarly, deterred S. oryzae (FI50 = 0.025 mg/g wafer diet), T. 0.207 diet) R. 0.482 at different concentrations; beetles required about 20 times concentration deter more than twice castaneum. Comparison with respective artificial blends as binary mixtures revealed that synergism not generalized phenomenon, variations both well blend specific. Individual compound correlations ascertained, which suggests could be prepared obtain potential for substantial control insect present study implies mostly toxins, whatever inhibition obtained due physiological rather any interaction gustatory receptors.