In the present investigation, eleven medicinal plants (spearmint. dill, red sorrel, common spearmint, margoramm, anise, cumin, parsely. sweet basil, warm seed plant and caraway) were evaluated as possible grain protectants. They were evaluated at 1%w/w, to wheat grains against infestation by Sitophilus oryzao L. and Rhizopenha dominica E The efficacy of these plants as powders were studied on adult mortality, F1 progeny, resultant weight loss (%) and damage (%). The results ob- tained showed that, the most effective powders against S. oryzao were margoram, anise. peppermint, dill and cumin while those of red sorrel, marjoram, anise and cumin were the most effective against R. dominica