Stored products pest is refer to organism that infests and damages stored products found organic in nature included both plants and animals origin. Stored product pests are responsible for the severe loss of millions dollars every year through contaminated products, as well as for damage and destruction of important documents, household and heritage artifacts in offices, homes, museums, libraries and archives. Museum collections are severely vulnerable to pest infestation because much of the collection is composed of edible plant material cellulose or animal protein. The organic materials such as skin, leather, bone and parchment objects, form a substantial part of natural history collections of museums across the world, and are promptly infested by stored product pests like dermestid beetles, silver fishes, tenebrionides, clothes moths, psocids, cockroaches and other micro-organisms. In order to overcome the problems of biodeterioration, natural biocides should be taken in use. In this paper a comparative study has been shown between the toxicities of Myristica fragrans and Syzygium aromaticum oils with variation as contact and stomach poisons against the larvae of Anthrenus verbasci. Given an application rate in contact case of nutmeg oil LC 90 value is obtained at 19.11 whereas in stomach case LC 90 value is obtained at 16.62. other hand when used with clove oil in contact case LC 90 value is obtained at 8.97, whereas in stomach case LC 90 value is obtained at 4.59 which indicates use of clove oil in both cases of toxicity were much effective.
