The effect of post harvest treatment and the hump beetle , Gibbium psylloids (Zemp.), on the quality and quantity of dry chamomile flower heads was studied. Results, after storage period of two years, revealed that the glass jar packing received the lowest insect population, followed by plastic net then card box, while the highest insect population was observed in polyethylene bag. The highest weight loss of dry chamomile flower heads occurred in plastic net and the lowest in glass jar, at the end of the second year of storage. The essential oil percentage decreased by increasing the storage period in all experimental packages. Acid number decreased in all package except in polyethelene bag, which recorded an increase in acid number after two years storage.

Commercial oils of Pimpinella anisum L., Eucalyptus globulus L., Funiculum vulgare L. and Cuminum cyminum L. plants were tested at the concentration of 2.5 % on the 4 th instar larvae of Spodoptera littoralis. Feeding larvae on treated leaves with Pimpinella anisum and Eucalyptus globulus significantly reduced larval weight gained. There were no significant differences on fresh food consumption between all commercial oils tested and control; also between days and interaction between treatments and days. The results showed that all the tested commercial oils significantly reduced fresh weight of faeces. A 2.5 % concentration of Cuminum cyminum oil caused 50 % mortality, while the same concentration of Eucalyptus globulus oil caused 64.3 % malformation of the resulting pupae.All commercial oils treatments significantly reduced fecundity and fertility.Histobiological activity ofC. cyminum and / or E. globulus oil on the mid-gut of the treated larvae resulted in degrees of morphological abnormalities.