This paper settles the difference of contact action against females of Hylotrupes bajulus the likelihood of egg-laying, the ovicide effect and the hazards of development of newly hatched larvae between some preservatives belonging to three differents types: mineral waterborne products, organic products and emulsions. The results show that against females, the action is fast with organic products, slower with emulsions and non existent with mineral products. They point out the relation between the longivity of females and the eventuality of egg-laying. With ageing, this latter become possible for almost every preservative. In the most of cases, the larvae hatch from eggs and can bore into wood until they accumulate the lethal dosis and that occurs more or less fastly. A few differences are observed for preservatives of the same category.

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