none The life-cycle of T. ampelophaga has been observed in 3 vineyards in Umbria (Central Italy) for 9 years (1976-1984) in the field and in the laboratory in order to compare the results of both. A summary is also given on world distribution, of this insect and in particular have been studied natural enemies and abiotic factors (meteorological and summer spraying), which are supposed to be dangerous to this insect. The results show the following: -the insect has only one generation per year and overwintering takes place in the bark of the vine and in stubs as larvae of second instar; - six species of parasites were found, that is 2 Chalcididae (Brachymeria intermedia Nees and Hocheria unicolor Walk.), 1 Braconidae (Apanteles ultor Reinh.), 2 Tachinidae (Zenilla libatrix (Panzer) and Exorista sp.) and 1 Trichogrammatidae (Trichogramma evanescens Westw.). The percentage of parasites is not very high so that they are not able to control the infestation of T. ampelophaga; - rainfalls, winds and high temperatures kill the pre-adult instar of T. ampelophaga but fungicide and insecticide commonly sprayed in summer are more dangerous for the insect than the previous ones.