none Research was carried out in 1993 and 1994 to test biological and integrated control strategies against aphids, Myzus persicae (Sulz.) in particular, and against the western flower thrips, Frankliniella occidentalis (Pergande), on some sweet pepper varieties, in protected cultivations. Aphidius colemani Viereck (Hymenoptera: Braconidae) and Orius laevigatus (Fieber) (Hemiptera: Anthocoridae) were used against M. persicae and F. occidentalis, respectively. Only in the second year, in relation to the infestation rate, biological control was integrated with chemicals. The behaviour of F-1 hybrids ("Valdor", "Laser" and "Inia" or "Ori") was compared. Data concerning the infestations were collected from leaf and flower samples and from blue traps of each plot. The best results were obtained for treated plots: up to 100% of parasitized aphids per leaf; infestation decrease of F. occidentalis up to 90%. "Ori" gave highest percentage of writhing fruits, "Laser" the greatest intensity of fruit damage. The degree of F. occidentalis damage never went over 5-10% of the fruit surface where integrated control was applied.