Laboratory and field experiments were conducted to study the effect of UV filtration on the population growth, distribution and flight activity of the green peach aphid Myzus persicae (Sulzer) (Homoptera: Aphididae), and on the fecundity and host-finding behavior of the parasitic wasp Aphidius matricariae (Haliday) (Hymenoptera: Braconidae). The work was done in the Arava Valley of Israel, in walk-in tunnels covered with polyethylene film, to compare the effects of UV-absorbing film versus those of regular film. Following artificial aphid infestation on pepper grown under the tested films, aphid population growth and spread under the UV-absorbing films were significantly less than under the regular films. The greatest impact of UV-absorbing film on aphid behavior was observed in winter and early spring, when temperature conditions favour aphid development. Elimination of UV by UV absorbing film did not affect the parasitic activity of A. matricariae. Previous results had indicated that covering the greenhouse with UV-absorbing films inhibited the invasion of aphids and other insect pests into it. That effect, in combination with those described in the present paper, makes the use of UV-absorbing films an effective component of IPM that aims to reduce the application of toxic insecticides. Reproduction; Reproductive productivity; Behaviour; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Abiotic factors; Physical factors; Land zones; Palaearctic region; Eurasia; Asia Aphidius matricariae (Aphidiidae); Fecundity; Hemipteran hosts; Myzus persicae; Light; UV filtration; Fecundity & hemipteran host finding behaviour effects; Israel; Arava Valley; UV light filtration effect on hemipteran host finding behaviour & fecundity Myzus persicae (Aphidoidea); Activity patterns; Flight activity; Hymenopteran parasites; Aphidius matricariae; Host finding behaviour of parasite, effects of UV filtration; Population dynamics; Population growth; Light; UV filtration; Population growth & flight activity effects; Temperature; Israel; Arava Valley; UV light filtration effect on population growth & flight activity none