Consumption of nuclear polyhedrosis virus-infected prey—larvae of the soybean looper,Pseudoplusia includens(Walker)—by the predatorNabis roseipennisReuter variously affected development, survival, and reproduction of the predators. Nymphs fed infected prey larvae developed significantly faster at 25°C than nymphs fed uninfected prey. Nymphal survival was not affected by prey infection. Preoviposition periods were significantly longer for predator females maintained on infected prey throughout their lives than for those receiving uninfected prey during preimaginal or adult (or both) stages. Daily rates of oviposition were highest for females that received uninfected larvae as their nymphal diet, regardless of adult diet. In contrast, total fecundity was greatest for females receiving uninfected prey as adults, regardless of the nymphal diet. The nymphal diet, however, affected total fecundity of females. Consumption of infected larvae by adult predators significantly reduced their longevity, irrespective of the nymphal regimen.