Bonato Olivier auteur aut IRD Deschamps C. auteur aut IRD Hamdi F. auteur aut IRD Ridray G. auteur aut IRD Chadoeuf J. auteur aut IRD text journalArticle eng text/pdf born digital access The characteristics of the generalist predator Macrolophus caliginosus made it the main actor in the biological control of Trialeurodes vaporariorum in protected tomato crops; but its action on Bemisia tabaci remains unclear. Because B tabaci does not belong to the natural host spectrum of M caliginosus, the feeding foraging behaviour of the predator is questioned when B tabaci is the only prey available. The movements of M caliginosus and its aggregation on B tabaci populations were studied in real conditions of production in two greenhouses equipped with insect-proof nets. Macrolophus caliginosus was first introduced on the crop. Five weeks later, 4 focus (per greenhouse) of B tabaci infestation were generated. In the absence of B tacaci, the M caliginosus population colonized the whole greenhouse and succeeded in maintaining equal larval density for two generations. The density of predator presents on plants infested by B tabaci was significantly higher than the one measured on the other plants. The presence of prey on plants infested with B tabaci probably decreased the intrinsic mortality of predator larvae and enhanced oviposition of adults thereby enhancing their fitness due to feeding. specialized Macrolophus caliginosus (Wagner 1951) Bemisia tabaci density dispersal distribution predation 076 33 1-2 91-102 2011 0171-8177 https://www.documentation.ird.fr/hor/fdi:010053705 0171-8177 [F B010053705] https://www.documentation.ird.fr/hor/fdi:010053705 https://www.documentation.ird.fr/intranet/publi/2011/08/010053705.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-09-01 2017-08-23 fdi:010053705 fre