“…The biological-control agents and pest species used in the activities are diverse despite the low number of published activities. The articles used insect predators and parasitoids to control insects (Geoghegan, 2000;D'Avanzo & Musante, 2004;Richardson & Hari, 2009), herbivorous insects to control plants (Schutzenhofer & Knight, 2009), wolves to control elk (Dott, 2009), host-plant resistance against insects (Palevitz et al, 2002;Zycherman & Taylor, 2004), host-plant resistance against pathogens (Goetsch et al, 2002), repellency of neighboring plants to insects (Eason & LaManna, 2000), biopesticides (Stalter et al, 2000) or pathogenic fungi to control insects (Chanchaichaovivat et al, 2008), and two focused on the biological control of plants and insects without mentioning the control agent (Haefner et al, 2006;Buczynski, 2007).…”