by Merry — Be­cause it prefers to dine on some of our val­ued crop plants, the pea aphid (Acyrthosiphon pisum) is con­sid­ered a ma­jor pest — thus a Bad Guy from our per­spec­tive. Pea aphids are not with­out their en­e­mies. En­emy num­ber one is a par­a­sitoid wasp, Aphid­ius ervi. As par­a­sitoid wasps are used to do, fe­males pro­vide for their off­spring by...