Average number of Polyphagotarsonemus latus females (+SEM) per plant, 3 weeks after introducing broad mites and predators simultaneously (1:20 means 40 females of P. latuswere introduced with 2 Amblyseius swirskii females; 1:10 means 20 P. latus females were introduced with 2 A. swirskii). Different letters indicate significant differences among treatments