Abstract
Tetranychus lintearius has been released in New Zealand as a biological control agent for gorse, Ulex europaeus, but before it could be introduced from Europe, it was necessary to show that this mite is reproductively isolated from closely related pest species. Crosses, reciprocal crosses were made between T. lintearius and 4 populations of T. urticae, and T. lintearius and one population of T. turkestani. In a 2nd experiment, males of a 2nd population of T. lintearius were crossed with females of 5 T. urticae populations. The sex ratio of F progeny in both experiments suggested that T. lintearius was reproductively isolated from other species, and could therefore be used as a biological control agent for gorse
