Keh, B. (1952) Mating experiments with two-spotted spider mite complex. Journal of Economic Entomology, 45, 309-312.  Home/Search   Document Not in Database   Summary   Related Articles

....above in separating T. urticae and T. cinnabarinus in their study. In addition, they showed that T. urticae females have 10 setae on tibia I but T. cinnabarinus has 10 13 setae (addition of up to three solenidia) on tibia I. The difference in this fourth character was also noted earlier by Keh (1952), Boudreaux (1956) and van de Bund and Helle (1960) but ignored by subsequent authors (e.g. Dupont 1979; Mollet Sevacherian 1984; Meyer 1987) who questioned and debated the value of characters A C for separating the two species. The value of leg setation in the classification of the ....

....species, or at least a subspecies, derived from T. urticae and it may be hypothesized that the speciation is still in progress. The extent of speciation can be seen in many breeding experiments demonstrating complete reproduction isolation between the two or reduced fertility of hybrid offsprings (Keh 1952; Boudreaux 1956; Dillion 1958; Parr Hussey 1960; van de Bund Helle 1960; Monrae 1963; Jordaan 1977; Kuang Cheng 1990; P. Croft et al. personal communication, 2000) The experiments showing the lack of these reproductive barriers are the exceptions (i.e. Dupont 1979) rather than the usual. ....

Keh, B. (1952) Mating experiments with two-spotted spider mite complex. Journal of Economic Entomology, 45, 309-312.

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