The Tetranychus telarius Complex (Red and Green Forms) in Egyptian Cotton: Two Separate Species1

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Abstract
The 2 forms of tetranychid mites occurring on Egyptian cotton are presently designated the red and green forms of the Tetranychus telarius complex. Crossmating experiments with both forms were undertaken to demonstrate their interbreeding potential. These tests revealed intersterility between both forms, so that they can be regarded as separate species. Crosses between local populations from different parts of Egypt did not show reproductive isolation within either red or green species. Both show definite differences in their response to acaricides. The significance of these findings with regard to the gradation of both species in the course of 1 year is discussed.

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