Under constant darkness, they did not terminate diapause. Mites with their eyes intact terminated diapause under long days after low temperature exposure, whereas they remained in diapause under short days. ![]() urticae, their eyes were ablated using a laser ablation system. To investigate whether the eyes function as photoperiodic photoreceptors in T. Adult females of this species terminate diapause in response to long days. The two-spotted spider mite Tetranychus urticae possesses two pairs of eyes. In mites equipped with eyes, however, it is not known whether the retinal or extraretinal photoreceptors are involved in photoperiodism. Mites with no eyes have a clear photoperiodic response, suggesting the involvement of extraretinal photoreceptors in mite photoperiodism. ![]() Photoreceptors involved in photoperiodism in insects and mites can be either the retinal photoreceptors in the visual system or nonvisual extraretinal photoreceptors.
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