Damage caused by the mite Tetranychus urticae (Trombidiformes: Tetranychidae) on three varieties of strawberry

We evaluated the tolerance of three newly developed Mexican strawberry varieties (CP0615, CPLE-7, and CPJacona) to the mite Tetranychus urticae, the most important pest of strawberry. We studied the effect of three different initial mite densities on population growth, duration of each developmental stage and survival of T. urticae on the three strawberry varieties. We also compared the area of leaf damaged as well as the density and morphology of trichomes . The largest final density of mites occurred on the variety CP0615, followed by the varieties CPLE-7 and CPJacona. There were no significant differences in the duration of T. urticae developmental stages amongst the varieties, except for larvae where the shortest duration was on variety CPLE-7. The proportion of eggs reaching the adult stage (survival) was significantly lower on the variety CPLE-7. The number and morphology of the trichomes did not play an important role in the outcomes, as they were similar in the three varieties. The area of leaf damaged in variety CPLE-7 was significantly smaller than for the other varieties. Based on these results, we believe that the variety CPLE-7 has the greatest potential for further development and eventually, for use on a commercial scale in Mexico.