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We studied species diversity and genetic variation among populations of  Brevipalpus  mites from four species of citrus host plants. We sampled mites on orange, lime, grapefruit and mandarin trees from orchards at six localities distributed in the five most important citrus producing states in Mexico. Genetic variation among citrus host plants and localities were assessed by analysis of nucleotide sequence data from fragments of the mitochondrial cytochrome oxidase subunit I (COI). Both  Brevipalpus yothersi  and  B .  californicus  were found at these sites, and  B .  yothersi  was the most abundant species found on all citrus species and in all localities sampled.  B .  californicus  was found mainly on orange and mandarin and only in two of the states sampled. AMOVA and haplotype network analyses revealed no correlation between  B .  yothersi  genetic population structure and geographical origin or citrus host plant species. Considering that a previous study reported greater genetic diversity in  B .  yothersi  populations from Brazil than we observed in Mexico, we discuss the possibility that the Mexican populations may have originated in the southern region of America.

Analysis of Genetic Variation in Brevipalpus yothersi (Acari: Tenuipalpidae) Populations from Four Species of Citrus Host Plants