Biosystematic Classification of Colladonus Ball Vectors of “Candidatus Phytoplasma Pruni” in the Pacific Northwest (Hemiptera: Cicadellidae: Deltocephalinae)

Résumé fourni par la source

A renewed outbreak of X-disease caused by “Candidatus Phytoplasma pruni” has led to substantial economic losses to the stone fruit industry of the Pacific Northwest, especially sweet cherry. Several leafhopper vectors transmit the pathogen, but Colladonus montanus reductus (Van Duzee) (Hemiptera: Auchenorrhyncha: Cicadellidae: Deltocephalinae) is the primary vector responsible for the current outbreak in Washington. Colladonus m. reductus is one of three subspecies of Colladonus montanus (Van Duzee), along with C. m. montanus (Van Duzee) and C. m. mulsus Ball. Historical reports on Colladonus vector biology are difficult to interpret in publications referring to C. montanus without subspecies identification. The last major revision for this genus published in 1957 acknowledged the need for further research to formally assess the specific classification of the C. montanus group. Our goal was to address the C. montanus species boundaries based on morphology, genotypes, and structure of the male vibrational communications. In this report, we support the elevation C. m. reductus as a separate species, C. reductus (Van Duzee), status reinstated. Colladonus reductus differs from C. montanus in morphology of the male pygofer, absence of a yellow wing spot, genotypes of the 16S, CO1, 18S, and 28S barcoding genes, and features of male vibrational communication signals. Biological observations of C. reductus and C. m. montanus are discussed, including geographical distributions and host plant use.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.