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United States Department of Agriculture

Agricultural Research Service

Title: Review of the Neotropical Leafhopper Genus Chlorogonalia (Hemiptera; Cicadellidae) with Notes on the Genus Caldwelliola.


Submitted to: Proceedings of the Entomological Society of Washington
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 13, 2004
Publication Date: June 30, 2005
Citation: Mckamey, S.H. 2005. Review of the neotropical leafhopper genus chlorogonalia (hemiptera; cicadellidae) with notes on the genus caldwelliola.. Proceedings of the Entomological Society of Washington. 108(3):611-618.

Interpretive Summary: Many plant diseases are spread by insects such as leafhoppers, causing hundreds of millions of dollars of crop loss annually worldwide. While investigating the identity of a likely vector of a bacterium which causes the "crespera" disease in coffee, it became apparent that two similar genera of leafhoppers required clearer delimitation. Four consistent differences were discovered to delimit the genera, and one species is transferred to the other genus as a result. An identification key is provided and the putative vector of the coffee disease is illustrated. This paper will be useful for APHIS, agricultural, and research workers interested in leafhopper systematics and the transmission of bacterial diseases of coffee.

Technical Abstract: Chlorogonalia Young 1977 and Caldwelliola Young 1977 are superficially very similar genera that may not be closely related. Two species, Chlorogonalia ultima Young and Caldwelliola reservata (Fowler) are particularly similar phenotypically and are sympatric in Ecuador (new country record for C. reservata). New diagnostic features are given for both genera and two of these features can be assessed in undissected specimens. Caldwelliola tharma Young is proposed as a new combination (from Chlorogonalia). Species of both genera are possible vectors of Xyella fastidiosa in coffee; Caldwelliola caucana has been directly implicated as a vector of the crespera disease in Colombia.

Last Modified: 4/22/2015