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Science 16 November 1979:
Vol. 206. no. 4420, pp. 839 - 841
DOI: 10.1126/science.206.4420.839
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Articles

Pierce's Disease Bacterium: Mechanism of Transmission by Leafhopper Vectors

ALEXANDER H. PURCELL 1, ALLAN H. FINLAY 1, and DONALD L. MCLEAN 2

1 Department of Entomological Sciences, University of California, Berkeley 94720
2 Department of Entomology, University of California, Davis 95616

The bacterium that causes Pierce's disease of grapevines is isolated most consistently from the foregut of its leafhopper vector Graphocephala atropunctata. As seen in light and scanning electron microscopy of infective leafhoppers, the bacteria are attached to the cibarial pump and the lining of the esophagus in the foregut where they appear to multiply. These findings suggest that the bacterium is transmitted from the foregut by egestion during feeding by infective leafloppers.

Submitted on June 5, 1979


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