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A rapid filter paper dot-immunobinding assay was adapted to detect the wall-less mollicute Spiroplasma citri in medium, plants, or insects. Filter paper spotted with sample was incubated first in dilute antiserum, then in protein A-peroxidase, and finally in a substrate of 4-chloro-1-naphthol plus hydrogen peroxide. The detection limit averaged 2.3 x 1010 CFU/ml in cultures, and S. citri was detected in single infected leafhoppers. This assay was less sensitive but more rapid and economicaldoi:10.1128/aem.53.1.183-184.1987 fatcat:vi6fwhrwozcu5nksdzarrlejxi