Occurrence ofCylindrocladium crotalariaeon Peanut (Arachis hypogaea) Seed

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Abstract
Propagules of C. crotalariae, cause of Cylindrocladium black rot (CBR) of peanuts, were detected in samples of sound peanut kernels from two sites at Tolga, Queensland [Australia]. Samples were taken from mechanically harvested pods in storage as well as from gleanings collected from the field up to 8 wk after harvest. Propagules were detected on sucrose-QT agar after sieving (mesh sizes 36 and 63 .mu.m) aqueous washings from kernel samples. Low numbers of propagules (1-80/kg of kernels) were recorded on seed-quality kernels from storage bins; much higher counts were obtained from field gleanings. Seed transport is implicated in the spread of CBR to unaffected areas and should be considered during selection of peanut seed crops and postentry quarantine treatment of imported peanut lines.

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