Abstract
The numbers of conidia produced by Botrytis fabae on agar media increased up to the tenth day after inoculation, when the average age of conidia was 3 days. Germination in water of conidia from cultures differing in age between 10 and 40 days was equally high but those from cultures 25 and 35 days old were only 1/10 and 1/100 as infective as conidia from 10-day-old cultures. Suspending conidia from cultures up to 40 days old in a solution (0·2% or higher concn.) of either yeast extract or orange juice partially restored in-fectivity, as did solutions of sucrose, glucose, mannose and maltose, but fructose and galactose were less effective. Arabinose, xylose, casein hydrolysate, peptone and nucleic acid did not increase infectivity. Abrading leaves with ‘Celite’ before inoculation increased the numbers of infections produced by spores suspended in water; the increase, as with adding sugars, was greater with old than with young conidia.
Published Version
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