Abstract
High percentages of Albugo Candida oospores from hypertrophied inflorescences of Brassica campestris were germinated by incubating them on moist filter paper for 21 days, by slowly leaching them for 15 days or more on sintered glass filters, or by washing them for a few days on a rotary shaker followed by a day of still-culture. Oospores germinated by the production of one or two simple or branched germ tubes, by release of zoospores from vesicles formed at the ends of germ tubes, and by release of zoospores from sessile vesicles. Germination by sessile vesicles was by far the most common. Forty-three percent of the oospores germinated in 4 days after dry storage for 21 years. The highest germination obtained in any sample was 88%. Seventy-one percent of the spores collected from the field in August germinated within 2 weeks. Good germination occurred at 10–20 °C.
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