Abstract
Oospore production inVicia faba, cv. Metissa, was quantified in the field after plants had been inoculated with a sporangium suspension of a homothallic isolate ofPeronospora viciae f.sp.fabae. Oospores were produced abundantly during the hole growing season from 3 weeks after inoculation on. Oospores were found in all plant parts above soil level, except in the seeds. Most oospores were found in the leaves. Less oospores were formed in leaves inoculated in an older stage than in those inoculated in a younger stage. Towards the end of the season, in August, numbers of oospores in pods strongly increased.
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