Abstract
Conidium production byPeronospora farinosa f. sp.spinaciae (pathotype 3) was measured daily on colonies induced on leaves of spinach cvs Breedblad Scherpzaad (BS) and Huro. Distinction was made between colonies grown at temperatures of 10 and 15°C. Spore production was expressed as number of spores produced per stoma. There was a significant difference between total spore production on lesions on ‘BS’ at 10 °C and that on lesions on the three other cultivartemperature combinations tested. Also a significant difference in the average sporulation period was observed between lesions produced at 10 and those at 15 °C. The same significant difference in response to temperature was found in the sporulation per stoma in the course of time.
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