Abstract
Uredospores of bean rust (Uromyces phaseoli) were seeded at a range of dosages on plates of agar and the percentage germination and length of germ tubes determined after 24 hours. As the spore dosage was increased from about 0.2 to 160 spores per mm3 of plain agar the percentage germination de-creased from about 90 percent to 0, while for the same increase in spore dosage the length of germ tubes increased from about 350 [mu] to 600 [mu].

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