Abstract
THE homothallic oomycete Phytophthora cactorum is frequently grown on oatmeal agar1, and on this medium it forms oospores readily. On a basal medium of sucrose or glucose, asparagine, mineral salts and thiamine its vegetative growth is less and oospores are not formed, or a very few are found after a long time, and then only at the edge of the colony. The basal medium evidently lacks some growth factor or factors present in oats. The addition of aqueous extracts of ground oat grains to the basal medium stimulates vegetative growth but does not lead to the production of oospores. However, the addition of 500 mg/l. of a petroleum ether or ethanol extract of oats both increases the rate and amount of growth and results in the production of oospores. Aqueous and ethanol extracts of peas have similar effects.
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