. FiGUBE 5. The causa] fungus, Peronospora tabacina. A. A single spoorphore showing young summer spores in several stages of development. Most of the spores have already fallen off the tips of the branches. B. Mature summer spores (sporangia or conidia). C. Germination of the summer spores in var- ious stages from one to fom- hours in a drop of water. D. An oospore (winter spore) from the interior of a dead leaf. (Magnified, 400 times natural size.)

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