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Notes on the penetration phenomena and haustorium formation in Peronospora brassieae Gaum.



Notes on the penetration phenomena and haustorium formation in Peronospora brassieae Gaum.



Ann. phytopath. Soc, Japan 5(2): 150-157



In inoculation experiments on eight kinds of crucifers with the conidia of Peronospora brassieae, the germ-tube was consistently observed to penetrate the epidermis through the boundary between two cells and not by way of the stomata. In a moist chamber at about 15 degrees C. conidia placed on leaves germinate in four to six hours, appressoria are formed in twelve, and infection hyphae in 18 to 24 hours.

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