Abstract
Cultural characteristics were employed to develop a basis for characterizing each of the ten recognized races ofPhytophthora fragariaeHickman in the United States. Investigations were made into the relationships of temperature to growth and colony morphology, the effects of various media and s-sitosterol on growth and oospore production, and relative zoosporangium production capabilities of the ten races. On the basis of this information, the ten races were divided into two groups according to their colony morphologies. Further characterization was possible on the basis of differential oospore and zoosporangium production in different media, and, to a lesser extent, with contrasting increments in mycelial mass and linear extension.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
