A comparison was made of various techniques for isolating Pyrenochaeta terrestris (Hansen) Gorenz et al. from growing onion roots. Water agar was as suitable as potato dextrose agar (0.5% dextrose) and is recommended to avoid contamination. Texas L 303, Iowa Yellow Globe 51, and Trapp's Downing Yellow Globe used as trap crops were equally efficient. Maximum infection of the early planting occurred earlier than a later planting.
Proceedings of the Iowa Academy of Science
©1961 Iowa Academy of Science, Inc.
Borgman, Robert P. and Horton, J. C.
"Isolation of Pyrenochaeta terrestris from Onion Roots,"
Proceedings of the Iowa Academy of Science, 68(1), 103-105.
Available at: https://scholarworks.uni.edu/pias/vol68/iss1/15