1991 Determination if a Rootstock More Tolerant of Nematodes, A Winter Cover Crop, or a Standard Chemical Treatment Will Improve Tree Growth and Protection in English Walnuts and Control Root Lesion Nematode (Pratylenchus Vulnus) Olson, Bill, Becky Westerdahl, Delbert Siemson, Mike Howard, Bill Stuke. 1991.
