1972 Relationship of Cultivation or Cover Crop to Lesson Nematode Population Sibbett, G.S. and D.E. Johnson. 1972.
1994 Will Launching a Winter Cover Crop, or a Standard Chemical Treatment Will Improve Tree Growth and Production in English Walnuts and/or Control Root Lesion Nematode (Pratylenchus Vulnus) Olson, Bill, Becky Westerdahl. 1994.
1990 Determinations if a Rootstock More Tolerant of Nematodes, a Winter Cover Crop, or a Standard Chemical Treatment will improve Tree Growth and Production in English Walnuts and Control Root Lesion Nematode Pratylenchus Vulnus Olson, Bill, Becky Westerdahl. 1990.