The interaction of Pratylenchus penetrans and Verticillium dahliae for symptom expression of potato early dying and yield and quality of tubers of Russet Burbank potato was evaluated in microplots and field plots. Soil was fumigated with metham sodium before being infested with varying population levels of the nematode and/or fungus. In the microplot study, low and high initial populations of P. penetrans (about 25 and 75/100 cm 3 of soil) or V. dahliae (about 3 and 9 colony-forming units/g of dry soil) had no effect on number and fresh weight of tubers compared to the control (...)
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Ann E. MacGuidwin (1990) studied this question.