INFLUENCE OF PRATYLENCHUS-PENETRANS ON INCIDENCE AND SEVERITY OF VERTICILLIUM WILT OF POTATO

  • 1 January 1978
    • journal article
    • research article
    • Vol. 10  (1) , 95-99
Abstract
The influence of P. penetrans on the incidence and severity of Verticillium wilt was examined in the potato [Solanum tuberosum] cv. Kennebec, Katahdin and Abnaki. Single-stem plants were grown in soil maintained at a temperature of 22 .+-. 1.degree. C. Axenically cultured nematodes were suspended in water and introduced to the soil at a rate of about 5000/25.4 cm pot, through holes made around each stem. Ten days after nematode infestation, conidial suspensions of V. albo-atrum were introduced into the soil at a rate of about 1,000,000/pot. Among ''Katahdin'' plants the severity of foliar symptoms was increased in the presence of both pathogens 2 and 3 wk after soil infestation. During the remaining 5 wk severity of foliar symptoms was not different between plants infected by both pathogens and those infected by Verticillium alone. Within silt-susceptible ''Kennebec'' and resistant ''Abnaki'' no effects on foliar symptom severity were observed. When plant heights, shoot wt and tuber yields were analyzed, a Pratylenchus-Verticillium interaction was not evident within any of the cultivars tested. Nematode populations in roots and rhizosphere were suppressed in ''Kennebec'' and ''Katahdin'' plants in the presence of Verticillium.

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