Summary
Inoculation of field-grown Russet Burbank potatoes with leafroll virus during late June and early July resulted in nearly twice as many infected plants and four times as many infected tubers as inoculations made in late August. A marked decrease in infection consistently occurred during the time of bud formation and flowering.
Slightly more leafroll was detected at Aberdeen, Idaho than at Oceanside, California (location of certified seed winter test plot) when duplicate seed pieces from index tubers were planted at the respective locations. There was a tendency for plants producd from tuber projeny of late-season inoculations to be undetected more often than plants produced from tuber progency of early-season inoculations.
By indexing one tuber from each hill, thirty-five percent of the total number of infected plants was missed. The relatively larger tubers, in partially infected hills, were infected more often than smaller tubers.
An improved clip-type leaf cage is described.
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Submitted with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 602.
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Knutson, K.W., Bishop, G.W. Potato leafroll virus — Effect of date of inoculation on percent infection and symptom expression. American Potato Journal 41, 227–238 (1964). https://doi.org/10.1007/BF02855152
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DOI: https://doi.org/10.1007/BF02855152