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Red Pontiac vine and tuber yields as affected by virus X

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Summary

Red Pontiac tubers from 40 different midwestern sources were indexed to determine what strain or strains of virus X were present.

A moderate strain of the virus was found to be commonly present.

No distinct X-virus symptoms were observed in greenhouse-grown plants except for the periodic appearance of a faint leaf mottle, most easily detected on cloudy days.

When grown outdoors, the leaves of Red Pontiac plants infected with the moderate strain had a slight upward, lateral roll and were slightly wrinkled. The infected leaves were not as dark green in color as virus-free leaves.

The mean replicate weight of the X-free vines was 25.43 pounds compared to 17.41 for the infected plants; a highly significant difference of 31.54%.

The mean replicate weight of the X-free tubers was 37.02 pounds compared to 28.93 for those infected with the virus. The difference of 8.09 pounds was highly significant and represented a 21.85% reduction in total yield.

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Authors and Affiliations

  1. Crops Research Division, Agricultural Research Service, United States Department of Agriculture, Irrigation Experiment Station, Prosser, Washington

    Wm. G. Hoyman (Plant Pathologist)

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  1. Wm. G. Hoyman
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Hoyman, W.G. Red Pontiac vine and tuber yields as affected by virus X. American Potato Journal 41, 208–211 (1964). https://doi.org/10.1007/BF02855085

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  • DOI: https://doi.org/10.1007/BF02855085

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