Summary
Incidence of potato scab was significantly reduced on a muck soil of high exchange capacity by PCNB with no reduction in tuber yield at rates up to 300 pounds per acre. Rates of 100, 200, and 300 pounds actual fungicide were used. Broadcast application followed by thorough mixing with the soil to a 6–8 inch depth proved satisfactory. Row application was not used in these tests.
At the higher rates residual activity was apparent the year following application. Repeated treatments the second year caused further significant scab decline. Accumulative reduction in scab incidence from a series of moderate yearly doses appears to be the most efficient use of PCNB on muck soil. This practice would be inconsistent with standard cropping methods used on muck, however, since potatoes are not ordinarily raised on the same muck soil in successive seasons. Economic considerations will be important in determining the exten of PCNB use and its acceptability among potato growers.
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Purdue University Agricultural Experiment Station Journal Paper No. 1294.
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Erickson, H.T. Potato scab control on organic soils. I. Initial response to PCNB. American Potato Journal 37, 18–22 (1960). https://doi.org/10.1007/BF02855587
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DOI: https://doi.org/10.1007/BF02855587