Abstract
Field trials for chemical control of potato seedpiece decay and blackleg, carried out in 1959, 1960, and 1961, revealed little or no benefit from seedpiece treatment when the cutting, treating, and planting operations were done the same day. However, if seed were cut and treated a month before planting, some detrimental and some beneficial results were obtained. Streptomycin (Agrimycin 100 or Phytomycin), used at 100 ppm, caused a reduction in stand and yield when used 30 days before planting. The percentage stand and the yield from pre-cut seed receiving no treatment were lower than those from non-treated seed cut at time of planting. Treatment of pre-cut seed with captan resulted in stands and yields equal to those obtained from any of the treatments of seed cut at time of planting. Treatment with streptomycin in combination with captan or dieldrin, or both, failed to offset the harmful effects of streptomycin on pre-cut seed. Treatment with dieldrin was neither beneficial nor harmful.
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