Summary
Spraying potato plants with dilute concentrations of a-naphthal-eneacetamide was not effective in increasing flower or seed ball production in the greenhouse at Beltsville Maryland, or Greeley, Colorado. Higher concentrations reduced flower production at Presque Isle, Maine.
Sebago and Irish Cobbler produced more seed balls at Greeley than at Beltsville. Less cloudy weather at Greeley during the winter months is probably the chief factor responsible for this result.
S 245–25, when self-pollinated, produced as many seed balls at Beltsville as at Greeley. It appears that this variety flowers and sets seed more readily under fairly unfavorable light conditions than either Sebago or Irish Cobbler.
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Clarke, A.E., Edmundson, W.C. & Lombard, P.M. Seed-setting in potatoes as affected by spraying with a-naphthaleneacetamide and by light. American Potato Journal 18, 273–279 (1941). https://doi.org/10.1007/BF02895492
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DOI: https://doi.org/10.1007/BF02895492