Technical Report
 

Fluoride investigations at the Mid-Columbia Experiment Station, 1961-1979

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  • Fruit set of sweet cherries was reduced if sprays containing fluoride (sodium or ammonium fluoride or hydrofluoric acid) were applied during anthesis. Sprays applied at other times during the fruit-growing season caused fruit and leaf symptoms, depending on the concentration of fluoride, but no reductions in fruit set. Symptoms of fluoride toxicity were blackening, shriveling, and "dimpling"; increased firmness of the stylar end of the fruit and marginal necrosis; interveinal chlorosis, cupping, reduced leaf size, and a loss of leaf tip. Similar responses were found, both with respect to fruit set and symptom expression, when sweet cherry limbs were enclosed in mylar cages and fumigated with gaseous hydrogen fluoride for varying periods of time at varying air fluoride concentrations. Fruit set reduction was linearly related to increasing dose of fluoride (expressed as hours exposure times concentration of fluoride in μg/m'). Germination of pollen and growth of pollen tubes were found to be inhibited by fluoride. Growth of fruit and vegetative tissues was influenced only at the higher levels of gaseous fluoride tested (4-6 )Ag/m') and generally after whole season treatment.
  • Published April 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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