Fumigations with hydrogen fluoride (HF) decreased in vivo pollen tube growth of ‘Tilton’ apricot ( Prunus armeniaca L.). Both tube lengths and percent of styles with pollen tubes that reached the base of the style were adversely affected more by high HF concentration for a short time than by low concentration for a longer time. Pollen germination was unaffected on agar containing sodium fluoride. Fumigations with hydrogen chloride had no effect on pollen tube growth at concentrations from 0.05 to 0.75 mg Cl/m 3 and durations of exposure from 8.5 to 72 hours.
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Facteau et al. (1977) studied this question.