“…Several PBR compounds, including paclobutrazol (El Hodairi and Canham, 1990), daminozide (Jones et al, 1989), triodobenzoic acid (Bukovac, 1968), NAA (Harley et al, 1958), and ethephon (ETH) (Williams, 1972) have enhanced flowering in apple trees the year following application. Several studies report enhanced flowering in bearing apple trees from foliar applications of ETH at concentrations ranging from 150 to 1000 mg•L -1 , with treatments varying by number of applications, application dates, and cultivars (Bukovac et al, 2006;McArtney et al, 2007;McArtney et al, 2013;Schmidt et al, 2009;Williams, F o r R e v i e w O n l y 1972). Similar results have been obtained with NAA at concentrations of 4 to 5 mg•L -1 , also with varying numbers of applications and application dates (McArtney et al, 2007;McArtney et al, 2013).…”