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Ethrel [(2chloroethyl)phosphonic acid] was applied at 0, 100 or 200 ppm (mg·L–1) for 3 years to the early maturing ‘Empress’ peach [Prunus persica (L.) Batsch] to determine if bloom delay by Ethrel reduces fruit weight at harvest. Trees were hand thinned at 0 or 3 weeks after full bloom to equalize cropload across Ethrel treatments and to determine if any reduction in fruit weight by Ethrel can be compensated by harvest with earlier thinning. Ethrel at 200 ppm (mg·L–1) delayed bloom by 3, 0, and 7 days in 1994, 1996 and 1997, respectively. Despite bloom delay, Ethrel did not delay harvest or reduce fruit weight. Thus, earlier hand thinning was not necessary. Ethrel did not affect blossom density and was not phytotoxic to vegetative or reproductive organs. These results indicate that even with the shorter fruit growth period of early maturing peach cultivars such as ‘Empress’, there is sufficient time for fruit growth to recover on Ethrel treated trees so that fruit weight at harvest is not reduced.

Effect of Ethrel on Bloom Delay, Harvest Date, and Fruit Weight of `Empress' Peach