Autumn Ehtrel Sprays on Peaches; Observations of Winter Hardiness and Bloom (2025)

Effects of ethephon application on bud and stems hardiness and bloom delay of "Redhaven" peach trees

Advances in horticultural science, 1989

Fall application of ethephon at 150 mgl-’ at the 10, 50, and 100% leaf drop stages delayed ‘Redhaven’ peach bloom by 8, 5, and 3 days, respectively, in 1987. At the 10% leaf drop stage, ethephon reduced flower and fruit number by almost half the amount produced by trees untreated or treated with ethephon at the 50 and 100% leaf drop stages. Fruit set was not affected by any of the ethephon treatments. Hardiness measured as percentage of bud survival was greater following the 50% leaf drop treatment through the dormancy period. Chemical name used: (2-chloroethyl) phosphonic acid (ethephon).

468 Effect of Hydrogen Cyanamide (Dormex) and Ethephon (Ethrel) on Fruiting of `Surecrop' Peaches

HortScience, 1999

Early flowering of peach in the southeastern United States can result in annual crop loss as a result of late winter-early spring freezes. In peach and other prunus, a fall application of ethephon delays flowering several days; however, delayed harvest and smaller fruit size of certain varieties may occur. Hydrogen cyanamide replaces the late stage of chilling in peach but can also advance bloom and harvest date while maintaing or enhancing fruit size. A randomized complete-block experimental design using 13-year old `Surecrop' trees was used to evaluate whether hydrogen cyanamide could offset the delayed harvest and smaller fruit size disadvantages of using ethephon without advancing bloom dates. Treatment combinations of ethephon (at 20%, 50%, and 90% of required chilling) and hydrogen cyanamide (at 90% to 100% of required chilling) were applied as whole-tree foliar sprays to near point of drip. Although not significant, there were trends toward hydrogen cyanamide overcoming b...

Ethylene-Mediated Modulation of Bud Phenology, Cold Hardiness, and Hormone Biosynthesis in Peach (Prunus persica)

Plants

Spring frosts exacerbated by global climate change have become a constant threat to temperate fruit production. Delaying the bloom date by plant growth regulators (PGRs) has been proposed as a practical frost avoidance strategy. Ethephon is an ethylene-releasing PGR found to delay bloom in several fruit species, yet its use is often coupled with harmful effects, limiting its applicability in commercial tree fruit production. Little information is available regarding the mechanisms by which ethephon influences blooming and bud dormancy. This study investigated the effects of fall-applied ethephon on bud phenology, cold hardiness, and hormonal balance throughout the bud dormancy cycle in peach. Our findings concluded that ethephon could alter several significant aspects of peach bud physiology, including accelerated leaf fall, extended chilling accumulation period, increased heat requirements, improved cold hardiness, and delayed bloom date. Ethephon effects on these traits were prima...

RESPUESTA DE ÁRBOLES DE DURAZNERO [Prunus persica (L.) Batsch] COMPUESTO DE DOS CULTIVARES EN UN AMBIENTE CON INCIDENCIA DE HELADAS: FLORACIÓN Y AMARRE DE FRUTO RESPONSE OF PEACH [Prunus persica (L.) Batsch] TREES COMPOSED BY TWO CULTIVARS IN AN ENVIRONMENT OF FROST INCIDENCE: BLOOM AND FRUIT SET

Agrociencia

Chemicals applied in fall and defoliation on dormancy evolution and release in low –chill peach ‘Flordaking’

Mild temperatures on bud breaking dormancy in peaches

Ciência Rural, 2009

Effect of sprinkler irrigation system on air temperatures and use of chemicals to protect cherry and peach trees from early spring frost

Australian Journal of Experimental Agriculture, 2006

The use of some chemicals including vitamins C and E, copper hydroxide, gibberellic acid, pinolene, urea, captan, ethephon, chlormequat chloride and paclobutrazol for early spring frost protection of cherry and peach trees was studied. Applications before frost of urea, copper hydroxide and a mix of glycerine or captan + vitamins C and E reduced the damage to flowers (at rates up to 40–60%), while application of gibberellic acid in combination with captan and pinoline 6 h after frost, reduced the damage by 40–50%. Ethephon delayed the bloom time of peach and cherry trees for about a week. Placing 2 sprinkler heads (200 L/h) on the tree at 40 or 280 cm height raised the temperatures 2.0 and 1.0–1.5°C, respectively.

The Effect of Some Methods Concerning the Prevention of Returning Frost and Hoarfrost on the Peach and Apricot Tree

Fruit Growing Research, 2022

Differential Thermal Analysis of ‘Elberta’ and ‘Flavorich’ Peach Flower Buds to Predict Cold Hardiness in Georgia

HortScience

Differential thermal analysis (DTA) has great potential as a quick and convenient cold hardiness determination method in plants. It measures freezing events inside of plant samples by detecting exotherm(s) produced when water changes from liquid to solid phase. DTA is highly sensitive to the experimental conditions and it has been reported to be ineffective among different fruit crops after acclimation of floral buds has occurred. The objective of this project was to establish DTA as a rapid and accurate method to predict peach floral bud cold hardiness from acclimation to deacclimation as compared with the traditional standard artificial freezing test. Floral buds of ‘Elberta’ and ‘Flavorich’ peach cultivars were subjected to DTA and artificial freezing tests throughout the winters of 2015–16 and 2016–17. Before deacclimation, two distinct exotherms, low-temperature exotherms (LTE) and high-temperature exotherms (HTE), were normally detected from floral bud DTA analyses. After deac...

Effects of a Combination Application of Hydrogen Cyanamid (Dormex) and Ethephon (Ethrel) on Fruiting of `Redhaven' and `Surecrop' Peach

HortScience, 1997

Early flowering of peach in the southeastern U.S. often results in some annual crop loss as a result of late winter–early spring freezes. It has been shown in peach and other prunus that a fall application of ethephon delays flowering 4 to 7 days and possibly affords increased bud hardiness. However, delayed harvest and smaller fruit size of certain varieties may occur. Hydrogen cyanamide replaces lack of chilling in peach, but can also advance harvest date and possibly enhance or maintain fruit size. A randomized complete-block experimental design was used to evaluate whether hydrogen cyanamide could offset the delayed harvest and smaller fruit size disadvantages of using ethephon without advancing bloom dates over a 3-year period. Treatment combinations of ethephon (at 20%, 50%, and 90% of required chilling) and hydrogen cyanamide (at 90% to 100% of required chilling) were applied as whole-tree foliar sprays to near point of drip. Results exhibited a possible trend toward hydrogen...