Tergitol TMN-6 for Thinning Peach Blossoms

Wilkins, Bryan; Ebel, Robert C.; Dozier, W. A.; Pitts, James Albert; Boozer, Robert T.

doi:10.21273/hortsci.39.7.1611

Cited by 9 publications

(10 citation statements)

References 11 publications

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“…Three years of research on chemical blossom thinners demonstrated that although the treatments often increased peach fruit size, they were inconsistent in reducing follow-up hand thinning requirement. These results are similar to reports from other peach producing regions (Byers, 1999;Fallahi et al, 2006;Klein and Cohen, 2000;Osborne et al, 2005;Wilkins et al, 2004).…”

supporting

confidence: 91%

Mechanical String Thinner Reduces Crop Load at Variable Stages of Bloom Development of Peach and Nectarine Trees

Baugher¹,

Ellis²,

Remcheck³

et al. 2010

horts

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Thinning of blossoms or fruitlets is a labor-intensive requirement in the production of peach and nectarine (Prunus persica) fruit of optimum size and quality. Prior research conducted by the authors on string blossom thinners for managing peach tree crop load demonstrated that this new technology reduces labor requirement and improves fruit size. The research reported in the current article was conducted over 2 years on ‘Sugar Giant’ peach and ‘Arctic Sweet’ nectarine to evaluate string blossom thinner efficacy at variable stages of bloom development ranging from pink to petal fall. Blossom removal at the pink stage of bloom development was lower than at other stages in 2008; however, a 150-rpm versus 120-rpm spindle rotation speed resulted in blossom removal similar to the 80% full bloom (FB) treatment in 2009. Blossom removal at the petal fall stage was similar to the open bloom stage with the exception of the 2009 ‘Sugar Giant’ trial, in which blossom removal was higher at 80% FB. Flower density and fruit set of the bloom stage compared with hand-thinned control treatments followed a similar trend with the exception that there were fewer differences in 2009 and in lower canopy regions. Follow-up hand thinning time was reduced by all string thinning/year combinations except ‘Arctic Sweet’ at pink in 2008 and 2009 and at petal fall in 2009. The best treatments reduced follow-up hand thinning time compared with green fruit hand thinning alone by 51% and 41% for ‘Sugar Giant’ and by 42% and 22% for ‘Arctic Sweet’ in Years 1 and 2, respectively. In 2008, the percentage of fruit in the “7.0 cm or greater” size category was increased by all bloom stage treatments in both cultivars. The 2009 size distribution of ‘Arctic Sweet’ fruit was unaffected, but the percentage of ‘Sugar Giant’ fruit in higher market value size categories was increased by the 80% FB and higher rpm pink treatments. Savings in hand thinning time and/or increases in fruit size in both years associated with the bloom stage treatments resulted in a net positive impact of $123/ha to 1368/ha compared with hand thinning alone.

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supporting

confidence: 91%

Mechanical String Thinner Reduces Crop Load at Variable Stages of Bloom Development of Peach and Nectarine Trees

Baugher¹,

Ellis²,

Remcheck³

et al. 2010

horts

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“…Fallahi et al [13] reported that Tergitol TMN-6 at the rate of 5 mL•L −1 , applied at 75% to 85% bloom, reduced fruit set in peaches under conditions of southern Idaho, USA. Wilkins et al [14] reported that Tergitol TMN-6 effectively reduced fruit set in "Fireprince" peach under climatic conditions of Clanton, Alabama. In that report, there was no difference in thinning response at full bloom or petal fall, suggesting a wide window of efficacy for this chemical.…”

Section: Introductionmentioning

confidence: 99%

Branched Secondary Alcohol Ethoxylate, Ammonium Thiosulfate, Calcium Polysulfides-Thiosulfate, and Fish Oil Effects on Blossom Thinning, Fruit Set and Quality of Peaches and Nectarines

Fallahi¹,

Khoddamzadeh²,

Fallahi³

et al. 2020

AJPS

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“…The surfactant, Tergitol-TMN-6, significantly reduced fruit set and increased fruit size in 'Empress' plums at various rates (7.5 and 12.5 mL · L -1 ) (Fallahi et al, 2006). Tergitol-TMN-6 is effective over a wide range of phenological stages from full bloom to petal fall, which allows for a longer window of application (Wilkins et al, 2004). The current recommendation for stone fruit is to apply Tergitol-TMN-6 at 75% to 80% full bloom at 7.5-12.5 mL · L -1 (Fallahi et al, 2006), but in South Africa, blossom thinners have not been very successful.…”

mentioning

confidence: 99%

Efficacy of ACC (1-aminocyclopropane-1-carboxylic acid) as a Chemical Thinner Alone or Combined with Mechanical Thinning for Japanese Plums (Prunus salacina)

Theron¹,

Steenkamp²,

Steyn³

2017

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Thinning is a labor-intensive and expensive, but important practice in japanese plum production requiring new thinning strategies. The purpose of this study was to evaluate a new chemical thinner 1-aminocyclopropane-1-carboxylic acid (ACC) on ‘Laetitia’, ‘Fortune’, and ‘African Rose™’. ACC was also combined with 6-benzyl adenine (6-BA) and in one season on ‘African Rose™’ with mechanical thinning using the Darwin 300™ or hand thinning during bloom. All the foliar applications were made when the average fruitlet diameter was 7–10 mm using a spray volume of 1000 L·ha−1 under slow drying conditions. Significant thinning effects were found in all the trials conducted over the two seasons. ACC consistently reduced the hand-thinning requirement at commercial hand thinning in both seasons in ‘African Rose™’. In the second season there was a linear decrease in yield and an increase in fruit size as the ACC rate increased from the low to medium rate before flattening off. The combination treatment of ACC and the Darwin 300™ used in the ‘African Rose™’ trial thinned more aggressively, improved fruit size and shifted harvest earlier. The yield however was not lower than that of the control treatment. 6-BA was included in all trials to prevent ACC-induced leaf drop, and generally did not thin fruitlets, except in the case of ‘Laetitia’ where the combination with ACC resulted in stronger thinning. Cultivars differed in their sensitivity to ACC and the rate for each cultivar should be determined separately. The recommended ACC rate for ‘African Rose™’ would be 600 µL·L−1 and for ‘Laetitia’ 400 µL·L−1. For ‘Fortune’ a rate recommendation is not possible at this stage, thus further trials should be conducted. No broken stones were observed in fruit in any trial. Also, no leaf drop/phytotoxicity was recorded in any trial when ACC was applied during cool, slow-drying conditions.

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Tergitol TMN-6 for Thinning Peach Blossoms

Cited by 9 publications

References 11 publications

Mechanical String Thinner Reduces Crop Load at Variable Stages of Bloom Development of Peach and Nectarine Trees

Mechanical String Thinner Reduces Crop Load at Variable Stages of Bloom Development of Peach and Nectarine Trees

Branched Secondary Alcohol Ethoxylate, Ammonium Thiosulfate, Calcium Polysulfides-Thiosulfate, and Fish Oil Effects on Blossom Thinning, Fruit Set and Quality of Peaches and Nectarines

Efficacy of ACC (1-aminocyclopropane-1-carboxylic acid) as a Chemical Thinner Alone or Combined with Mechanical Thinning for Japanese Plums (Prunus salacina)

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