Brevis thinning efficacy at different fruit size and fluorescence on ‘Gala’ and ‘Fuji’ apples

González, Luis Alonso; Bonany, J.; Alegre, Simó; Àvila, Glòria; Carbó, Joaquim; Torres, Estanis; Recasens, I.; Martín, B.; Asín, L.

doi:10.1016/j.scienta.2019.05.053

Cited by 8 publications

(15 citation statements)

References 28 publications

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“…In this study, differences between years were observed, which concurs with the observations of Brunner 2014and Gonzalez et al (2019b), who argued that the same amounts of metamitron applied in different years might not always reduce final fruit set to the same extent. In this respect, the results of this study also concur with those of previous studies made by Robinson and Lakso (2004) and Robinson et al (2016) with naphthaleneacetic acid (NAA), 6-benzyladenine (BA) and carbaryl, which reported significant variation in chemical thinning efficacy from year to year and within year.…”

supporting

confidence: 92%

“…The estimated parameters A, α and B were related with final fruit set, however the period of inhibition has to be finished before prediction can be made of Brevis ® efficacy in the year. Moreover, in trials performed by Gonzalez et al (2019b) with applications at different fruit size, these parameters were not related with final fruit set. With these results, the parameters can be related with crop load when the applications are made at the same time and at different doses.…”

mentioning

confidence: 81%

“…These parameters represent from the time of application to the time of minimum Qy(%) value, which is the time of maximum inhibition ( Fig. 1) (Gonzalez et al, 2019b). The parameters A and α explain the recuperation of Qy, representing from the time of maximum inhibition, Qy(%) minimum value to the end of the period of inhibition caused by Brevis ® (Fig.…”

Section: Biexponential Functionsmentioning

confidence: 99%

“…The area under the curve (AUC) is the area in the 20 days after application ( Fig. 1) (Gonzalez et al, 2019b). Table 1 shows the calculations of the parameters.…”

Section: Biexponential Functionsmentioning

confidence: 99%

“…Finally, chemical thinning is a commonly used practice because it acts early on the fruit and reduces production costs. However, its efficacy is variable as its use is dependent on climatic conditions and cultivar (Byers, 2003;Gonzalez et al, 2019b;Lordan et al, 2018;Robinson and Lakso, 2004). Currently, in Spain, chemical thinning can be carried out during flowering (naphthalene acetamide (NAD)) and after fruit set on young fruitlets at the 6-16 mm stages (using the hormones 6-benzyladenine (BA) and naphthyl acetic acid (NAA)).…”

Section: Introductionmentioning

confidence: 99%

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Effect of different application rates of metamitron as fruitlet chemical thinner on thinning efficacy and fluorescence inhibition in Gala and Fuji apple

González¹,

Torres²,

Carbó

et al. 2019

Plant Growth Regul

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Crop thinning is an important and difficult agricultural practice. Knowing the effect of the application dose of a product is a crucial element of any thinning program. The aims of this study were to investigate the effect of different metamitron doses on Gala and Fuji apples applied at fruit king diameters of between 8 and 10 mm and to determine fluorescence inhibition at the different application rates. Trials were conducted over two seasons from 2015 to 2016 in apple orchards in Lleida (Spain). Photosynthesis inhibition caused by metamitron was also analysed and measured, using chlorophyll fluorescence and biexponential pharmacokinetic models. Under the trial conditions, the application of metamitron reduced final fruit set, number of fruits per tree and crop load depending on the application rate. A dose effect was observed in all yield parameters. Moreover, when metamitron showed high efficacy, there was an improvement in fruit weight, coloration and diameter. The estimated parameters A, α and B using a biexponential equation were related with final fruit set, however the period of inhibition has to be finished before prediction can be made of metamitron efficacy in the year. The fluorescence analysis showed a dose effect, with metamitron dose increasing inhibition. Additionally, the same result was also observed in the area under curve analysis, with metamitron dose reducing the area and inhibition increasing. In all yield parameters, the fluorescence and area under curve analyses showed differences between cultivars, with the inhibition caused by metamitron higher in Gala than in Fuji. Moreover, differences between years were observed. 2015 was warmer than 2016, and the higher temperatures increased the thinning efficacy of metamitron.

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supporting

confidence: 92%

mentioning

confidence: 81%

Section: Biexponential Functionsmentioning

confidence: 99%

“…The area under the curve (AUC) is the area in the 20 days after application ( Fig. 1) (Gonzalez et al, 2019b). Table 1 shows the calculations of the parameters.…”

Section: Biexponential Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of different application rates of metamitron as fruitlet chemical thinner on thinning efficacy and fluorescence inhibition in Gala and Fuji apple

González¹,

Torres²,

Carbó

et al. 2019

Plant Growth Regul

Self Cite

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Effect of thinning with metamitron, NAA, BA and naphthenic acids on apple (Malus domestica) trees

González

Torres²,

Àvila

et al. 2023

Plant Growth Regul

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Evaluation of chemical fruit thinning efficiency using Brevis® (Metamitron) on apple trees (‘Gala’) under Spanish conditions

González¹,

Torres²,

Àvila

et al. 2020

Scientia Horticulturae

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Thinning is an important technique in apple growing which is used to reduce the number of fruits per plant and achieve commercial fruit size and quality. The objective of this work was to evaluate the efficacy of one and two applications of the chemical thinner Brevis in Gala apple applied at different fruit sizes and at different intervals between the first and second spray. The trials were conducted over two seasons from 2015 to 2016 in apple orchards of the IRTA experimental agricultural stations of Mas Badia and Lleida (Spain).One or two applications with Brevis were applied at different fruit sizes (king fruit diameter ranging between 7.5 and 13.5 mm) and at a rate of 1.65 kg/ha for all treatments. Under the trial conditions, a Brevis thinning effect was observed in all trials with a reduction in crop load, fruit set and number of fruits per tree which varied according to the number of applications. In addition, average fruit weight, color and diameter increased significantly with treatments in which Brevis reduced the number of fruits per tree. The degree of abscission of Brevis was highly dependent on night temperature and, for this reason, there was a high degree of variability between trials in terms of efficacy. Our results show that the number of days between applications was not as important a factor for Brevis efficacy as the difference in night temperature in the days immediately after its application.

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Brevis thinning efficacy at different fruit size and fluorescence on ‘Gala’ and ‘Fuji’ apples

Cited by 8 publications

References 28 publications

Effect of different application rates of metamitron as fruitlet chemical thinner on thinning efficacy and fluorescence inhibition in Gala and Fuji apple

Effect of different application rates of metamitron as fruitlet chemical thinner on thinning efficacy and fluorescence inhibition in Gala and Fuji apple

Effect of thinning with metamitron, NAA, BA and naphthenic acids on apple (Malus domestica) trees

Evaluation of chemical fruit thinning efficiency using Brevis® (Metamitron) on apple trees (‘Gala’) under Spanish conditions

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