Metamitron and Different Plant Growth Regulators Combinations in the Chemical Thinning of ‘Eva’ Apple Trees

Goulart, Carolina; Andrade, Suélen Braga de; Bender, Angélica; Schiavon, Andressa Vighi; Aguiar, Gabriel Almeida; Malgarim, Marcelo Barbosa

doi:10.9734/jeai/2017/36809

Cited by 11 publications

(13 citation statements)

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“…Metamitron is among the products currently being tested for the chemical thinning of temperate fruit trees (McARTNEY and OBERMILLER, 2012;McARTNEY et al, 2012;McARTNEY and OBERMILLER, 2014;PETRI et al, 2016b;GOULART et al, 2017;GABARDO et al, 2017a). This product has been used for the thinning of apple trees in the Southern region of Brazil and has shown satisfactory results in the reduction of fruit load in plants (PETRI et al, 2016b;GABARDO et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Time of metamitron application and concentration in the chemical thinning of ‘Maciel’ peach

et al. 2019

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In the peach tree cultivation, the producer has the challenge of obtaining good quality fruits and maintaining production in a balanced way over the years. Thinning favors these parameters and reduces the fruit load on plants. Manual thinning commonly practiced on peach trees requires high labor and increases production costs. Chemical thinning as an alternative to manual thinning, which depending on the species, time and concentration, has demonstrated high efficiency. The aim of this study was to evaluate the effect of metamitron applied at different seasons and concentrations on the chemical thinning of peach trees in southern Brazil. Experiments were conducted in a commercial peach orchard (‘Maciel’ cultivar), in the municipality of Morro Redondo, Rio Grande do Sul, Brazil, during the 2015 and 2016 harvests. In experiment 1, metamitron at concentration of 200 mg L-1 was applied at 20, 30, 40, 50 and 60 days after full bloom and manual thinning performed at 40 days after full bloom. In experiment 2, metamitron was applied at concentrations of 100 mg L-1, 200 mg L-1, 300 mg L-1 and 400 mg L-1 and manual thinning at 40 days after full bloom, in addition to control plants. Fruit abscission, fruit set, total number of fruits per plant, yield per plant, average mass and fruit diameter were evaluated. Metamitron at concentration of 200 mg L-1 has thinning effect when applied before 40 days after full bloom. Metamitron concentration of 100 mg L-1 applied at 40 DAFB promoted fruit abscission superior to manual thinning. Therefore, the application of metamitron to ‘Maciel’ peach trees close to full bloom at concentration of 100 mg L-1 results in thinning practice similar to manual thinning.

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Section: Introductionmentioning

confidence: 99%

Time of metamitron application and concentration in the chemical thinning of ‘Maciel’ peach

et al. 2019

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“…Metamitron may be an efficient alternative to peach tree thinning (McArtney et al, 2012). In apple tree cultures, several thinning processes have already been carried out with metamitron, which has been efficient to make fruits fall (Petri et al, 2016;Goulart et al, 2017;Gabardo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

Barreto¹,

Farias²,

Zandoná³

et al. 2019

JAS

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The need to decrease production costs along with the lack of man power in the countryside has asked for cultural practices which lead to these factors, such as thinning. Thus, chemical thinning has been studied as an alternative to fruit manual thinning. Therefore, this study aimed at evaluating the quality of peach tree fruits after chemical thinning with metamitron at different time periods in the south of Brazil. The experiment was carried out in a commercial peach tree orchard with cultivars ‘Maciel’ in Morro Redondo, Rio Grande do Sul state, Brazil, from 2015 to 2016. Treatments consisted in the application of metamitron (doses of 200 mg L-1) on the 20th, 30th, 40th, 50th and 60th day after full bloom (DAFB) and manual thinning on the 40th DAFB. Epidermis color, pulp firmness, ripeness index, soluble solids, titratable acidity, juice pH, total phenolic compounds and antioxidant activity were evaluated. The application of metamitron in peach tree thinning did not affect peach color. Changes in the other variables related to the quality of fruits depended on the application period of metamitron in the thinning process and between crops.

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“…To reduce production costs, thinning techniques that use less manpower, such as chemical and mechanical thinning have been studied. Chemical thinning has tested products as such as 6benzyladenine (BA), metamitron and naphthalene acetic acid in apples (Petri et al, 2016;Goulart et al, 2017;Gabardo et al, 2017) and ammonium thiosulfate in cherry (Schoedl et al, 2009). In peach trees, the tested products are BA, gibberellins and ethylene (Meitei et al, 2013;Giovanaz et al, 2014;Giovanaz et al, 2016); however, variations on results are reported according to the cultivar, product, season of application, product dose and climatic conditions of the growing site.…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical thinning using 6-benzyladenine (BA) on Maciel peach (Prunus persica L.)

Barreto¹,

Navroski²,

Zandoná³

et al. 2018

Aust J Crop Sci

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High effective peach fruit set results in an excessive amount of fruits, requiring thinning accomplishment, which is a manual practice and demands specialized labor, raising production costs. In this sense, chemical thinning may be an alternative to improve the peach production chain. The objective of this work was to evaluate the efficiency of 6-benzyladenine (BA) on chemical thinning and the effect of different BA dosages on peach production and color characteristics of 'Maciel' fruits. Treatments consisted of plants without thinning (Control), sprayed BA at doses of 100 mg L-1 , 200 mg L-1 and 400 mg L-1 , applied 45 days after full bloom (DAPF) and hand thinning at 45 DAPF. The applications of different dosages were carried out by spraying, using backpack spraying equipment. Percentage of thinning abscission, number of fruits per plant, yield per plant, fruit mass, color and average fruit diameter were evaluated. The doses of 200 and 400 mg L-1 BA for thinning increased the percentage of fruit abscission and fruit mass. The doses of 400 mg L-1 BA presented lower yield per plant, but fruits with higher average mass. Increasing BA dose reduced the number of fruits per plant. Hand thinning and 400 mg L-1 BA resulted peach fruits with larger diameter. BA application to thin peaches did not alter the fruit skin color. Therefore, BA may be a chemical thinning alternative for 'Maciel' peach cultivar, because it reduces the time of thinning in plants when compared to manual thinning. For an efficient chemical thinning with BA the product dose must be taken into account, along with climatic conditions and the cultivar.

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Metamitron and Different Plant Growth Regulators Combinations in the Chemical Thinning of ‘Eva’ Apple Trees

Cited by 11 publications

References 0 publications

Time of metamitron application and concentration in the chemical thinning of ‘Maciel’ peach

Time of metamitron application and concentration in the chemical thinning of ‘Maciel’ peach

Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

Effect of chemical thinning using 6-benzyladenine (BA) on Maciel peach (Prunus persica L.)

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