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1

Ethylene evolution intensity and apple fruit setting after thinning with NAA and ethephon

100%
Gonkiewicz A.
Journal of Fruit and Ornamental Plant Research
|
2011
|
tom 19
|
nr 1
The experiment took place in 2006 and 2008. In 2007, the study did not take place due to severe damage to the buds and flowers caused by a spring frost. The subjects of the experiment were 14-year-old 'Sampion' apple trees grafted on the MM 106 rootstock. The auxin NAA, at the concentrations of 20 and 60 mgl-1, and ethephon, at the concentrations of 200 and 600 mg l-1, were used in the experiment. Spraying was carried out at the end of blooming, after 80% of the petals had fallen off the crown. Five days after spraying, the quantity of ethylene evolved from the fruitlets was measured. Large quantities of ethylene evolving were observed after spraying with ethephon, especially when used at 600 mg l-1. Spraying with auxin solutions caused large quantities of ethylene to be observed only during the first year of the study, two days after spraying with the 60 mg l-1 solution of NAA. From the third day after spraying with NAA, ethylene evolution from the fruitlets was observed to be only slightly higher than in the control. During the second year of the study, treatment with NAA caused a slight increase in ethylene evolution only during the first day after treatment. During subsequent days the evolved quantity of ethylene did not differ significantly from the control. In spite of the significant difference in the quantity of the ethylene evolved from the fruitlets, the percentage of the fruitlets was similar after using the agents at the higher concentrations: ethephon at 600 mgl-1 and NAA at 60 mgl-1, as well as at the lower concentrations. The treatments had only a slight influence on the reduction in the total yield. However, they were found to have a favourable influence on fruit size. The results of the study show a higher percentage of fruit with a diameter exceeding 7 cm in the total yield.
2

Thinning of 'Katja' apple trees with chemicals and manually

100%
Porebski S., Banach P., Rzeznicka B.
Journal of Fruit and Ornamental Plant Research
|
2006
|
tom 14
3

Efficiency of fruitlet thinning in apple ‘Gala Must’ by use of metamitron and artificial shading

84%
Basak A.
Journal of Fruit and Ornamental Plant Research
|
2011
|
tom 19
|
nr 1
The use of the photosynthesis inhibitor metamitron, and the use of temporary arti­ficial shading as two methods of fruitlet thinning, were evaluated in 2006 and 2008 in apple trees 'Gala Must'. The use of these 2 methods used separately, were expected to induce a temporary decrease in photosynthetic intensity which would strengthen the competition between the fruitlets. This process would then lead to the abscission of the weaker ones. For this purpose, metamitron (preparation Goltix 700SC) was used. A dose of 350 mg/l was sprayed on the trees either one time (when fruitlets were 6­8 mm in diameter), or twice (the second spraying was repeated 6 days later on fruitlets 10-14 mm in diameter). Another group of trees was covered for 5 to 14 days with polipropylene material causing about a 70% reduction of light. In 2006, only the double metamitron treatment caused significant reduction of fruit set (comparable to hand thinning). This resulted in an increase in the fruit size and yield of marketable (> 70 mm) apples without negative effect on the total yield, 'internal quality' and red colour of the apples. In 2008, the good effect of thinning was noticed after one spray with metamitron, while a double treatment caused over-thinning. The single treatment with metamitron positively influenced fruit size, the distribution of apples in size classes, and yield of apples with diameters of > 70 mm. Comparable thinning was recorded in trees artificially shaded for 10 days; fruitlets were 6 to 14 mm in diameter. The uniform distribution of fruits, which were homogenous in size in the canopy of the trees, proved that both methods of thinning have high selectivity.
4
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Optimisation of thinning of apple fruitlets cv. 'Braeburn Mariri Red'

84%
Szot I., Lipa T.
Acta Agrophysica
|
2019
|
tom 26
|
nr 3
5

The effect of fruitlet thinning on fruit quality parameters in the apple cultivar 'Gala'

84%
Basak A.
Journal of Fruit and Ornamental Plant Research
|
2006
|
tom 14
|
nr Suppl.2
6

Thinning of flowers-fruitlets in organic apple production

84%
Stopar M.
Journal of Fruit and Ornamental Plant Research
|
2004
|
tom 12
|
nr Spec.ed.
7

Ogrodnicze przypomnienia - sadownictwo

67%
Rydzik A.
Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała
|
2002
|
nr 06
5-6
8
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The influence of Floredux, MaxCel and Brevis on the yield of apple trees cv. Sampion

67%
Szot I., Lipa T., Dobrzanski jr. B., Kaplan M., Baryla P.
Acta Agrophysica
|
2018
|
tom 25
|
nr 4
Flower or fruitlet thinning is one of the cultural practices used for improving the fruit quality and regulation of yield. The effect of ATS (FloreduX), 6-BA (MaxCel) and metamitron (Brevis) on yield and some fruit characteristics of apple trees cv. Šampion/ M.9 T337 was evaluated. Chemical thinning agents were applied alone, as subsequent spraying or as a tank mixture. Due to the possibility of damage to flowers by the announced frosts, a preparation containing sea algae – Goëmar was added in some treatments. Thinning with only MaxCel resulted in an excessive reduction of the total yield expressed in the number of fruits and their mass, but using MaxCel after flower thinning with Floredux gave very good results. The total yield expressed in kg tree-1 was even bigger than in the control, but the share of fruits with diameter above 7.5 mm was much better. The most promising method of thinning apple trees cv. ‘Szampion’ was the use of MaxCel+Brevis, at fruitlets diameter of 10-12 mm. The yield expressed by the number of apples on a tree was much smaller than in the control, but total yield did not differ from the total yield of the control trees. Apples in this treatment were characterised by the highest mass and length, as well as large diameters. In the fruits of this treatment, there was no significant reduction in flesh firmness relative to the control, and they had the highest dry matter content.
9

Ogrodnicze przypomnienia - sadownictwo

51%
Barton R.
Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała
|
1998
|
nr 06
6
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