This study was carried out to investigate the effects of different AVG (aminoethoxyvinylglycine) treatments on pre-harvest fruit drop rates and ripening levels of ‘Jonagold’ apples. A total of 225 mg L -1 AVG dose was applied at once in a single application at different times or divided into doses and applied different times. Compared to control treatment, entire AVG treatments increased fruit removal force and significantly decreased the pre-harvest drop rates. AVG treatments applied at once (225 mg L -1 ) 8 or 4 weeks before the anticipated harvest time were found to be more effective than the divided treatments. AVG treatments inhibited ethylene biosynthesis and such an inhibition was more distinctive in single 225 mg L -1 treatments. AVG treatments decreased flesh softening, starch degradation rates and consequently retarded fruit ripening. The 225 mg L -1 AVG treatment applied 4 weeks before the harvest significantly increased L* value and hue angle both in the year 2010 and 2011. NAA (naphtaleneacetic acid) at 10 mg L -1 sprayed 4 and 2 weeks before anticipated harvest was found to be insignificant in control of pre-harvest fruit drops. NAA treatment decreased flesh firmness, and did not have any

Predicting Harvest Date Windows for Apples

AVG application regimes play an important role on pre-harvest drop and ripening of 'Jonagold' apples A aplicação de doses de AVG desempenha um papel importante na queda, pré-colheita e maturação de maçãs 'Jonagold'

The continual increase of local apple production urges the op timization of all factors that impact fruit quality and quantity, in particular to those destined for long -term cold storage. Among them, the harvest dates of each apple cultivar intended for long -term storage are of great importance to the final freshnes s and quality of the fruits. In developed countries, those dates are being determined through the frequent assessment of some fruit maturity indicators, of which the most popular include: fruit firmness, total soluble solids and starch conversion. On the other hand, picking up apples when they have reached their maximum fr uit weight increases the growers’ income. It has been shown that such issues are not sufficiently known by the respective stakeholders in our country. This study was focused on assessing t he progress of the abovementioned maturity indicators and fruit weight in 2012 of three main Korca region apple cultivars, Golden Delicious, Red Chief and Granny Smith. The measurements were made in five day intervals , five times for the first two cultivar s and six times for Granny Smith. There was not found any significant difference between the optimal harvest dates for long-term storage of respective cultivars, despite from their location. Fruit growth continued very slightly after those days, to reach their maximum weight. The results were similar to the outcomes of same studies made in other countries. It has been argued the importance of appropriate harvest scheduling for each apple cultivar, based on fruit destination, as another way to incre ase the efficiency and incomes.

Assessment of some maturity indicators and fruit growth in three apple cultivars

Replacement of existing cultivars with similar apples having better postharvest traits

Low-temperature threshold and growth degree day (GDD) for two pistachio cultivars

This study aimed to identify the efficiency of mechanical flower thinning (MFT) and its influence on apple fruit quality. In the first experiment, ‘Arisoo’ apple flowers were subjected to MFT with one hundred sixty-two (half) and three hundred twenty-four (full) strings at the same rotor (300 rpm) and tractor (6 km/h) speeds. Hand thinning was performed as a control. The number of removed flowers in each terminal and lateral flower cluster was slightly higher in MFT with full-strings than that of MFT with half-strings. The fruit set rate was lower in MFT with full-strings than that of MFT with half-strings. However, the use of full-strings during mechanical thinning increased the leaf damage rate compared to half-strings. Except a* value, MFT with full-strings improved flesh firmness, soluble solids content (SSC) and titratable acidity (TA), and reduced starch pattern index of fruits at harvest compared to the control. In the second experiment, ‘Fuji’ apple flowers were subjected to chemical thinning, MFT (300 rpm, 6 km/h), and MFT + chemical thinning treatments and compared with hand thinning (control). The thinning efficiency of MFT was similar to that of chemical thinning and MFT + chemical thinning treatments in terms of the removal of flowers and fruit set rates. Compared to the control, MFT, chemical thinning, and their combined treatments improved flesh firmness and SSC of fruits at harvest. TA was highest in the chemical thinning treatment compared to other thinning treatments. However, fruit size, weight, and a* value were unaffected by any treatment. In conclusion, the use of full-strings during MFT achieved optimal results in ‘Arisoo’ apples. In ‘Fuji’ apples, MFT treatment alone achieved effective results and the addition of chemical thinning after MFT had no supportive role in thinning efficiency and fruit quality.

/pdf/influence-of-mechanical-flower-thinning-on-fruit-set-and-1l0ufpgo.pdf

Influence of Mechanical Flower Thinning on Fruit Set and Quality of ‘Arisoo’ and ‘Fuji’ Apples

/pdf/predicting-harvest-date-windows-for-apples-3r14j81ukr.pdf

Predicting Harvest Date Windows for Apples

Citations

AVG application regimes play an important role on pre-harvest drop and ripening of 'Jonagold' apples A aplicação de doses de AVG desempenha um papel importante na queda, pré-colheita e maturação de maçãs 'Jonagold'

Assessment of some maturity indicators and fruit growth in three apple cultivars

Replacement of existing cultivars with similar apples having better postharvest traits

Low-temperature threshold and growth degree day (GDD) for two pistachio cultivars

Influence of Mechanical Flower Thinning on Fruit Set and Quality of ‘Arisoo’ and ‘Fuji’ Apples

Related Papers (5)

Responses of early, mid and late season apple cultivars to postharvest application of 1-methylcyclopropene (1-MCP) under air and controlled atmosphere storage conditions

1-Methylcyclopropene Inhibits Apple Ripening

Development of apple superficial scald, soft scald, core flush, and greasiness is reduced by MCP.

Inhibitors of ethylene responses in plants at the receptor level: Recent developments

Bitter pit in apple fruit