Post bloom spraying apple trees with prohexadione-calcium and gibberellic acid affects vegetative growth, fruit mineral content and bitter pit incidence

Amarante, Cassandro Vidal Talamini do; Steffens, Cristiano André; Freitas, Sérgio Tonetto de; Silveira, João Paulo Generoso; Denardi, V.; Katsurayama, José Masanori

doi:10.17660/actahortic.2020.1275.27

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Resent research on 'Honeycrisp' has shown higher levels of BP development on 'G.41' rootstock compared with less vigorous rootstocks such as 'Budagovsky 9' ('Bud 9') or 'M.9-337' (Valverdi and Kalcsits, 2021). However, BP development in apples is also variable among years, and across scion and rootstock genotypes (Amarante et al, 2020;Volz et al, 2006), suggesting the influence of several environmental and genetic factors in development of these disorders (De Freitas and Mitcham, 2012;Ferguson and Watkins, 1989).…”

Section: Resultsmentioning

confidence: 99%

“…In the current study, there was no relationship between GS incidence and fruit weight nor fruit diameter (data not shown). The relation between fruit size and Ca-related physiological disorders is debatable, whereas many studies have shown a positive relation between BP and larger fruit size (Fallahi et al, 1985;Perring and Jackson, 1975;Reid and Kalcsits, 2020;Valverdi and Kalcsits, 2021), several others have not found a direct correlation (Amarante et al, 2020;Donahue et al, 2021;Ferguson and Watkins, 1992). Recently, Donahue et al (2021) suggested that the relation with fruit size and BP occurs only with exceptionally large fruit, in 'Honeycrisp' with 48 to 56 size box (equivalent to >89 mm fruit and 340 g fruit), below which threshold there is no correlation.…”

Section: Resultsmentioning

confidence: 99%

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Rootstock and Nutrient Imbalance Leads to ‘‘Green Spot’’ Development in ‘WA 38’ Apples

Sallato

Whiting

Munguia

2021

horts

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‘WA 38’ is a new apple (Malus domestica Borkh.) cultivar, released by Washington State University (WSU) in 2017. An unknown disorder, ‘‘green spot’’ (GS), dark green halos in the epidermis, with necrotic, corky, and oxidated cortical tissue underneath the damaged epidermis, leads to unmarketable fruit and has become a threat to the adoption and profitability of ‘WA 38’, with young and mature orchards exhibiting up to 60% incidence in 2020. Given the apparent susceptibility of ‘WA 38’ to GS, this research investigated GS relation with nutrient levels in fruit. Research was carried out in 2018 and 2019 in a ‘WA 38’ apple block planted in 2013, on ‘Geneva 41’ (‘G.41’) and ‘M.9-Nic 29’ (‘M.9’) rootstocks. In both years, fruit number per tree, fruit weight, and fruit diameter were evaluated in 18 trees per treatment, from both rootstocks. From each tree, fruit were classified for presence or absence of GS, and subsequently analyzed for nutrient concentration in the peel and in the flesh, nutrient extraction, and total nutrient content, on an individual apple basis. Apples with GS had higher nitrogen (N) and magnesium (Mg) levels in the peel, regardless of year and rootstock. Apples grown on ‘G.41’ rootstock exhibited higher GS incidence and reduced crop load in both years; reduced size and fruit diameter were exhibited only in 2018. Fruit on ‘G.41’ had higher N, potassium (K), and Mg in the flesh and higher N and Mg in the peel, with lower levels of calcium (Ca) in the flesh and peel; however, only in 2018, with no differences in 2019. GS in ‘WA 38’ apples appears to be another Ca-related disorder in which excessive vigor, rootstock, and N and Mg excess are predisposing factors for its development.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rootstock and Nutrient Imbalance Leads to ‘‘Green Spot’’ Development in ‘WA 38’ Apples

Sallato

Whiting

Munguia

2021

horts

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“…PCa is widely employed in apple trees to control the vegetative growth of the plants, with positive results in pruning and no important deleterious effect on overall fruit quality and yield (Rademacher et al, 2004;Duyvelshoff and Cline, 2013;Amarante et al, 2020). Nowadays, PCa is being used in pear trees to hinder vegetative growth, especially of cultivars grafted on vigorous rootstocks (Carra et al, 2016;2017b).…”

Section: Introductionmentioning

confidence: 99%

Effect of the application of prohexadione-calcium on the growth of ‘Packham’s Triumph’ and ‘Hosui’ pears (Pyrus communis L.)

Dalzochio

Silvestre

Pauletti

2021

RSD

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The necessity of controlling the vegetative growth of fruit trees is a growing concern for farmers since vigorous plants tend to have lower fruit yields. The use of chemicals that inhibit the vegetative growth of plants, such as prohexadione-calcium (PCa), an inhibitor of gibberellins which is currently used as a growth regulator for apple trees, is an agricultural practice aimed to help in reducing pruning time and cost. Pear trees grafted on vigorous rootstocks tend to present high rates of vegetative growth, hindering fruit production. Thus, this work aimed to evaluate the effect of the application of different doses of the plant growth regulator PCa on the vegetative growth, pruning time, radiation incidence, and productive and quality parameters of ‘Packham’s Triumph’ and ‘Hosui’ pears grafted on vigorous rootstocks. Two PCa applications were carried out, the first after the falling of petals (2009-10-10), and the second twenty-one days after the first (2009-11-02). The observed results showed a significant effect of PCa in reducing the vegetative growth of the pear trees and the pruning time in both cultivars. The effect on photosynthetic active radiation (PAR) was observed only in the ‘Packham’s Triumph’ variety, not being observed for the ‘Hosui’ pear trees. No statistical difference was observed relative to the quality parameters and yield of the fruits, in both cultivars, showing that PCa application has not caused any deleterious effect on fruit development.

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Post bloom spraying apple trees with prohexadione-calcium and gibberellic acid affects vegetative growth, fruit mineral content and bitter pit incidence

Cited by 2 publications

References 15 publications

Rootstock and Nutrient Imbalance Leads to ‘‘Green Spot’’ Development in ‘WA 38’ Apples

Rootstock and Nutrient Imbalance Leads to ‘‘Green Spot’’ Development in ‘WA 38’ Apples

Effect of the application of prohexadione-calcium on the growth of ‘Packham’s Triumph’ and ‘Hosui’ pears (Pyrus communis L.)

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