Stub length and stub angle did not influence renewal shoot number or branch angle of tall spindle ‘gala’/malling 9 apple trees

James R. Schupp, H. Edwin Winzeler, Melanie A. Schupp

Research output: Contribution to journalArticle

Abstract

Renewal of limbs by pruning to leave a short, angled, upward-facing stub is common practice for spindle-type apple (Malus ×domestica) training systems. A short, beveled stub cut is thought to stimulate renewal growth from latent buds present underneath the base of the excised branch, and to stimulate smaller, more fruitful renewal limbs with wide crotch angles. We conducted trials over the course of 2 years that involved dormant pruning of ‘Buckeye Gala’ with renewal cuts to compare two stub lengths, 0.5 and 2 cm, and three stub orientations, upward facing, downward facing, and vertical facing, to determine the effects on renewal shoot number, position, angle, and length. We found no clear advantages with either stub length that we evaluated, and there was no improvement in renewal shoot quality with a bevel cut at any orientation. Stub length and stub angle did not influence limb renewal and may be unimportant for training orchard-pruning crews and for machine-learning and robotic pruning.

Original languageEnglish (US)
Pages (from-to)46-49
Number of pages4
JournalHortTechnology
Volume29
Issue number1
DOIs
StatePublished - Feb 2019

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pruning
branches
apples
shoots
artificial intelligence
Malus domestica
orchards
buds

All Science Journal Classification (ASJC) codes

  • Horticulture

Cite this

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title = "Stub length and stub angle did not influence renewal shoot number or branch angle of tall spindle ‘gala’/malling 9 apple trees",
abstract = "Renewal of limbs by pruning to leave a short, angled, upward-facing stub is common practice for spindle-type apple (Malus ×domestica) training systems. A short, beveled stub cut is thought to stimulate renewal growth from latent buds present underneath the base of the excised branch, and to stimulate smaller, more fruitful renewal limbs with wide crotch angles. We conducted trials over the course of 2 years that involved dormant pruning of ‘Buckeye Gala’ with renewal cuts to compare two stub lengths, 0.5 and 2 cm, and three stub orientations, upward facing, downward facing, and vertical facing, to determine the effects on renewal shoot number, position, angle, and length. We found no clear advantages with either stub length that we evaluated, and there was no improvement in renewal shoot quality with a bevel cut at any orientation. Stub length and stub angle did not influence limb renewal and may be unimportant for training orchard-pruning crews and for machine-learning and robotic pruning.",
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Stub length and stub angle did not influence renewal shoot number or branch angle of tall spindle ‘gala’/malling 9 apple trees. / Schupp, James R.; Winzeler, H. Edwin; Schupp, Melanie A.

In: HortTechnology, Vol. 29, No. 1, 02.2019, p. 46-49.

Research output: Contribution to journalArticle

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