Effects of succinic acid-2,2-dimethyl hydrazide (Alar) or scoring on growth and flower initiation of young apple trees

Veinbrants, N

doi:10.1071/ea9720089

Cited by 10 publications

(5 citation statements)

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“…of fruit per tree and yield per tree. Early SADH application at 1000 ppm has been reported to increase bloom in 'Delicious' (10), but SADH applied in 1974 had no effect on fruit per tree or yield in 1975.…”

Section: Resultsmentioning

confidence: 94%

Responses of Vigorous ‘Delicious’ Apple Trees to Pruning and Growth Regulator Treatments1

Elfving

Forshey

1976

J. Amer. Soc. Hort. Sci.

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In March 1974 vigorous 1-year-old terminal branch sections of ‘Delicious’/Mailing 9 apple (Malus domestica Borkh.) trees were all headed-back 2/3 or removed (3/3). Three weeks after full-bloom (AFB) the dormant-pruned trees received current-season's-shoot removal and/or 1000 ppm succinic acid-2,2-dimethyl-hydrazide (daminozide, SADH) treatments in a factorial experimental design. Total number and growth of shoots from 1- and/or 2-year-old branch sections were the same regardless of dormant pruning. Only a small amount of that growth occurred on 2-year-old branch sections where terminals were headed-back 2/3. Nitrogen movement was altered in the fruiting zone of the canopy by heading-back treatments. Shoot removal AFB affected total shoot growth only when bases where shoots were removed were treated with 1% naphthaleneacetic acid (NAA). SADH reduced shoot growth 18%. Yield was primarily a function of fruit-load in the interior of the tree and was reduced by every treatment which increased shoot growth on 2-year-old branch sections. In 1974 effects of treatments on yield were independent and combinations of treatments individually increasing yield showed addtive effects. Heading-back 3/3 in 1974 reduced fruits per tree in 1975 due to spur loss. Only the 1974 shoot-removal treatments had a carry-over effect on shoot growth in 1975.

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Section: Resultsmentioning

confidence: 94%

Responses of Vigorous ‘Delicious’ Apple Trees to Pruning and Growth Regulator Treatments1

Elfving

Forshey

1976

J. Amer. Soc. Hort. Sci.

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“…The induction of flowering in apple is possible by training shoots to grow horizontally (Longman et al. 1965) and by scoring (Veinbrants 1972). Scoring is a single cut with a knife completely around the trunk of the tree.…”

Section: Discussionmentioning

confidence: 99%

Overexpression of BpMADS4 from silver birch (Betula pendula Roth.) induces early‐flowering in apple (Malus × domestica Borkh.)

et al. 2007

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To shorten the juvenile stage of apple (Malus · domestica Borkh.) the BpMADS4 gene from silver birch (Betula pendula Roth.) was constitutively overexpressed in 25 transgenic apple clones. All clones were characterized by PCR, RT-PCR and Real Time PCR. Solitary flowers were produced on in vitro shoots of eight transgenic clones and most of them appeared to be morphologically normal. Twenty shoots of each clone were rooted and transferred to a glasshouse. Glasshouse plants of clones T1165, T1187 and T1190 developed flowers. Several plants of T1165 and T1187 started floral initiation within 3-4 months following transfer to the glasshouse. Primary flowers were solitary and in a terminal position on the main shoot. Lateral flower clusters, consisting of three to five individual flowers, were also found. Pollen vitality and tube germination of glasshouse-grown flowers were investigated, and there were no significant differences compared to pollen of nontransgenic control plants. Preliminary crosses using flowers of glasshouse plants resulted in small apple fruits. It would seem that this is the first report on in vitro flower induction in transgenic apple.

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“…Tree crowding may occur before fruiting is sufficient to help reduce vegetative growth. Limb spreading, scoring (14) and growth regulators (3,12,16,17) are often useful techniques for increasing flower bud formation and fruit set. This investigation compares the effectiveness of several of these techniques for inducing early bloom and fruit set of 'Richared Delicious' and 'Starkrimson Delicious' apples.…”

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confidence: 99%

Evaluation of Scoring, Limb Spreading and Growth Regulators for Increasing Flower Bud Initiation and Fruit Set on Young ‘Delicious’ Apple Trees1

Greene

Lord

1978

J. Amer. Soc. Hort. Sci.

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A 3-year study was undertaken to compare the effectiveness of mechanical and chemical techniques to enhance flower bud initiation and fruit set on young ‘Delicious’ apple trees (Malus domestica Borkh. Scoring, limb spreading, and growth regulators predictably reduced terminal growth, but only scoring consistently increased bloom. When bloom was increased, fruit set did not always follow. The most effective treatment for increasing fruit set was (2-chloroethyl)phosphonic acid (ethephon) at 1000 ppm plus 1000 ppm succinic acid-2,2-dimethylhydrazide (daminozide). Combination sprays of ethephon plus daminozide show promise for restricting vegetative growth of non-bearing ‘Delicious’.

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Effects of succinic acid-2,2-dimethyl hydrazide (Alar) or scoring on growth and flower initiation of young apple trees

Cited by 10 publications

References 0 publications

Responses of Vigorous ‘Delicious’ Apple Trees to Pruning and Growth Regulator Treatments1

Responses of Vigorous ‘Delicious’ Apple Trees to Pruning and Growth Regulator Treatments1

Overexpression of BpMADS4 from silver birch (Betula pendula Roth.) induces early‐flowering in apple (Malus × domestica Borkh.)

Evaluation of Scoring, Limb Spreading and Growth Regulators for Increasing Flower Bud Initiation and Fruit Set on Young ‘Delicious’ Apple Trees1

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