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Reworking challenges and rootstock compatibility

NSW DPI citrus roadshow, October 2017

G. Sanderson, D. Monks, T. Witte and A. Creek NSW DPI & K. Lacey Dept. Primary Industries and Regional Development

Reworking - key factors to consider Rootstock and interstock

Herbicides

Tree age

Tree health and scion wood

Painting (sunburn)

After-care

- Bag opening

- Graft management

- De-suckering

- Nurse limb removal

Costs

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2 years

6 months

18 months

ARC Nadorcott SL

20162014

2

2015

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Re-grafting top-worked trees Buddy tape wrapped graft stick

4 weeks

6 weeks

15 weeks

3

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Other top-working methods

Chip bud into regrowth Patch bud - Spain

Reworking to Orri, Spain (March 2017)

Bordeaux (copper) paint

4

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Orri mandarin de-suckering (Dareton)

Selecting a rootstock requires:

Knowledge of the site conditions.

Knowledge of the rootstocks limitations and compatibilities.

An understanding of how rootstocks influence the horticultural performance of different cultivars.

5

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Scion Incompatibility

Can be highly specific.

Several visual symptoms.

Becomes obvious as early as <3 years of age or as late as 8-12 years or more.

Rootstock ‘suckering’

6

 

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Navelina on Swingle

Yellow ring

Amigo mandarin on citrange rootstock

Decline at year 18 from planting

7

 

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2011

2012

2014

Imperial mandarin

Troyer citrange

Daisy mandarin on Swingle, Bindoon WA

8

   

      

    

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Afourer (Nadorcott) mandarin on Swingle, Spain

19 year old

Eureka seedless lemon

Cox Benton citrange Cox

Gin Gin, WA 2012

Dareton, NSW 2016

9

 

 

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Interstocks

Eureka lemon/Clymenia/Troyer Imperial/Valencia/Troyer

Interstock – Double bud

1. Valencia

2. Variety

Rootstock

10