Apple Rootstock Flashcards

1
Q

List of dwarfing apple rootstocks and the virus free (EMLA) counterpart; (3)

A

Malling 27 - EMLA 27
Malling 9 - EMLA 9
Malling 26 - EMLA 26

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2
Q

Most significantly dwarfing rootstock;

A

Malling 27 (with virus).

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3
Q

Characteristics of Malling 27;

A

Produces Tree’s 1.5m-2m tall.
Good for high density planting.
Can be used as an inter stock.

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4
Q

Malling 9 characteristics;

A

Originated as a chance seedling in France.
Seldom over 3m
Can be used as an inter stock (limited dwarfing)
Requires support
Susceptible to wooly apple aphid.

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5
Q

Malling 7a Characteristics (4)

A

Semi dwarfing rootstock.
tol-erant of excessive soil moisture, but susceptible to crown gall.
Well-anchored staking is required for the first few years.
suckers badly, and the trees are not very winter-hardy.
(Suggested tree spacing is 4.2 4.8 m (14 16 ft))

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6
Q

‘Malling 26 Characteristics (5)

A
  • a cross between ‘Malling 16’ and ‘Malling 9.’
  • larger and sturdier than ‘Malling 9’.
  • quite winter-hardy,
  • does not tolerate heavy or poorly drained soils,
  • Susceptible to fire blight (Erwinia amylovora) but less to collar rot
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7
Q

‘Malling-Merton 106.’

A
  • susceptible to crown rot (Phytophthora)
  • The roots are well anchored and do not sucker.
  • not resistant to early fall freezes
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8
Q

Malling-Merton 111.’ (4)

A
  • highly vigorous Rootstock
  • It does well on a wide range of soil types.
  • susceptible to mildew - not susceptinle to collar rot or woolly aphid.
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9
Q

Robusta No. 5 Characteristics (4)

A
  • vigorous
  • very hardy clonal apple rootstock
  • strong compatability
  • It is the best rootstock for use where extreme winter-hardiness is required.
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