M9? G41? Apple Rootstocks Explained with John Strang ( EPS # 88)

B9? EMLA107? What's the difference between the many different types of rootstocks used for apple trees. And which is the best for you? Learn more in this episode of The Urban Forestry Radio Show and Podcast. Our expert guest is John Strang, Retired Extension Fruit and Vegetable Specialist from the University of Kentucky.

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Chapters
00:00 Introduction
02:17 What are apple rootstocks?
03:07 History of apple rootstocks
04:07 History of Malling apple rootstocks
04:43 How Malling propagated rootstocks
06:04 Apple rootstocks from around the world
07:41 Why different rootstocks are needed
08:33 How fruiting keeps dwarfing trees small
09:54 Why dwarfing rootstocks can be brittle
10:52 Downside of dwarfing trees
12:44 Changing popularity of rootstocks
16:42 Apple rootstocks and fruit tree nurseries
19:16 Growing apple rootstocks from seed
20:09 What is fireblight
22:39 Fireblight resistant rootstocks
23:23 How to wash pesticides off apples
24:23 Bagging apples to protect them from pests
25:41 Apple rootstocks in Florida
29:49 Fruit tree grafting online course
30:50 Whiffletree Nursery
31:58 Silver Creek Nursery
35:23 Rootstocks and scions that work well together
37:00 Apple rootstocks for Alaska
40:20 Apple rootstocks in Canada
41:59 Freestanding dwarf rootstocks
43:59 Semi dwarf rootstocks for public spaces
44:34 Interstem grafting
47:03 Thinning fruit to increase tree growth
52:10 Bud9 vs M9 apple rootstocks
54:13 Grafting with Dolgo rootstock
56:05 Why dwarfing trees need more care*
58:14 Show wrap up

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[Biophile]

You can most certainly buy individual or bundles of 10 rootstocks these days as well as scionwood. It's becoming a lot more popular these days.

[jeffnielsen]

Paraphrase: "A resistant rootstock does not give resistance to the scion, you still need to take care of the scion/variety. It's good to have the rootstock resistant because the suckers of the rootstock may be the entry port of the bacteria/fireblight.

In all my reading, I have never had this explained, thank you.

[mzaffar]

What is the role of soil type in selecting a rootstock/plant. Generally the high density apple plantation is cultivated on loamy soil . Can we experiment hdp on clay soil type found in rice cultivating areas? If yes which one of the available rootstock/plants you ll recommend.

Watching your channel very intrestingly & thank you so much for bringing up very informative podcosts.

[delprice]

Outstanding, thankyou! Have you made a presentation of research into apple replant disease?

[jeffreygardner]

Hi. Do you have any information about the depth to which the roots of the B9 or B10 rootstock can reach? I have a 40-inch water table with a well drained soil. I would like to get more information about the behavior of the roots. Thank you

[combatveteran]

What do you think about taking a cutting from your favorite tree and trying to root it? Would you get the same apple as the one you like and how hard would be to get the cutting to root

[kumarraj]

can we use water apple as root stock for grafting apple scion?

[grahamlait]

The most widely used rootstock in the world is still M9. Unlike the rest of the world, West Malling developed their rootstocks with a degree of scientific research that had never been seen before. The experimental trees were grown with glass walled subterranean tunnels beside them so that the rootstocks could be examined in growth, be properly evaluated and photographed. As usual, the Brits gave it all away to the rest of the world for free, the result of which is that the British tree fruit industry has been decimated by foreign competition because the UK doesn't have a particularly good climate for growing tree fruits and there's nothing you can do about the weather.

[DinorwicSongwriter]

What is the best root stock for honeycrisp planted in heavy clay with temp to -40, northwest ontario, near dryden. I plan to plant 3 varieties, 100 trees total. What two kinds of apples would be best with applecrislp? I also want 20 romeo cherry trees, 20 juliet & 20 of another type of cherry but I cant decide. Any suggestions? And I want to plant hazelnuts.

[christinebottaro]

Is is even possible to get rid of fireblight from a tree that has signs of infection? If so, how?