Re: Flowering Crab Apple Tree

Jesse, I forgot to describe Deno's cycles in case you aren't familiar with
his work.  Each cycle last 3 months so:
> M. 'Red Splendor' at 70F  - 15% , then 3% more at 40F, then 70% more at
70F
means 15% germinated during the 3 months at 70F, then he put them in the
fridge at 40F and got 3% more, and after that 3 months in the fridge he
brought them back to 70F whereupon 70% more germinated.  The two that had
86% germ in the first cycle were good enough that he apparently didn't
bother trying for more.

Kitty

----- Original Message ----- 
From: "Kitty" <kmrsy@comcast.net>
To: <gardenchat@hort.net>
Sent: Thursday, September 02, 2004 5:27 PM
Subject: Re: [CHAT] Flowering Crab Apple Tree


> Jesse,
> I've got 2 pretty good sources here.  First Deno, then the US Ag handbook.
> Then a few pointers from AHS Plant Propagation
>
> Deno tested 4 hybrid crabapples from fresh and dry stored seed.  He says,
> "Most of the germination occurred in the first cycle if sown at 40F and in
a
> 70F-40F-70F pattern if sown at 70F.  The fruits were collected in winter
and
> the seeds washed in water and cleaned daily for a week.  Fresh seed data:
> M. 'Bob White' at 40F - 86% germ in 2-8 weeks
> M. 'Donald Wyman' at 40F  - 86% germ in 2-9 weeks
> M. 'Red Splendor' at 40F  - 100% germ in 2-10 weeks
> M. 'Red Splendor' at 70F  - 15% , then 3% more at 40F, then 70% more at
70F
> M. unnamed yellow at 70F - 11% , then 12% more at 40F, then 75% more at
70F
> in 2nd week
> When GA-3 was apploed to red Splendor the seeds germinated more slowly and
> in a lower percentage.
>
> The Ag Handbook doesn't supply a lot of info because they say, "There is a
> huge amount of literature on the germination of apple seeds."  But they do
> provide, "Apple seeds display dormancy which has been overcome by
> prechilling.  ASOA standards for Malus species are substrate: paper;
> incubation temperatures: 18-22C; duration: 7-10 days; addtnl directions:
use
> embryo excision method or TZ. (TZ - ? - wasn't included in the glossary).
> Apple rootstocks are often grown from seed in nurseries.  Untreated seeds
> can be sown in the late fall and prechilled seeds in the spring.  Sow 0.6
to
> 1.25 cm deep in rows and mulch with a thin layer of sawdust.  Germination
is
> epigeal."
>
> AHS
> Fleshy fruits: Pulp smaller fruits and leave in warm water for up to 4
days
> to separate out the seeds, which should sink to the bottom.  Dish
detergent
> added to the water may assist separation.  Once seeds are clean, pat dry.
> Most ornamental crabapples are self-sterile, but some come true to type.
> Clean ripe fruits in autumn and sow outdoors.  Alternatively, sow the
seeds
> in the refrigerator; in early winter, soak seed for 48 hrs, drain, and
> refrigerate for 3-6 months before sowing.
>
> I don't know how much any of this helps, but it's a start.
>
> Kitty
>
> ----- Original Message ----- 
> From: "Jesse Bell" <silverhawk@flash.net>
> To: "Gardenchat" <gardenchat@hort.net>
> Sent: Thursday, September 02, 2004 1:36 PM
> Subject: [CHAT] Flowering Crab Apple Tree
>
>
> > O.K. all you master gardeners and advanced master gardeners....and
anybody
> else who knows the answers here.....question:
> >
> > How long should the seeds be "cold treated" and how cold does it have to
> be?
> >
> >
> > From what I've read, most crab apples are propagated by grafting or by
> > digging up the suckers. I have found very little information on the
> > seeds. There are some very, very old and very beautiful crab apples in
> > the park across from the building where I work. I just went and picked
> > up some of the tiny little "apples" and now I'm wondering....how long do
> > they have to be cold treated before they will sprout?
> >
> >
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