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  • From: "Idell Weydemeyer" <>
  • To: "'North American Fruit Explorers'" <>
  • Subject: Re: [NAFEX] Summer pruning
  • Date: Sat, 28 Aug 2010 16:12:17 -0700

Info on timing of apricot pruning in climates without lots of cold
weather--also wound healing-- can use data to compare to your areas

The recommendation in cooler (closer to the coast--away from 100+ degree
days inland) areas of California is to finish pruning apricots by late
August into September--

"pruned in late August to allow time for the pruning wounds to close. This
will help to prevent Eutypa fungus from invading the tree. Allow 6 weeks
prior to the beginning of winter rains for wounds to close. Avoid cutting
into the branch bark ridge, which is where new tissue that promotes wound
closure originates. "

-----Original Message-----
[] On Behalf Of Douglas Woodard
Sent: Saturday, August 28, 2010 2:14 PM
To: North American Fruit Explorers
Subject: Re: [NAFEX] Summer pruning

I think that much depends on *what* you are pruning and *why* and
*where* and *when*.

I recall British discussions of pruning apricots. With them in Britain
apparently the big problem is a bacterial disease called "dieback" which
can be deadly. The recommendation as I recall it was to prune in early
June (?) at the time of fastest growth when the tree would be least
liable to infection and wound healing quickest. Apparently this was
found to give satisfactory results but pruning at other times had been
found to be dangerous. I suspect that other species of Prunus in other
places may be subject to similar considerations.

In Niagara Peninsula orchards the custom is to prune peaches when the
trees are in blossom, perhaps partly for quick healing but probably
mostly so one can see what the effect of winter has been on the fruit
buds, and whether the need is to reduce or conserve the crop.

Regarding promoting growth versus dwarfing in apples:

If you prune during the dormant season (but in cold areas it's best to
prune when the risk of extreme cold is past, at least after the first
half of February) then the stored food from the roots is sent up into
whatever wood remains on top to promote growth. Whether this is good or
bad depends on the situation. Is the tree a weak-growing or a vigourous
cultivar? is it bigger than you want or do you want it to grow? what is
the soil? water supply? light exposure? Are you trying to dwarf the tree?

If the aim is dwarfing then one wants to wait until whatever sugar was
stored in the roots has been brought up, and maybe till after the spring
flush of growth has passed.

Adjusting crop load or exposing fruit to light may suggest different

If cold-hardiness is in doubt whether due to cultivar or location, then
I'd say don't prune after mid-July or in extreme cases the beginning of

If you are pruning to shape a vigourous cultivar which hasn't yet borne
its first fruit and is known to be late in coming into bearing (Northern
Spy is the classic example) then you want to avoid dormant pruning and
to prune as little as possible, guiding growth by techniques like
pinching buds as much as you can. With a young Spy tree on seedling
stock you can delay its fruiting till the 20th year by careless dormant

I suggest that you think about the factors that are operating in your
case, put them together, and be wary of simplistic old sayings.

Doug Woodard
St. Catharines, Ontario, Canada wrote:
> In a message dated 8/28/2010 9:47:08 AM Eastern Daylight Time,
> writes:
>> OK, but in that case, wouldn't I be better off pruning now, rather
>> than waiting for dormant pruning? After all, in either case, the wound
>> won't be healed by spring. But it might be a LITTLE further along if I
>> prune now.
> Hello Bill,
> I submit there are fungal spores in the air now that will not be there
> in say Feb. Pruning now before spring active growth begins simply leaves
> the wound open and exposed longer.
> But if you will be tight for time next spring now is better than not
> pruning at all.
> I heard one man say once there are only 52 days a year that you can't
> prune apples, every Sunday. But I've pruned many trees on Sundays and
> lightening hasn't struck me yet.
> Jerry
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