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["hector black" <hblack1925@fastmail.fm>]

We've had a couple of Aronias for quite a few years.  Nero we've had the longest.  I've picked the berries at various stages or ripeness and never found them palatable.  They may do better in a colder climate than ours - hot humid summers, zone 6.  I've seen them growing elsewhere and they look healthier than ours (up north). Also grow Viking which seems to be very similar to Nero in our experience.  Ours grow to bushes about 6-7 ft. tall.  Perhaps they would do better pruned lower?  They also tend to defoliate in late August.  Not very heavy fruit production which may also be due to lack of pruning.  They did better when they were about 4-5' high.

    Hector Black, zone 6 middle TN

----- Original Message -----

From: Thomas Olenio

To: 'North American Fruit Explorers'

Sent: Saturday, January 06, 2007 9:08 AM

Subject: [NAFEX] Astringency

Hello,

 

Interesting article on astringency;

 

http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-2621.1993.tb06191.x

 

Temperature Affects Astringency Removal and Recurrence in Persimmon

RUTH BEN-ARIE¹ and LILLIAN SONEGO¹

 ABSTRACT

Astringency was removed from'Triumph'persimmons by immersion in water at 40°C for 5 hr or 60°C, for 1 hr. Similar treatments at 20° and 80°C, had no effect on astringency reduction. Subsequent application of 80% CO₂ for 48 hr was effective for 20°C-treated fruit but not for 80° C-treated fruit, which became nonastringent only after exposure to acetaldehyde. Extending the 60°C treatment beyond 2 hr resulted in recurrence of astringency, which was not reduced by subsequent CO₂ treatment. Astringency also recurred in CO₂-treated non-astringent fruit, when exposed to high temperatures. The disappearance and recurrence of astringency correlated with amount of methanol-soluble tannins.

 

---

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