Chester
Rubus hybrid
 
|
 | A semi-erect blackberry developed by
the USDA-ARS in Illinois and Maryland from a cross between a
breeding selection and 'Thornfree'
| Medium (~5g) sized fruit; deep black
color; round shape; medium number of drupelets per fruit; large
size seeds;
| Good flavor but very different and less
aromatic than trailing blackberry (i.e. 'Marion')
| Thornless; very high yielding
| Late ripening season; typically begins
in mid-August and can go until frost. |
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|
Kotata
Rubus hybrid
 |
| From a cross of two USDA selections;
grandparents include Boysenberry, two wild Northwest blackberries
and an eastern blackberry.
| Medium to large (6-7g) fruit; deep black
color; medium seed.
| Fresh season is typically July 1 - July
24. |
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|
Silvan
Rubus hybrid
|
| A trailing blackberry from a cross of
ORUS 742 x Marion; cross was made by G.F. Waldo with USDA-ARS in
Corvallis who sent the seed to Australia (Victoria) where the
original selection and development took place.
| Generally similar to 'Marion' in growth
habit, yield and fruit quality.
| High yields produced on very vigorous,
thorny plant
| Medium-large (6.2 g) fruit, larger than
'Marion'; purple-black color; excellent flavor; excellent processing
characteristics. Fresh fruit are not as firm as 'Marion'
| Early ripening (2-6 days before
'Marion') typically beginning in late June and extending until about
the 3rd week of July.
| Growers report greater winter hardiness
than 'Marion'
|
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|
Waldo
Rubus hybrid
 |
| From a cross of two USDA selections, one
grand parent is Marion.
| Medium to large (6-7g) fruit; deep black
color; very uniform conic shape; high number of drupelets per fruit;
medium size seeds.
| Thornless; easier on workers and
eliminates thorn contaminants concerns.
| Late ripening |
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