1996-1997 New England Apple Pest Management Guide, pp. 16-17
Scab-resistant apple cultivars offer a means for reducing or even eliminating
the need for fungicides. While these cultivars may be referred to as "disease-resistant",
resistance beyond scab varies. There are some diseases, in particular summer
rots and blemishes, that will remain a problem in all of these cultivars
and may require a few fungicide applications for adequate control.
Commercial growers have not planted these cultivars on a large scale, largely
because it is difficult to gain acceptance of any new cultivar. Still, many
of these cultivars produce fruit of commercial quality. For those growers
who can develop a market for "low-spray" fruit, these cultivars
may be useful. We recommend any of these cultivars for planting on a limited
basis only, as the problems which may develop in any area using a minimal
pesticide program can vary.
Storage potential for SRCs has not been widely investigated. SRCs maturing
in August generally have only 2­p;3 weeks of storage life. Prima
was extensively tested at Nova Scotia and judged suitable only for short-term
storage of less than 2 months in regular (air) cold storage. Liberty, Novamac,
Nova Easygro, and Macfree were judged suitable for 2­p;4 months of
regular storage whereas Novaspy held well for more than 4 months in regular
storage. GoldRush and Enterprise have also held up well in long-term storage
in other more limited tests.
Table 5 -- Scab-resistant Cultivars
| Characteristics | Resistance |
Cultivar |
Harvest Dates (days from full bloom) |
Size In. |
ÄColor ÄShape ÄFlesh ÄFlavor |
Notes |
C A R |
M I L |
F B |
||
| Pristine | 7/25--8/10 (80--90) |
2.5--3.0" | ÄYellow ÄOblate Ä - (no data) ÄMild, pleasant |
A summer apple in Lodi season, but significantly better quality and shelf life than Lodi or Yellow Transparent. | - | - | - | ||
| William's Pride | 8/10--8/20 (90--100) |
2.5--3.0" | Ä100% dark red to purple ÄOblate to round ÄMedium to coarse; firm ÄMild subacid; rich |
Generally before Paulared. May ripen unevenly. Sometimes shows water core and bitter pit. | R | M | M | ||
| Redfree | 8/15--8/30 (90--105) |
2.0--3.0" | Ä90% dark red stripes on yellow ÄOblate ÄMed. coarse, tender, juicy ÄSweet, good |
Unusually crisp for early season apple. Sweeter less acidic than Paulared. Tree vigor is low, fruit size may be a problem. | S | R | R | ||
| Dayton (PRI) |
8/15--8/20 (100--110) |
2.7--3.3" | Ä80% dark red ÄOblate to round ÄFine grain, firm & crisp ÄSubacid to mild |
Paulared season. Very rust susceptible. May not be cold hardy enough for northern areas. Fruit quality in VT considered fair. | S | R | R | ||
| Prima | 8/25--9/15 (100--120) |
2.5--3.5" | Ä70% red/orange, dark red stripes ÄOblate, slight rib ÄSlightly coarse, crisp, juicy ÄSlightly sweet, sprightly |
Quality generally better in cooler climates, thought winter hardiness a problem in coldest areas. Requires multiple harvests. | S | R | R |
| Novamac | 9/10--9/15 (110--115) |
3.0" | Ä70% red stripe on green ÄOblate ÄFine, crisp, juicy ÄSubacid, fair |
A very McIntosh-like apple. Considered only fair quality in some regions. | R | M | R | ||
| Jonafree | 9/10--10/1 (120--130) |
2.5--3.5" | Ä90% red stripes ÄOblate, irregular ÄCoarse, crisp, juicy ÄSweet, sprightly |
A Jonathan-like apple, with a very firm flesh and tough skin. Trees are productive. Quality only fair in northern New England. | S | M | M | ||
| NY 75414-1 |
9/22 (125) |
2.7--3.0" | Ä75% dark red ÄOblate, symmetric ÄFine, crisp, juicy ÄSweet, subacid, like Macoun |
Midseason apple with Macoun-like character. Stores 4-6 months. Trees are upright, less precocious than Empire. Moldy core problems. | R | R | R | ||
| Freedom | 9/25--10/5 (125--135) |
2.7--3.0" | Ä80%orange red stripes on yellow ÄOblate ÄTender, juicy, coarse ÄSprigthly, subacid, unique |
Very uneven in terms of quality. Fruit finish is poor without any fungicides. If picked too early, storage scald is a problem. | R | R | M | ||
| Liberty | 9/25--10/5 (125--135) |
2.5--3.3" | Ä90% dark red stripes ÄOblate to conical ÄSlightly coarse, crisp, juicy ÄSweet, sprightly |
A proven good quality SRC for the McIntosh region. Produces like Empire. Harvest window narrow. Storage improves flavor. | R | R | R | ||
| Nova Easygro | 9/20--10/5 (125--135) |
3.0" | Ä80% dark red to stripe ÄOblate ÄCoarse, crisp, slightly juicy ÄSweet, good |
Moderately productive. Fruit coloring a problem in warmer areas. Quality improves with storage. | R | R | R | ||
| Macfree | 10/5--10/15 (135--150) |
2.7" | Ä90% dark red stripes/grn ÄRound, smooth ÄSlght.tough, jcy., coarse ÄSweet, near McIntosh |
Coloring a problem in southern, warmer areas. Tendency to be biennial. | S | M | - | ||
| Enterprise | 10/10--10/20 (140--155) |
2.7--3.5" | Ä90--100% red on yellow­p; green ÄRound to elongated ÄMed. grain, firm, crisp ÄVery spicy, rich and sprightly acid |
Harvested with Rome Beauty. Stores well, flavor improves with 1 month storage. Tree vigorous. Thick skin. Good commercial potential. | R | M | R | ||
| GoldRush | 10/15--10/30 (145--160) |
2.5--3.0" | ÄGreenish to deep yellow ÄOblate, regular ÄMedium grain, firm, very crisp ÄComplex, spicy |
Late harvest will probably limit adaptability in the north. Stores well. Moderately vigorous tree. | S | - | - | ||
| Novaspy | 10/15--10/30 (145--160) |
2.5--3.0" | ÄRed blush or stripe on green yellow ÄOblate ÄFine grain,firm,crisp,jcy ÄSweet, moderate acid |
A Northern Spy type apple. Probably will have limited role in areas with
shorter season. |
- | M | - |
CODES:
CAR = cedar apple rust
MIL = Powdery mildew
FB = Fire blight
R = Resistant, M = Moderately resistant or tolerant, S = susceptible