Jasper
F1 hybrid tomato · Solanum lycopersicum · introduced 2013
- Breeding
- F1 hybrid
- Growth habit
- Indeterminate
- Days to maturity
- 60-65 days
- Fruit
- red, cherry
- Weight
- -
- Bred by
- Johnny's Selected Seeds
Origin & history
The 2013 AAS-winning red cherry from Johnny's breeding: candy-sweet fruit on plants that stay healthy through blight seasons that strip other cherries bare.
Measurements
| Measurement | Value | Context |
|---|---|---|
| Days to maturity | 60-65 days | Consensus range across the cited sources, which include both independent references and commercial catalogs. |
Trial results
What this variety did in published university trials. These are observations of a season, not properties of the seed, so they are kept separate from the measurements above and are never merged into them. Letters are each report's own mean-separation groups.
Evaluation of Late Blight Resistant Tomato Varieties, 2013
2013 · New York · full season · published as "Jasper"
| Measurement | Result | Method |
|---|---|---|
| Late Blight severity * | 8.6 % | Visual severity rating under natural infection |
| Late Blight: disease progress (AUDPC) | 99.3 index | Area under the disease progress curve |
Evaluation of Late Blight Resistant Tomato Varieties, 2012
2012 · New York · full season · published as "Jasper"
| Measurement | Result | Method |
|---|---|---|
| Late Blight severity * | 0.1-1.8 % | Visual severity rating under natural infection |
* Measured differently in different trials. disease severity varied between the trials above. AMSeed shows both figures rather than averaging them, because the difference between them is the finding: performance depends on the site, the season and the protocol, and a single blended number would hide exactly that.
Each trial states its own limits, and they are worth reading before acting on any figure here. Yields in these reports are extrapolated from small research plots and run higher than commercial farms achieve; cull rates reflect the disease pressure of one particular season.
Traits
Disease resistance
| Code | Disease | Level | Basis |
|---|---|---|---|
| - | Late Blight (Phytophthora infestans) | tolerant | Independently observed |
| - | Early Blight (Alternaria linariae (A. solani)) | tolerant | Breeder declared |
| - | Septoria Leaf Spot (Septoria lycopersici) | tolerant | Breeder declared |
| F | Fusarium Wilt of Tomato (Fusarium oxysporum f. sp. lycopersici) | resistant | Breeder declared |
Breeder declared means the resistance was stated by whoever breeds or sells the seed. That is not a reason to disbelieve it, and for most resistance genes it is the only evidence that exists: the breeder screens the line and publishes the result in their catalog, and no independent party re-tests it. We label it rather than quietly presenting it as though someone had checked.
Related varieties
- F1 hybrid
Sweet Chelsea
65-70 days · Indeterminate
- F1 hybrid
Sweet Million
60-65 days · Indeterminate
- F1 hybrid
Apero
65-70 days · Indeterminate
- F1 hybrid
Esterina
65-70 days · Indeterminate
- F1 hybrid
Favorita
60-65 days · Indeterminate
- F1 hybrid
Five Star Grape
65-70 days · Indeterminate
Explore all tomato varieties · compare any two · when to plant it where you are
Sources & References
Evidence: 4 sources, including 3 independent references.
- Johnny's Selected Seeds catalog · Johnny's Selected Seeds, Seed Catalog
- Vegetable MD Online · Cornell University, Plant Pathology, University or Government
- Evaluation of Late Blight Resistant Tomato Varieties, 2012 · Cornell Long Island Horticultural Research and Extension Center (2012), University or Government
- Evaluation of Late Blight Resistant Tomato Varieties, 2013 · Cornell Long Island Horticultural Research and Extension Center (2013), University or Government