Invasiveness Assessment - Keriberry (Rubus rugosus) in Victoria
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Plant invasiveness is determined by evaluating a plant’s biological and ecological characteristics against criteria that encompass establishment requirements, growth rate and competitive ability, methods of reproduction, and dispersal mechanisms.
| Each characteristic, or criterion, is assessed against a list of intensity ratings. Depending upon information found, a rating of Low, Medium Low, Medium High or High is assigned to that criterion. Where no data is available to answer a criterion, a rating of medium (M) is applied. A description of the invasiveness criteria and intensity ratings used in this process can be viewed here. |
The following table provides information on the invasiveness of Keriberry.
A more detailed description of the methodology of the Victorian Weed Risk Assessment (WRA) method can be viewed below:
Victorian Weed Risk Assessment (WRA) method (PDF - 630 KB)
Victorian Weed Risk Assessment (WRA) method (DOC - 1 MB)
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Common Name: Keriberry
Scientific name: Rubus rugosus
| Question | Comments | Rating | Confidence |
| Establishment | |||
| Germination requirements? | No information found. | M | L |
| Establishment requirements? | “Found under slight shade” (Dassanayake & Fosberg, 1980) | MH | H |
| How much disturbance is required? | In its native range, “found under slight shade, in bushy thickets, along edges of jungles or in dense mossy forests” (Dassanayake & Fosberg 1980). “Serious creekline weed…Found in creeks in the Perth area” (Hussey et. al, 1997). Beyond its native range it establishes in highly disturbed natural ecosystems. | ML | H |
| Growth/Competitive | |||
| Life form? | Semiscandent [scrambling] shrub (Dassanayake & Fosberg, 1980). | L | H |
| Allelopathic properties? | No information found. | M | L |
| Tolerates herb pressure? | No information found. | M | L |
| Normal growth rate? | Strongly growing (Dassanayake & Fosberg, 1980). Very vigorous to 3 m (anon., 2005). | H | H |
| Stress tolerance to frost, drought, w/logg, sal. etc? | “Keep soil moist especially when young…Sandy to clay loam as long as drainage adequate…Avoid areas with heavy or frequent frosts” (anon., 2005). Moderate frost tolerance, intolerant of drought and waterlogging. | L | ML |
| Reproduction | |||
| Reproductive system | “Seeds… Stems sprawl and root where they touch the ground” (Hussey et. al, 1997). | H | MH |
| Number of propagules produced? | Heavy fruiting (anon., 2005). Not enough data. | M | L |
| Propagule longevity? | No information found. | M | L |
| Reproductive period? | No information found. | M | L |
| Time to reproductive maturity? | “Healthy plants produce fruit after 18 months” (anon., 2005). | ML | ML |
| Dispersal | |||
| Number of mechanisms? | “New plants are spread from seeds carried by birds and foxes” (Hussey et. al, 1997). | H | MH |
| How far do they disperse? | As the seeds are carried by birds and foxes (Hussey et. al, 1997) it is likely that some propagules will disperse greater than 1 km. | H | MH |
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