Bladder ketmia (Hibiscus spp.)
Mature plant of narrow-leaf bladder ketmia
(Photo A. Storrie)
There are two species of bladder ketmia. The cotyledons of both species are similar in shape, with one leaf circular to broadly oval and the other circular with a slightly flattened base. Wide-leaf bladder ketmia has two forms generally distinguished by the colour of the centre of the flower. For details on the distinguishing factors see the Integrated Weed Manual.
Factors that make Bladder ketmia a major weed:
- Both species of bladder ketmia are able to produce a large number of seeds
- Strong seed dormancy and a number of dense seedling flushes throughout spring and summer make bladder ketmia difficult to control
- Narrow-leaf bladder ketmia is tolerant of glyphosate
- Dense stands of bladder ketmia can cause localised yield loss
- The weed, which may be easily spread through poor farm and machinery hygiene, is a crop pathogen host
Further detail about this weed including integrated weed management tactics that could be considered when developing a management plan can be found in the section on problem weeds in the Integrated Weed Management Manual.
Ecology and biology of common weeds are outlined in section 6 of the Integrated Weed Management Manual.