General Impact
The Sydney Olympic Park Authority (2004) states that, "Because it is so adaptable to Australian conditions, C. parqui competes strongly with bush and pasture for living space. Cattle and dairy farmers don't like cestrum at all because when green feed is short, animals eat it and die a quick and painful death. It can also be toxic to other animals, even humans. Because of its vigorous regrowth and seed lifespan, C. parqui is extremely difficult to control. It can be cut down, dug out or pushed out but follow up work is essential to prevent regrowth. Herbicides are effective, but care has to be taken not to contaminate watercourses, or allow spray to reach desirable plants." QDNRM (2005) states that, "C. parqui grows vigorously if neglected. On alluvial flats it has been known to outcompete most other vegetation. This species needs careful control because its extensive, shallow rooty system can produce many new plants from suckers, particularly after root disturbance or injury. C. parqui is toxic to animals including cattle, sheep, horses, pigs and poultry. Its effect on native fauna is unknown. Symptoms in cattle include fever, loss of appetite, increased thirst and eventually, general paralysis. Poultry develop acute kidney and liver damage. Post-mortem examination of poisoned animals usually reveals extensive internal haemorrhaging." Croft and Holding (2004) state that, "The presence of this plant on many properties and in backyards means that there is the potential for children to gain access to plant material, especially seeds."
Location Specific Impacts:Queensland (Australia) 
Human nuisance: Cestrum parqui is an escaped garden plant, which has become a weed of roadsides, creeks and neglected sites in central and south-east Queensland (QDNRM, 2005).
Pathogenic: The roots, stems and leaves of Cestrum parqui are toxic to many domestic animals (QDNRM, 2005). Bega Valley (Australia)
Human nuisance: Handling Cestrum parqui may cause contact dermatitis in some people (Eurobodalla Shire Council, 2004).
Modification of successional patterns: Cestrum parqui can dominate the understorey and prevent regeneration by native plants (Eurobodalla Shire Council, 2004).
Pathogenic: Cestrum parqui is poisonous to both livestock and humans (Eurobodalla Shire Council, 2004). Eurobodalla (Australia)
Human nuisance: Handling C. parqui may cause contact dermatitis in some people (Eurobodalla Shire Council, 2004).
Modification of successional patterns: Cestrum parqui can dominate the understorey and prevent regeneration by native plants (Eurobodalla Shire Council, 2004).
Pathogenic: Cestrum parqui is poisonous to both livestock and humans (Eurobodalla Shire Council, 2004). Shoalhaven (Australia)
Human nuisance: Handling Cestrum parqui may cause contact dermatitis in some people (Eurobodalla Shire Council, 2004).
Modification of successional patterns: Cestrum parqui can dominate the understorey and prevent regeneration by native plants (Eurobodalla Shire Council, 2004).
Pathogenic: Cestrum parqui is poisonous to both livestock and humans (Eurobodalla Shire Council, 2004).
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