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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Containing pompom weed with registered herbicides is not a short-term undertaking, making eradication impossible

Containing pompom weed with registered herbicides is not a short-term undertaking, making eradication impossible
Jeremy Goodall, Ed Witkowski
ARC-PPRI & University of the Witwatersrand

Trials were conducted to test the performance of the registered herbicides picloram (Access 240 SL, Dow AgrSciences) and metsulfuron-methyl (Brush-Off, Du Pont) on the control of Campuloclinium macrocephalum (pompom weed) in hydric and xeric grasslands in Gauteng Province.  Both herbicide formulations were sprayed as broadcast foliar applications at rates specified on the herbicide labels for three consecutive years in either summer (February) or autumn (April) and monitored for an additional 3 years after spraying was discontinued.  Metsulfuron-methyl and picloram were equally effective according to the timing of applications in both vegetation types. However, both achieved an average pompom weed mortality that was <80% of what is expected of registered herbicides. Uncontrolled  factors,  that  included  outbreaks  of  the  rust  Puccinia  eupatorii,  fires  and  drought, occurred from the second year of the study. Gas chromatography of topsoil did not detect either metsulfuron-methyl or picloram during any of the sampling intervals from 0 to 56 days after treatment. Registered herbicides did not reduce C. macrocephalum successfully after three annual applications and it is estimated that around 5 summer or 7 autumn treatments are required to reduce weed density

to <1 plant per plot (25 m2).  More research is required to study rust–herbicide interactions, the role of fire in managing asteraceous weed seed banks and fire as a pre-treatment that could be integrated with chemical control.

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General News Updates

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