Tradescantia management in a New Zealand National Park

Hurrell, G. A.; Belton, Tom; Lusk, C. S.; Lamoureaux, Shona L.

doi:10.1111/j.1442-8903.2012.00664.x

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…All exotic and the 10 most common native tree and shrub species/genera recorded in the 144 treatment plots (across 6 sites) are listed, with number of plots in brackets. Hurrell et al 2012;Lusk et al 2012). Results from the current study suggest that follow-up control of tradescantia and climbing asparagus should be done within one year of initial control, whereas follow-up control of plectranthus may not be necessary for two years or more after initial control.…”

Section: Discussionmentioning

confidence: 81%

Can a reduced rate of herbicide benefit native plants and control ground cover weeds?

McAlpine¹,

Lamoureaux²,

Timmins³

et al. 2018

NZ J Ecol

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The use of herbicide to control weeds in natural areas can cause non-target damage to resident native plant communities and compromise native restoration goals. We tested 'full ' and 'reduced' (half) rates of herbicide (rates based on previous glasshouse trials) on the ground cover weed species tradescantia (Tradescantia fluminensis), plectranthus (Plectranthus ciliatus), and climbing asparagus (Asparagus scandens) to determine whether the reduced rate would cause less non-target damage to natives and achieve sufficient control of the weeds. We also included a manual removal (hand-weeding) treatment, and experimental control (non-treatment). These four treatments were applied to dense ground cover weed infestations at six lowland forest sites. Subsequent responses of the ground cover weed, native and other exotic plant species were monitored for 24 months. Two months after treatment, biomass of all three weed species was reduced to extremely low levels across all treatments relative to controls. Twenty-four months after treatment, biomass of plectranthus remained low, but tradescantia and climbing asparagus had recovered to near pre-treatment biomass levels across all treatments. Recovery of tradescantia was positively correlated with canopy openness. The reduced rate of herbicide gave a similar level of weed control to the full rate, across all three weed species, however repeat treatments appear necessary for sustained control of tradescantia and climbing asparagus. At sites invaded by plectranthus, the reduced rate of herbicide also increased native species richness. However, herbicide treatments had no effect on native plant abundance or native species richness at sites invaded by tradescantia and climbing asparagus. Manual removal sometimes benefited native plants, but all treatments increased abundance and/ or species richness of other exotic plant species at some sites. Generally, native plant abundance and native species richness decreased with increasing canopy openness, while the opposite was true for exotic species. This study provides evidence that, although repeat applications are likely necessary, a reduced rate of herbicide can benefit native plants and achieve ground cover weed control. Further research to fine-tune these results and extend them to other ground cover weed species would be invaluable.

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Section: Discussionmentioning

confidence: 81%

Can a reduced rate of herbicide benefit native plants and control ground cover weeds?

McAlpine¹,

Lamoureaux²,

Timmins³

et al. 2018

NZ J Ecol

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show abstract

“…Considerable time and money has been spent by forest managers (including Department of Conservation and Regional Councils) controlling Tradescantia in riparian zones under the premise that it could be spread by floodwaters to other uninfested areas nearby. For example, about 1000 hours and $180 000 was spent over 8 years in a 43‐ha reserve at Whakapohai in South Westland (Hurrell et al. 2012) controlling the weed in a river estuary to prevent its spread by floodwater to nearby uninfested areas in a World Heritage National Park.…”

Section: Introductionmentioning

confidence: 99%

Survival of Tradescantia fluminensis in sea water

Hurrell

Lusk

2012

Eco Management Restoration

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Summary Tradescantia fluminensis stem fragments that had been immersed in sea water for periods of 0, 1, 3, 6, 12 and 24 hours and 2, 4 and 7 days were planted into growing media and observed for regrowth for 39 days after immersion. At the end of this time, 93% of untreated fragments had produced new shoots at the nodes but only 43% of fragments produced new shoots after 24 hours immersion, and none survived longer than 2 days of immersion. Because 2 days is sufficient for dispersal to nearby coastlines, there is a real risk of Tradescantia stems being washed by floodwaters into the ocean and being carried by currents and tides into nearby estuaries and onto beaches where they could start new infestations.

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Neolema ogloblini exploring a new option for the control of tradescantia (Tradescantia fluminensis)

Jackman

Peterson²,

Robertson³

et al. 2014

NZPP

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The tradescantia leaf beetle (Neolema ogloblini) was released in 2011 as a biological control agent for tradescantia (Tradescantia fluminensis) one of New Zealands worst environmental weeds Tradescantia prevents native forest regeneration by growing over and shading out native seedlings at ground level To assess N ogloblinis effectiveness a glasshouse experiment compared ground level light readings before and after beetle feeding and the response of two native seedlings kawakawa (Macropiper excelsum) and mahoe (Melicytus ramiflorus) Feeding damage caused light readings to increase above 5 of fulllight the threshold estimated as necessary for regeneration of native plants by previous research This resulted in a significant increase in kawakawa seedling height and leaf length This study suggests that native forest regeneration may benefit from feeding damage to tradescantia caused by N ogloblini in the field

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Tradescantia management in a New Zealand National Park

Cited by 3 publications

References 6 publications

Can a reduced rate of herbicide benefit native plants and control ground cover weeds?

Can a reduced rate of herbicide benefit native plants and control ground cover weeds?

Survival of Tradescantia fluminensis in sea water

<i>Neolema ogloblini</i> exploring a new option for the control of tradescantia (<i>Tradescantia fluminensis</i>)

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