A5090139446- Biological Control of Invasive Species
- Ecology and Vegetation Dynamics Studies
- Weed Control and Herbicide Applications
- Plant and fungal interactions
- Animal Ecology and Behavior Studies
- Rangeland and Wildlife Management
- Botany, Ecology, and Taxonomy Studies
- Plant and animal studies
- Species Distribution and Climate Change
- Forest Insect Ecology and Management
- Botany and Plant Ecology Studies
- Forest Ecology and Biodiversity Studies
- Seedling growth and survival studies
- Aquatic Invertebrate Ecology and Behavior
- Plant responses to water stress
- Bioenergy crop production and management
- Plant Taxonomy and Phylogenetics
- Wildlife Ecology and Conservation
- Forest ecology and management
- Helminth infection and control
- Turtle Biology and Conservation
- Flowering Plant Growth and Cultivation
- Insect Pheromone Research and Control
- Coastal wetland ecosystem dynamics
- Climate change impacts on agriculture
AgResearch
2014-2025
Nassella neesiana (Chilean needle grass) reduces farm profitability through its sharp seeds that damage wool, skins, hides and carcasses. It poses a biosecurity risk in New Zealand's Hawke's Bay region due to seed dispersal via gravel crushed aggregate from braided rivers. This study evaluated flotation sieving remove both dry imbibed panicle seeds. We measured their length, width, mass, flotation, passage sieves with without the awn (a hygroscopic, bristle-like structure). The awned were,...
We used the process-oriented niche model CLIMEX to estimate potential global distribution of serrated tussock under projected future climates. Serrated is a drought-tolerant, wind- and human-dispersed grass South American origin that has invaded pastures in Australia, Europe, New Zealand, Africa. The likely effect climate change on its was assessed by applying six climate-change scenarios previously developed model. projections climatic suitability current revealed considerable scope for...
Pastures represent about half of the global agricultural area and productivity losses from weeds are significant. The complex interactions between them other pasture plants, livestock environment imply a need for innovative research that transforms management. To this end, horizon scan was conducted to identify relevant issues, questions, opportunities, drivers. drivers were ranked using three criteria: (1) is (is driver likely become important in 10–20 years?); (2) will require stretchy...
Nassella tussock (Nassella trichotoma) occurs most frequently in droughtprone grasslands several areas of New Zealand where it is the subject surveillance and/or regional management strategies The potential range nassella was estimated using a climate model developed from global distribution data (excluding known for Zealand) suitability gridded dataset with spatial resolution 10 minutes arc projections encompassed all current occupation as determined records ten Local Authorities and...
Globally, lowland forests have been depleted, fragmented, and degraded by land clearance conversion humans.Many remnants are also invaded non-native plants mammals, which can exacerbate biodiversity loss impede ecosystem recovery.We examined the effects of ground cover weeds mammals on seedling recruitment native woody in northern New Zealand following establishment over 2 years at sites experiencing different levels weed cover, with or without supplemental seed addition, mammal exclusion.In...
The species composition of the understory can be a key indicator successional trajectories in absence disturbance at forested sites.We surveyed and percent cover 132 closed-canopy stands 41 woody weed throughout New Zealand as first step understanding potential these populations.Twenty-seven had zero, or very few, conspecific seedlings saplings present beneath their own canopy.Fourteen medium to high numbers and/or present.Some variable regeneration, with some sites, but none...
Invasive exotic tree and shrub species (woody weeds) form dense, monospecific stands in many areas of New Zealand.At some sites, the weed dies out naturally is replaced by native as succession proceeds, but at others persists indefinitely.The ability to distinguish between these different trajectories critical effective management, conditions that determine successional outcomes remain poorly understood.However, clues trajectory any given woody site can be found understory, because...
Tall buttercup, a native of central and northern Europe, has become naturalized in the United States Canada, South Africa, Tasmania New Zealand. In Canada Zealand it an economically significant weed cattle-grazed pastures. this study we develop CLIMEX model for tall buttercup use to project weed's potential distribution under current future climates presence absence irrigation. There was close concordance between model's projection suitable climate recorded observations species. The highly...
Summary The weedy grass Nassella trichotoma (nassella tussock), historically an economically damaging invader of modified tussock grasslands in New Zealand, currently causes little if any reduction farm production. This is a result successful historical regional management programmes which plants have been removed manually (by grubbing) each year before they seed. To inform debate about the need for ongoing management, we developed stage‐structured spatially explicit integrodifference...
The efficacy of control tactics for Ranunculus acris was quantified on poorly- and well-drained soils in a factorial experiment conducted over three years 18 dairy pastures. Soil drainage, gibberellic acid nitrogenous fertiliser (growth promoters), bioherbicide utilising Sclerotinia sclerotiorum had no effect the cover R. acris. herbicides aminopyralid aminopyralid+triclopyr, by contrast, gave long-lasting reductions weed substantial temporary clovers. Flumetsulam, thifensulfuron methyl,...
The use of herbicide to control weeds in natural areas can cause non-target damage resident native plant communities and compromise restoration goals.We tested 'full' 'reduced' (half) rates (rates based on previous glasshouse trials) the ground cover weed species tradescantia (Tradescantia fluminensis), plectranthus (Plectranthus ciliatus), climbing asparagus (Asparagus scandens) determine whether reduced rate would less natives achieve sufficient weeds.We also included a manual removal...
ABSTRACTHerbicide dose-responses of seedling progenies Ranunculus acris populations varying in herbicide exposure history indicate that this weed has evolved multiple resistance to phenoxycarboxylic acid and acetolactate synthase (ALS)-inhibitor herbicides. To test the hypothesis 'multiple-resistance' can occur same plant, we conducted an experiment where 11 clones R. acris, parental population these two mode-of-action herbicides, were treated with full- half-label doses MCPA flumetsulam....
Giant buttercup (Ranunculus acris L) is an unpalatable weed in New Zealand dairy pastures and estimated to cost the industry over 150 million annually lost milk solids revenue In this study survival of giant seedlings was determined by following their fates permanent plots on eight randomly selected farms Takaka Valley from November 2004 August 2008 Seedling emergence occurred yearround but tended be higher winter spring than summer autumn very low with less 5 surviving beyond 12 months...
Abutilon theophrasti (velvetleaf, butterprint), a problematic weed of crops in some temperate countries, was introduced into New Zealand 1948 as potential fibre crop. It has naturalised the North Island Waikato and Auckland regions but its status at many sites where it inadvertently sown 2015 contaminant Beta vulgaris seed lines remains unknown. To determine distribution species we used an existing newly developed climate niche model, both constructed using modelling software CLIMEX current...
We present a simple Poisson process model for the growth of Tradescantia fluminensis, an invasive plant species that inhibits regeneration native forest remnants in New Zealand. The was parameterised with data derived from field experiments Zealand and then verified independent data. gave good predictions which showed its underlying assumptions are sound. However, this had less predictive power outputs based on variance suggesting some were lacking. Therefore, we extended to include higher...
This study aimed to determine the effects of different management practices for Tradescantia fluminensis in lowland podocarp/broadleaf forest remnants lower North Island Fourteen 50 m line transects across eight sites were established April 2009 and assessed annually until 2012 Management prior during period documented Over four assessments changes numbers native plant seedlings species differed greatly between as did percent cover other weeds Native diversity improved more abundance...
An experiment was conducted to determine the influence of time grubbing in late spring–early summer, panicle developmental stage at grubbing, and presence or absence roots on grubbed plants, initial post-senescent viability fruits Nassella trichotoma North Canterbury, New Zealand. The percentage viable, following desiccation panicles removed from plants field, increased 1% for just beginning emerge leaf sheath, 49% fully extended grubbing. Similarly, as date delayed November (late spring)...
Wandering Jew (Tradescantia fluminensis Vell) is a common weed in canopydepleted indigenous forest remnants New Zealand In this study triclopyr was applied to dense stands of wandering at range rates each two experiments (Diamond Harbour the South Island and Te Pahu North Island) determine its effects on subsequent regrowth The cover initially reduced by 80100 with herbicide application At about 1 year after had regrown 350 depending rate some seedlings begun appear However survival these minimal