Vegetables New Zealand

Reports
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Access member-only reports in this section.

Determination of pre harvest intervals for a range of insecticides in salad leaf crops

August 2014: This report summarises a salad leaf pre harvest interval (PHI) trial conducted in Gisborne during February and March 2014 on five varieties of salad leaf.  Click here to download the report

Buried Weed Seed Longevity: Interim Results for Years 1-4

January 2014: This study was conducted to determine the "decay" rates of seven annual grass weeds.  Click here to download the report.

Great White Butterfly

November 2014: Great White Butterfly Report Update

Click here to download the report.

Drip Irrigation SFF 12 109 - Final Report

April 2013: This booklet provides case studies and technical information about the use of drip irrigation for vegetable production in New Zealand. The technology is used in many countries with considerable advantage, but is not widely adopted in New Zealand. In 2012, Vegetables NZ and Irrigation NZ sought to identify key issues showing wider adoption of this internationally proven technology. Understanding these barriers forms a critical component of on-going industry efforts to increase water and nutrient use efficiency in cropping systems.

Click here to download the report

Diamondback Moth in New Zealand  “An integrated pest management (IPM) program for vegetable brassicas”   

April 2012: Final report for the management of diamondback moth (DBM), Plutella xylostella, in New Zealand include reassessment of the status of insecticide resistance, and updating the insecticide resistance management rotation strategy for DBM within the context of a revised integrated pest management (IPM) program for vegetable brassicas.

Click here to download the report

Carrot Violet Root Rot

July 2010: Violet root rot (VRR) is a serious fungal disease of carrots and potatoes, and threatens the long term viability of the vegetable industry in the Ohakune district. Previous attempts at control have been largely unsuccessful. This report summarises the third year of a three-year programme to evaluate the potential of commercial fumigants to control VRR.

Click here to download the report

Hedging our bets: choosing hedgerow plans to enhance beneficial insects to optimise crop pollination and pest management on Canterbury farms

June 2010: A desk-top study which examines the associations between plants, insect herbivores, their natural enemies and pollinators to evaluate the potential of using perennial plant assemblages on non-productive areas of a farm to maximise the establishment and abundance of beneficial insects. Pollination and pest suppression are key on-farm services provided by beneficial insects (pollinators, predators, and parasitoids). Yet the potential of beneficial insects to provide these essential services is often not realised because they are absent or low in numbers, generally due to historical management practices.

Click here to download the report

Treatment of hydroponic wastewater using a denitrification filter system

June 2009: Nitrogen and phosphorous removal from wastewater of a hydroponic greenhouse operation was investigated over the summer of 2009.  This study aimed to investigate whether adequate removal of these nutrients could be achieved, determine the key operating parameters, and establish a general design of a denitrification filter system. 

Click here to download the report.


Integrating energy efficiency and pest management of vegetable covered crops

Update 28 March 2009: MAF SFF/ Fresh Vegetable & Fresh Tomato Product Groups funded project in its third and final year of work.  A major achievement in this reporting period (to end March 2009) has been the successful importation into containment of Tamarixia trizoae.  The colony has established and has shown good parasitism rates.  Progress in other areas continues to be hampered by the distraction of psyllid and Liberibacter which remains a major concern for industry and is occupying a significant proportion of our key researcher's time.  The project is indirectly assisting these activities by providing a working group for discussing responses to the issue and disseminating information.  For these reasons the project is behind on some milestones and the budget is under spent. 

Click here to download the 28 March 2009 progress report.


Graft transmission and seed transmission of Liberibacter

Summary: Research conducted by MAF suggests that the Liberibacter species which has been identified in New Zealand solanaceous crops is not transmitted by seed, but is graft transmissible. 

Click here to download the report on seed transmission, or click here to download the report on graft transmission.


The Carbon Footprint of New Zealand

Summary: There is growing public concern that carbon dioxide emissions are having a significant detrimental impact on the environment. In particular this has been brought to consumer's attention by various 'Food Miles' campaigns, a constant stream of climate change stories in the media and a desire by some UK supermarkets to label the carbon content of food. The NZ greenhouse tomato and capsicum industries are a mix of domestic and export market producers and have the potential, as producers of high quality high value products, to be directly affected by Food Miles and carbon footprinting requirements. Accurately determining the NZ greenhouse tomato and capsicum carbon footprints and then gaining insights into how it can be lowered is seen as essential for continued trade.

Click here to download this report.


Management Strategies for Kumara Black Rot

Summary: The kumara disease known as black rot is caused by the fungus Ceratocystis fimbriata. In recent years the black rot disease has been found more frequently. As this pathogen is highly transmittable and can cause severe economic losses within production beds, fields and storage, the disease and management strategies are described.

Click here to download this broadsheet.


Strategic Agrichemical Review Process 2007 final reports

Summary: These reports were funded by Horticulture New Zealand to investigate the pest problem, agrichemical usage, and pest management alternatives for industry groups across New Zealand. The information in these reports will assist the industries with their agrichemical selection and usage into the future.

Six SARP reports are available - brassicas, carrots, cucurbits, kumara, lettuce, and peppers.


Greenhouse Nutrient Solution

Summary: The Greenhouse Nutrient Solution project is to assist growers with the practical, sustainable and legal management of discharging greenhouse nutrient solution. All greenhouses with crops grown in soilless media will at some stage need to discharge or release excess nutrient solution. As the solution will contain nitrogen there will be the potential that the solution could contaminate water bodies. This Guide sets out what a grower needs to do to ensure that pollution does not occur when irrigating discharged nutrient solution.

Three documents are available - a Guide, a Code of Practice, and a Calculator Model. To download "A Guide to Managing Greenhouse Nutrient Discharges" click here, to download the "Code of Practice for the Management of Greenhouse Nutrient Discharges" click here, and to download the "Greenhouse Nutrient Discharges Calculator Model" click here.


Advancing integrated pest and disease management (IPM) for vegetable brassicas

Summary: The vegetable brassica industry initiated a project to update IPM for vegetable brassicas, by revising Integrated Pest Management for Vegetable Brassicas (the IPM Manual). The project objectives were to update the status of insecticide resistance in diamondback moth in New Zealand, incorporate newly registered products into the insecticide resistance management rotation strategy, and update the disease and other relevant sections in the IPM Manual.

To download a PDF of the full report click here.


Nutritional attributes of spinach, silver beet and egg plant

Summary: This report focuses on the nutritional attributes of spinach, silver beet and egg plant. The composition of these vegetables is described and related to their beneficial effects on health. Factors that may influence the nutritional profile of these vegetables and consequently their health benefits are also explored. Some quirky quotes and trivia about these vegetables are also included.

To download a PDF of the full report click here.


IPM Lettuce Final Report SFF 15 059 - 1999

Sept 2007: The Leafy Crops Advisory Group (Vegetables NZ) initiated a two-year implementation phase to transfer technology eveloped from the previous“IPM for Outdoor Lettuce” SFF project to growers and crop scouts/consultants.  The project team included key growers and industry personnel from the major lettuce-producing regions, Pukekohe, Gisborne and Horowhenua. The project work focused on crop scout training for different regions, replicated field trials, continued monitoring of small insect pests, development of action thresholds for the major insect pests (particularly caterpillar pests) and the dissemination of results in the IPM manual/guide.

 To download a PDF of the full report click here

Contributions to an understanding of sweetpotato brown centre disorder

Summary: Sometimes the interior of Owairaka Red kumara roots becomes brown and inedible due to cell death, a condition known as brown centre. Experiments conducted during the 2006/2007 growing season tested the hypothesis that brown centre is caused by excessive canopy growth and a decreasing rate of photosynthesis. When the size of the canopy is limited by other constraints, the addition of nitrogen seems to maintain the canopy's effectiveness. This reduces the need for carbohydrate remobilization from the root, so decreasing the occurrence of kumara brown centre. The association of contributing factors – particularly the relationship between sunshine hours and the time of brown centre onset is still to be proven.

To download a PDF of the full report click here.


Research Summaries

As research reports and summaries become available they will be added to this page. Keep an eye on the news section of the home page for updates.

A list of fresh vegetable research reports funded between 1994 - 2008 can be found here.