Study

Ecological impact of three pest management systems in New Zealand apple orchards

  • Published source details Suckling D.M, Walker J.T.S & Wearing C.H. (1999) Ecological impact of three pest management systems in New Zealand apple orchards. Agriculture, Ecosystems & Environment, 73, 129-140

Actions

This study is summarised as evidence for the following.

Action Category

Convert to organic farming

Action Link
Natural Pest Control
  1. Convert to organic farming

    A replicated, controlled study in Hawke’s Bay, New Zealand in 1995-1996 (Suckling et al. 1999) found 24-58% of pest woolly apple aphid Eriosoma lanigerum colonies were parasitised by the wasp Aphelinus mali in organic orchards compared to 3-33% in conventional orchards. The wasp Dolichogenidea tasmanica parasitised 28% and 0% of leafrollers (Tortricidae) in organic and conventional apple Malus domestica orchards, respectively. The predatory mirid bug Sejanus albisignata appeared more abundant in organic than conventional orchards, but average numbers of predatory mites were similar (0.05-0.39 predatory mites per leaf overall). Woolly apple aphids were reportedly more frequent in organic (0-132 colonies/minute) than conventional orchards (0-37 colonies). In organic orchards, 59-95% of apples were undamaged compared with 90-99% from conventional orchards. Percentage fruit damage by leafrollers and woolly apple aphid in organic orchards was 1.8-4.5% and 0.002-39.6% respectively, compared with 0.1-1.2% and 0.03-11.5% in conventional orchards. Organic treatments included biological insecticide (Bacillus thuringiensis), organic fungicide, and disease control using minerals (e.g. slaked lime). Conventional orchards received 4-12 organophosphate insecticide applications and regular fungicides. Treatments were tested in 0.3-1.6 ha blocks at each of three sites.

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read latest volume: Volume 17

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust