Buzz around pollinators

Feral honey bees – European bees which have escaped from hives into the wild – are surprisingly useful in Australia. They pollinate over 70% of crops that require pollination, like apples, pears, lucerne, melons, berries, canola. But with Varroa mite, a blood-sucking pest of bees, decimating the feral honey bee population globally, and set to invade Australia in the near future, what can be done to maintain pollination services?

Key components of the problem are to understand which bees, including over 1000 native Australian species, can pollinate which crops, and could potentially be used as alternative/supplemental pollinators in the future. A second component is to understand which plants naturally support the most useful pollinators and to understand how we can plant designed landscapes around dependent crops to naturally build up pollination services.

In dollar terms, native pollinators alone are estimated to contribute $2.5 billion in crop pollination, and that an increase in pollination activities from this source will lead to higher farmgate returns.

But like humans, bees need a varied diet, so, in the case of bees, pollen and nectar from a range of flowers. Crops sometimes only provide one-sided nutrition and when they finish flowering, there is often very little alternative food for pollinators present in the landscape. We need to improve the landscape to secure pollinator populations and their crop pollination services.

Several global initiatives aim to increase native pollinators in gardens

It’s good news then that a new project, ‘Securing Pollination for More Productive Agriculture’, is tackling these issues and has received $5.2M support from the R&D for Profit programme through the Australian Government’s Department of Agriculture and Water Resources.

The project brings together Australia’s most knowledgeable bee and pollination researchers to assess the contribution of pollinators to nine Australian crops (apples pears, lucerne, almonds, canola, melons, blueberries, raspberries, mangoes), and to investigate re-establishing native vegetation to support pollinator food and nesting resources, and use new technologies to communicate the findings to farmers.

Four sub-projects are being carried out and managed by AgriFutures Australia, and co-funded and delivered by the University of Adelaide, Australian National University, University of New England and University of Sydney.

The component of work carried out by the University of Adelaide and working with South Australian industry groups, is helping farmers and growers design and implement native plantings to support bee and other insect populations needed to pollinate their crops and orchards.

This is the first such project in Australia – expected to be a win-win for both growers and biodiversity, with enhanced productivity through improved pollination and increased biodiversity through revegetation with native plants.

We know that crop pollination can be improved by revegetation on or around farms that support pollinators. It’s a strategy used in major horticultural regions in Europe and the US, but not yet widely promoted in Australia.

Flowering raspberries being pollinated by hived and native bees
Native habitat supporting pollinators at a Costa farm in Coffs Harbour

I’ve seen the success of this practise first hand. Last week I was up in New South Wales at the Costa groups farms in Coffs Harbour, as part the project steering committee meeting. Costas grow raspberries and blueberries on land surround by native vegetation. The raspberries were in full flower when I visited and in addition to the hived bees on the site, there were hundreds of native bees pollinating the raspberries from the surrounding vegetation.

An important outcome of the project will be planting guides and a web-based tool which will enable users to map vegetation plantings around their crops that will provide the best habitat for pollinators in order to maximise productivity gains. The project is a great example of how innovative thinking can improve productivity and sustainability in cropping and food.

Initial research work has already begun including experiments to assess pollination deficits in apple orchards and pollinator habitats in the Adelaide Hills, as well as pollination fieldwork with the blueberry and raspberry sectors in New South Wales.

This project is supported by AgriFutures Australia, through funding from the Australian Government Department of Agriculture and Water Resources as part of its Rural R&D for Profit programme, as well as Horticulture Innovation Australia, University of Adelaide, University of New England, University of Sydney, Australian National University, Adelaide and Mount Lofty Ranges NRM Board, Almond Board of Australia, Apple and Pear Growers Australia SA, Australian Mango Industry Association, Australian Melon Association, Costa, Department of Environment Water and Natural Resources SA, Greening Australia, Lucerne Australia, Native Vegetation Council, Natural Resources Management Board – Northern and Yorke (SA), O’Connor NRM, Primary Industries and Resources SA, Raspberries and Blackberries Australia, SA Australian Apiarist Association, Terrestrial Ecosystem Research Network and Trees for Life.

The research and industry partners bring an extra $7.7 million of cash and in-kind support to the project.


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