Plant & Food Research scientists and collaborators from the USA have compiled more than 30 years of field-based data from kiwifruit research to create “digital twins” of pollination processes in kiwifruit orchards, and have used these to predict how growers can optimise their fruit set.

Digital twins are virtual replicas of physical systems – in this case mathematical models of the biology of the plants and the behaviour of pollinating bees. These digital twins give researchers the ability to examine complex scenarios which examine multiple, intertwined factors at once. These types of trials are difficult or impossible to test in field – running a full combination of even six variables would require more kiwifruit orchards than exist in New Zealand.

Using this digital twin, the researchers predict that optimal fruit set is achieved with 60-75 % female flowers in the orchard; something that growers can achieve by select pruning of male flowers. Most pollination benefit is gained from the first 6-8 honey bees/1000 flowers, with diminishing returns thereafter. The research suggests that fruiting success is more sensitive to variation in plant traits and the female-to-male flower ratio than bee density, provided this minimum density is achieved.

Dr David Pattemore, pollination scientist at Plant & Food Research and leader of the research team, says, “This digital twin allows us to achieve something we couldn’t have done before – simultaneous testing of the plant-based factors and the pollinator-based factors. It now provides us with a platform to test many more questions and develop recommendations for growers that can be confirmed in field trials.

“The prediction should give kiwifruit growers confidence that what they have been practicing is more or less on the right track. The model provides strategies for improving crop management, such as selection of male and female cultivars which have their peak bloom at the same time, establishing the right balance of female to male flowers in the orchard and placing the sufficient numbers of hives to maintain more than 6 bees per 1000 flowers in the orchard to optimise yield.”

The project is part of a wider programme to develop digital twins for pollination, using a range of different modelling approaches to investigate how different pollination factors interact and influence kiwifruit production. Although initially designed to investigate honey bees pollinating kiwifruit vines, the models can be adapted to suit a wide range of crop species and pollinators. The team is currently working to scale up the model to investigate more complex questions such as the influence of diverse pollinator species and the effect of the spatial layout of orchards. These digital twins could potentially be used as the foundation for the development of decision support tools for growers, to guide their orchard and pollination management to optimise yields.

The paper titled “Orchard layout and plant traits influence fruit yield more strongly than pollinator behaviour and density in a dioecious crop” has been published in PLOS.

Consumers across the world may soon be experiencing tastier, fuller-sized blueberries year-round, thanks to a new breeding partnership in blueberries that will bring premium quality berries to customers across the world.

Plant & Food Research and global fresh produce company T&G Global have announced they are entering into a new agreement to breed and commercialise exciting new varieties of blueberries to be sold globally.

The breeding programme will produce new varieties of blueberry that will provide improved yield and resistance to disease while also delivering consumers larger, tastier berries over a longer period, with an extended harvest season.

The first new commercial varieties could be launched globally in the next 12 months under T&G Global’s Orchard Rd brand.

“Blueberries are a key strategic play for us in building our global portfolio, and we’re delighted to build another global category to emulate the success of our premium apple brands. We know there is strong consumer demand for blueberries and teaming up with Plant & Food Research means we get access to a pipeline of world-class varieties,” says Gareth Edgecombe, CEO of T&G Global.

“Securing exclusive rights to the best varieties is the first step in our strategy to build multiple global verticals that drive and enable value and add demand through strong consumer brands,” he says.

The new partnership builds on an existing agreement that grants the global fresh produce grower and marketer, T&G Global, access to a suite of Plant & Food Research-bred and licensed blueberry varieties for production in Australia.

“Plant & Food Research and T&G Global have a strong relationship that began at their legacy organisations in the 1990s,” says David Hughes, CEO Plant & Food Research.

“T&G has an excellent track record of commercialising our varieties, most notably the apples branded JAZZ^™ and Envy^™. We are looking forward to continuing building on this history and delivering excellent blueberries for New Zealand and global consumers,” he says.