A lot of our work is directed at finding ways of operating
large-scale agricultural industries with minimal or no use of
chemicals. Agriculture here is taking consumer demand for greater
health assurance very seriously, so funding for this kind of research
is quite significant by NZ standards. Substantial changes to
agricultural practice are being made, especially in horticulture, and
increasingly these changes are being driven by the marketing boards
which coordinate most of New Zealand's agricultural exports.
A theme of our work is that sustainable farming usually requires more
effort (physical and mental) than conventional farming, and
consequently can be limited by the availability of human resources.
The role of engineers is to make human resources go further by
developing helpful tools and processes. Often our aim is to find a
way of turning an uneconomic ideal into an economic reality.
My group's current interests in the sustainable ag field include:
Non-chemical fruit disinfestation
Non-destructive high-speed grading of individual fruit for
sweetness, defects and insect infestation
Use of beneficial fungus and fungal extracts for control of undesirable
fungal infections
Practical use of pheromones for insect control (eg mating disruption)
Non-spray herbicide application technology for control of rampant vines and
trees (eg stream-blocking willows)
Minimal-chemical weed control
Automatic trapping for control of pest animals (a serious problem in
New Zealand - our ancestors imported a lot of small animals but not
the predators to keep them in check)
Objective measurement of stress in free-ranging animals and during
transportation
Creation of micro-environments with shelter and reflective foils
Minimizing use of insecticides and fungicides in large-scale production
of exportable fruit
Simple controlled-release systems for disease prevention in livestock
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Rod McDonald
Engineer/scientist
Horticulture and Food Research Institute,
Hamilton, New Zealand
Phone +64-7-8385675 work, +64-7-8552019 home, Fax +64-7-8385655
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