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Release of agents at some sites, but not others, allows the impact of the agents to be assessed by comparing performance of plants at the
release and no-release (control) sites.
The advantage of controlled releases is that:
 | results may be applicable at a landscape scale. |
The disadvantages of controlled releases are that:
| rapid migration by the agents may result in invasion of controls; |
| geographical constraints can make statistically valid allocation of release and control sites extremely difficult, if not impossible. |
Political support for this method may be necessary to withstand pressures for early release of the agents at all sites, including the control areas.
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Grant Farrell and
Mark Lonsdale
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