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Availability of biological data on the agent is usually of critical importance when planning releases. For example:
 | Biological data can indicate the length of the ovipositional period and at which age maximum oviposition occurs. In general, liberation of young adults is preferable to old adults.
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| Young healthy insects reared under ideal conditions should be released. Certain species (some weevils are an example) kept confined in large breeding populations or fed low quality plant material under artificial conditions may enter a dispersal phase in which they cease breeding and develop flight muscles. The consequences of liberating non-breeding or delayed-breeding insects are obvious.
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| The agent's climatic preferences may make it necessary to adjust the time of release to match the most favourable season. |
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Tony Wright
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