If you have selected a reliable and knowledgable supplier of natural enemies, then the quality of material you receive should be consistently high. However, there are some factors, such as shipping conditions, that are out of the suppliers control. Like all living organisms, natural enemies have specific requirements and limits for life. The conditions present in the area you plan to release natural enemies in should be taken into consideration prior to making releases. For example, some species of predatory mites will do better under hot, dry conditions while still others will perform better under cooler high humidity conditions.
Lighting can also have a dramatic impact on natural enemies.
For example, the mealybug destroyer beetle will slow or stop its reproduction, feeding and growth if supplemental lighting is not sufficient in winter months. The presence of pest insects will also encourage reproduction, and reduce the likelihood that they will leave the area. Pesticide use may be the most important consideration when including natural enemies in a pest management program. Spraying for pests other than those being targeted by natural enemy releases may interfere with or eliminate the natural enemies. Care should be taken to avoid spraying materials harmful to natural enemies directly before, during and after release.