How safe to use is the enemy of a citrus-threatening pest?

The Asian citrus psyllid (ACP) can spread the lethal and incurable citrus disease known as huanglongbing or citrus greening that threatens the multi-billion dollar global citrus industry. In 2011, for the first time entomologists released a wasp, a natural enemy of the ACP, in a citrus grove in Riverside to help control the psyllid. But is this wasp safe to use? Does its introduction pose any risk to the environment?

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