When clicked on, the images on this page open in a new window.
Q: Will the biocontrol insects eat my other plants?
A: No. The primary consideration in selecting
biological control agents is host-specificity. Host-specificity means that agents will only
feed and complete their development on the target plant. Only agents that are believed to have
a narrow host range are brought into the US, and then they undergo intensive screening in an
approved biological control quarantine facility to make absolutely sure that the target plant
is their only host. In quarantine, a long list of test plants, including species that are
related to the target, endangered or threatened species and economically important plants are
exposed to the candidate biological control agents in no-choice feeding conditions, meaning
that the proposed agents either feed on the test plant or die of starvation. Additional testing
is conducted to make sure that adult females of the agents will only lay their eggs on the
target plant. The historical record clearly shows that this methodology works, as there have
been no recent examples of biological control agents attacking non-target plants.