1.   Although bronze fennel is grown mostly for its foliage and is a self-seeding nuisance, let some flower to attract parasitic wasps.

2.   At left, Ronald Vargas sorts parasitic wasps.

3.   Also, researchers at the University of Massachusetts at Amherst are studying how parasitic wasps can be used as tiny guided missiles to kill ticks.

4.   But what should gardeners do to safeguard their lilies while waiting for the parasitic wasps to arrive on the scene?

5.   For example, Dr. John Werren, an evolutionary geneticist at the University of Rochester, studies parasitic wasps that lay their eggs on caterpillars and other insects.

6.   In some parasitic wasp species, the mother will lay several eggs in a host.

7.   Parasitic wasps also are being used to combat the eucalyptus borer beetle.

8.   Sakai and Marriott believe the best explanation may lie with a parasitic wasp and a deadly disease that strikes only monarchs.

9.   Soon, tiny parasitic wasps raised in captivity by the university were on their way to Clewiston to be released in the groves to conquer the psylla.

10.   Some ladybugs and parasitic wasps are natural predators.