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Larvae inhabit springs and streams , living under rocks , and feeding on the larvae of other salamander species . The catalpa — whose name derives from Catawba , the Indian tribe that used the leaves as a poultice for treating wounds — is also known as “ Indianbean , ” “ cigar tree , ” and , particularly in the South , “ worm tree ” for the larvae of a sphinx moth , which feed on the enormous , heart-shaped leaves and are prized as bait for sunfish . Woodpeckers search for the larvae , but the number they destroy does not substantially limit the borer population . Since the larvae live on the lake or river bottom , they are more difficult to kill than the biting mosquito larvae that live on the water surface . The expression resulted in a significant insecticidal activity of transgenic brinjal fruits against the larvae of fruit borer ( Leucinodes orbonalis ) . In the present two cases the mud snail and the marsh periwinkle are suitable and numerous , offering quickly available hosts for the larvae to penetrate . Extensive research has been carried out on the use of insecticides against the larvae and adults of blind mosquitoes . The predominant parasites seem to be the braconid wasps , which drill through bark or stems to lay their eggs inside the larvae . The time required for the larvae to complete their development varies from a few months to several years , depending on the species and the availability of food and moisture in the wood .