Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001753
11/12/99
Iris Borer
The insect overwinters on old leaves or debris as eggs.
The eggs hatch in the spring when the leaves are about 6
inches tall. The young larvae burrow into the leaves.
The and eventually bores into the rhizomes. The insect
pupates in the soil or the rhizomes and the adult moth
emerges in late summer to lay eggs.
One of the most visible symptoms is poor growth. However
the insect often introduces bacterial soft rot which will
cause a foul smelling rot.
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This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
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