A New Wrinkle in Iris Borer Control
An overview of the Iris borer problem in species and hybrids with surface rhizomes along with the accepted treatments and the latest research on a safe, biological method of controlling the pest. Now that it's August, it's time to do the Iris ... [... more]
Suite101 |
Iris Borers
Iris borer caterpillars (Macronoctua onusta) are the most destructive insect pests of iris. The pinkish caterpillars are two inches long when full grown. Adult moths have chocolate-brown front wings and lighter yellow-brown hind wings with a wing ... [... more]
extension.umn.edu |
Variegated Iris
Perennial profile: Variegated Iris Pictured: Iris pallida 'Variegata' Aphids, Iris borer, and thrips. Plant in full sun to partial shade, in fertile well drained soil. Space new container grown plants 18" - 36" apart. Adapts to most soil types . [... more]
Denver Plants |
Iris Borer
Full grown caterpillars are cylindrical, smooth, and measure up to 1 3/4" long. Pupae are dark brown to nearly black and quite shiny. Adult moths have a wing spread of 1 1/2-2 inches. The wings are covered with scales, purplish brown on the front ... [... more]
Virginia Tech Extension |
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 ... [... more]
Old House Web |
Iris Diseases
Bacterial soft rot enters plants through wounds caused by the iris borer. Infected leaves have a watersoaked appearance. Healthy leaves fall over when the rhizomes rot. Rotting rhizomes have a foul odor. Cut off leaves showing the water soaked ... [... more]
Old House Web |
Iris Insects
Aphids may be controlled with applications of Diazinon dust or sprays of Sevin or rotenone. The iris borer is the most serious insect pest. They overwinter as eggs on debris. The larvae enter the leaves when the leaves are 5 to 6 inches high and ... [... more]
Old House Web |
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