Spirit Lake, IA (KICD) — The Iowa Department of Natural Resources will apply another round of herbicide to the Curly Leaf Pondweed that has infested some areas of the Iowa Great Lakes. Fisheries Biologist Mike Hawkins says it’s actually a good time of the year to target the pest.

Winter treatments are different than other times of the year.

A winter treatment on the North Bay of East Okoboji two years ago seemed effective.