Start Date

2-12-1999 12:00 AM

Description

Northern com rootworm larvae occasionally damage fields of first-year com in Iowa. Rootworms typically have a one-year life cycle and rotating com with another crop has been a very successful management strategy to prevent lodging and yield loss from this insect. Unfortunately, some populations of the northern com rootworm have successfully adapted to the com-soybean rotation and now have a two-year life cycle. This two-year life cycle is called extended diapause because some of the eggs remain dormant in the soil for nearly two years before the larvae hatch. For instance, for the eggs that are laid in 1999, some larvae will hatch in 2000, but the remainder will not hatch until2001.

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Dec 2nd, 12:00 AM

Northern Corn Rootworm Damage in First-Year Corn: A Review of the Situation in Iowa

Northern com rootworm larvae occasionally damage fields of first-year com in Iowa. Rootworms typically have a one-year life cycle and rotating com with another crop has been a very successful management strategy to prevent lodging and yield loss from this insect. Unfortunately, some populations of the northern com rootworm have successfully adapted to the com-soybean rotation and now have a two-year life cycle. This two-year life cycle is called extended diapause because some of the eggs remain dormant in the soil for nearly two years before the larvae hatch. For instance, for the eggs that are laid in 1999, some larvae will hatch in 2000, but the remainder will not hatch until2001.

 

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