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Have Corn Rootworm Eggs Hatched Yet in Wisconsin? – Not yet
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Location: Blogs Wisconsin Crop ManagerInsects and Mites |
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| Posted by: WCM Staff |
5/8/2008 1:48 PM |
This spring, ZedX, Inc. is providing our UW Madison Extension field crop entomology program with statewide soil temperature updates and estimated corn rootworm hatch and larval development progress.
Have Corn Rootworm Eggs Hatched Yet in Wisconsin? – Not yet
Eileen Cullen, Field Crop Extension Entomologist
Western and northern corn rootworms overwinter as eggs in the soil. Corn rootworm begins development at 44F and hatches from overwintering eggs typically in early to mid-June at 800 degree days. One generation occurs per year in Wisconsin and the North Central Region. Larvae pass through three instars as they feed on corn roots. Peak feeding occurs for several weeks after hatching (between 1300-1700 degree days) and pupation occurs in mid-July. Adults emerge 5-10 days after pupation. Emergence is observed from mid-July to mid-August between 1800-2200 degree days. Egg laying begins two weeks after adult emergence and adults remain active until the first killing frost. Western corn rootworm generally completes development 4-5 days before NCR.
This spring, ZedX, Inc. is providing our UW Madison Extension field crop entomology program with statewide soil temperature updates and estimated corn rootworm hatch and larval development progress. ZedX, Inc. provides data and decision support tools to the agricultural sector, specializing in weather data and crop pest phenology models http://www.zedxinc.com/index.php.
I will provide updated corn rootworm hatch maps for WI relative to the North Central Region as soil temperature heat units accumulate between now and June through larval development stages. Figure 1, current through May 8th shows western corn rootworm egg hatch has not yet begun in WI. Western corn rootworm is the predominant species in most of WI. While northern corn rootworms also occur in WI, the western corn rootworm hatch map can be used for a state estimate of corn rootworm overwintered egg hatch and larval development (western and northern). Southern states in the Corn Belt are starting to record 1st instar development as evidenced by the light brown coloration beginning to appear at the bottom of the regional map in Figure 1.
Figure 1. Western corn rootworm overwintered egg hatch map. May 8, 2008.
References
O'Day M, Becker A, Keaster A, Kabrick L, Steffey K. 1998. Corn Insect Pests- A Diagnostic Guide. Missouri University Extension Publication 166.
Pedigo LP. 1989. Entomology and Pest Management. Macmillan Publishing Company. New York, New York. |
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