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The Western corn rootworm, Diabrotica virgifera virgifera, is one of the most devastating corn rootworm species in North America, especially in the midwestern corn-growing areas such as Iowa. A related species, the Northern corn rootworm, D. barberi, co-inhabits in much of the range and is fairly similar in biology.
Western corn rootworm. The western corn rootworm (WCR) adult is ¼ inch long and has a yellow body with three black stripes that do not extend to the tip of the abdomen. Male and female WCR can often be distinguished by the striping on their wings: females generally have distinct stripes while males can look like a black smudge.
Two species of rootworms that may cause severe damage to corn as both larvae and adults, are the western and northern corn rootworms. Their damage is typically more likely in continuous corn.
Western corn rootworm, Diabrotica virgifera virgifera, is one of the most devastating corn insect pests in the United States. In some years, corn rootworms can cause up to $1 billion in yield loss and control costs.
Western corn rootworms are native to North America and were considered minor corn pests until continuous corn production was implemented in the Midwest about 50 years ago. Without a non-host crop rotation, corn rootworms are able to build to damaging levels and cause severe yield loss.
The western corn rootworm (WCRW) and northern corn rootworm (NCRW) are the most destructive species found throughout the Midwestern U.S. and Canada. Adult emergence begins in early to mid-July with male beetles emerging before females. Evaluate fields for silk clipping.
Western and northern corn rootworms are present the Piedmont and Mountain regions of North Carolina, although western corn rootworm adults have also been detected in the Coastal Plain as far east as Martin county. These insects are the most important insect pests of corn in the Mid-West.
Western corn rootworm has adapted to crop rotation by modifying its behavior during oviposition. Female adult western corn rootworms that are soybean-variants will lay eggs in both soybean and cornfields.
The origin of western corn rootworm has been traced to Guatemala in Central America, where they were pests of corn for thousands of years. It has been in the western Great Plains since the late 1800s but was not considered a pest until it caused noticeable damage to corn in Colorado in 1909.
It includes two subspecies, Diabrotica virgifera virgifera (the western corn rootworm) and Diabrotica virgifera zeae (the Mexican corn rootworm). [2] Diabrotica virgifera virgifera. References This page was last edited on 17 December 2023, at 20:05 (UTC). Text is available under the Creative Commons ...