Jeff Housman, district agronomist, Mycogen, advises farmers to get out and walk corn fields to scout for corn rootworm damage. He says to start digging roots and evaluate them for corn rootworm pressure. "Management strategies are key," says Housman....More
Some cornfields in Iowa are now silking, and even though we had a longer planting period than usual, most will be well into reproductive stages shortly. Tristan Mueller, ISA On-Farm Network program manager, says now’s the time to be watching your fields for adult corn rootworm beetles....More
Corn & Soybean Digest editor Kurt Lawton went on a root dig this week on a northeast Iowa farm. He explored a Mycogen rootworm test plot with district agronomist Jeff Housman. Check out these scouting tips for corn rootworm damage on roots as well as silks. Housman estimated a 40-50-bu. loss in this test plot based on early indications of rootworm severity.
While there are traits and products to help you protect your corn crops against corn rootworm, you still need to manage against the pest and that means knowing about larvae and adult beetle populations in your fields. According to experts from DuPont Pioneer, scouting corn fields to keep tabs on rootworm populations is essential to protecting your corn crop against rootworm damage....More
Corn growers need to scout their fields to determine wireworm populations before planting so they don't miss the optimum treatment window, says Christian Krupke, a Purdue Extension entomologist....More
The Japanese beetle is becoming an increasingly prevalent pest in the north-central region of the United States and can occasionally be an economic problem in soybean or corn fields, says Kelley J. Tilmon, South Dakota State University Extension soybean entomologist. For clarification purposes, Tilmon wants to ensure that readers do not confuse the Japanese beetle with the Asian ladybeetle, which is often called Japanese beetle by mistake....More
The wily western corn rootworm thrives in fields where farmers choose a risky combo of continuous corn and continuous use of the Cry3Bb1 trait found in Monsanto's YieldGard RW and VT Triple products....More
If you lack focus below the soil, on your crop root environment, then these critical plant pathways won't efficiently transport water and nutrients into place for top yields. To build healthy roots, start with the basics, suggests Bruce Potter, integrated pest management specialist, University of Minnesota Southwest Research and Outreach Center....More
A new study answers a question that has baffled researchers for more than 15 years: How does the western corn rootworm – an insect that thrives on corn but dies on soybeans – persist in fields that alternate between corn and soybeans? The answer, researchers say, has to do with enzyme production in the rootworm gut. Their findings are described in a paper in Ecology and Evolution....More
The western corn rootworm season is progressing at an unprecedented pace, reports University of Illinois Professor of Entomology and Crop Sciences Extension Coordinator Mike Gray. Reports of severe injury to Bt corn that expresses the Cry3Bb1 protein targeted against corn rootworms have come in from western Cass County. In 2011, similar reports of injury to Bt hybrids expressing this protein surfaced in other north-central states, particularly in Iowa....More
University of Illinois Professor of Entomology and Crop Sciences Extension Coordinator Mike Gray says that this year it is important to keep a watchful eye out for the two-spotted spider mite, especially as we head into some very hot and dry weather in the near term. “Because we are well ahead of schedule this spring regarding the occurrence of several pests, we should definitely scout for two-spotted spider mites, particularly if we continue to have hot and dry weather,” says Gray. “Let’s hope we don’t have issues with this pest in 2012.”...More
Managing corn rootworm is a challenge for farmers. However, using best management practices and understanding your fields is key to keeping the pest under control, says Luke Samuel, corn insect traits product development manager, Monsanto. Samuel suggests that farmers in high-pressure areas, especially, use rotation, dual modes of action or single modes plus insecticide to manage corn rootworm....More
We are receiving numerous reports right now about slugs causing significant feeding injury requiring treatment with baits. These reports are two to four weeks early compared with most years, and is a result of the warmer winter and March. Slugs have attached out earlier than normal and have reached a size that causes noticeable feeding injury much sooner....More
Corn farmers should begin scouting their emerging corn seedlings for signs of leaf feeding and cutting by black cutworms, according to Kelly Estes, coordinator of the Illinois Cooperative Agricultural Pest Survey. Significant moth flights in late March and early April could have caused a significant presence of cutting-stage larvae in many areas of the state in the coming weeks....More
The spring migratory flight of black cutworm moths remained impressive across Illinois and the Corn Belt through mid-April according to University of Illinois Professor of Entomology and Crop Sciences Extension Coordinator Mike Gray. Dale Baird, University of Illinois Extension, reported capturing 23 moths in his pheromone trap over a two-day period (April 14-15) in northern Illinois (Lee County), well above the intense capture threshold of nine or more moths over a one- to two-day time frame....More
Starting in 2009, the Department of Entomology at Iowa State University received reports of severe corn rootworm injury in Bt corn in Iowa. In all cases, western corn rootworm was the predominant rootworm species in these fields....More
Isolated findings of resistant rootworms in Iowa emphasize that planting a refuge is more critical than ever for maintaining the durability of Bt corn, says Christian Krupke, a Purdue Extension entomologist....More
In the mad rush to finish up what has been a challenging corn planting season, speed often takes priority over attention to detail, says Robert Bellm, University of Illinois Extension crop systems educator....More
Reports of late planting, flooding and saturated soils are inundating news sources right now, and corn growers need to take them seriously. All of these conditions will likely have an effect on which pests and diseases show up in your cornfields. Extension specialists advise keeping a close eye on crops as they emerge....More
Corn farmers who might have hoped that a new insect threat would be slowed by this winter's frigid temperatures could be disappointed, says Christian Krupke, a Purdue University Extension entomologist....More
Corn silks and soybean foliage are on the menu for Japanese beetles. And Eric Maupin is making sure they don’t get to order.
Maupin, who grows corn, soybeans and wheat in Newbern, TN, sometimes battles earworms, stinkbugs and other insects. He scouts every field to determine infestation levels and chooses the right insecticide for the situation. He’s ready for one of the newest insects to start invading western Tennessee....More
Justin Turner doesn’t plan on a fight with fall armyworms in soybeans every year. But he knows he’d better be ready to rumble if they invade.
Turner farms in northeast Louisiana at MerRouge. His soybean and corn rotation can face excessive insect infestations if control measures aren’t taken in the warm, humid and wet climate that often sees heavy fall rains. And if fall armyworms (FAW) strike, they’d better be controlled before they can chomp away at leaves and eventually defoliate a field....More