With lower seed costs, low rootworm populations, and premiums paid on non-GMO corn, many growers are making the switch to growing non-Bt corn hybrids. Find out how scouting can help reduce the risk of transitioning.
Once again illustrating the importance of crop rotation, researchers at Iowa State University have discovered resistance to Cry34/35Ab1, which may be present in Herculex or Optimum corn traits.
For many pests, winter temperatures are an important predictor of populations the following year, but the western corn rootworm is not one of them, say experts at Purdue University Extension.
With more resistance to Bt corn occurring, Iowa State University Extension recommends growers develop a long-term integrated pest management approach for corn rootworm.
Late-harvested corn may be at risk because of western bean cutworms that have infested some fields, leaving some damaged crops susceptible to toxin-contaminated mold.
This may be the year to apply a foliar fungicide to minimize losses from disease. But only tank-mix an insecticide with it after you’ve thoroughly scouted your field.
For the past few years, folks in Pennsylvania have heard reports from Midwestern states of continuous corn growers struggling to control populations of western corn rootworms that developed resistance to some Bt corn varieties.
A journal article published recently (July 2014) confirms that rotation-resistant and rotation-susceptible western corn rootworms are affected by Bt root tissue in a similar fashion. The citation for this article is provided below.
As concern rises about rootworm resistance to Bt corn, no-tillers should employ a diverse control strategy that includes pyramided traits, crop rotation, refuge planting and adult control.
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On this episode of Conservation Ag Update, brought to you by Martin-Till, Smithville, Ga., strip-tiller and cover cropper Alex Harrell shares the main takeaway from his record-breaking 218-bushel soybean yield.
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