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.
With more resistance to Bt corn occurring, Iowa State University Extension recommends growers develop a long-term integrated pest management approach for corn rootworm.
The EPA has unveiled new requirements for seed-corn manufacturers as the agency addresses growing concern over rootworm resistance to single-trait Bt corn products.
In an attempt to curb further corn rootworm resistance to Bacillus thuringiensis (Bt) cornhybrids, the EPA has proposed new requirements for areas that are at risk to resistance. Its suggestions, however, may not be enough.
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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