Pest Resistance Threatens Corn Industry's Newest Biotech Defense, Study Warns

Sep 25, 2025

By Rosemary Brandt

Corn rootworms, pests responsible for billions of dollars in yearly crop losses, are evolving resistance that weakens even the latest biotechnology controls, according to a new study published in the journal Proceedings of the National Academy of Sciences.

Drawing on decades of data across multiple states, University of Arizona entomologists found that field-evolved resistance to Bacillus thuringiensis, or Bt, is undermining the effectiveness of corn that targets rootworms with the combination of Bt and RNA interference, or RNAi, a new biotech control that turns the rootworms' own genetic instructions against them.

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Video: Winter Canola Trial in Mississippi | Can It Work for Double Cropping? | Pioneer Agronomy

Can winter canola open new opportunities for growers in the Mid-South? In this agronomy update from Noxubee County, Mississippi, Pioneer agronomist Gus Eifling shares an early look at a first-year winter canola trial and what farmers are learning from the field.

Planted in late October on 30-inch rows, the crop is now entering the bloom stage and progressing quickly. In this video, we walk through current field conditions, fertility management, and how timing could make this crop a valuable option for double-cropping soybeans or cotton.

If harvest timing lines up with early May, growers may be able to transition directly into another crop during ideal planting windows. Ongoing field trials will help determine whether canola could become a viable rotational option for the region.

Watch for:

How winter canola is performing in its first season in this Mississippi field

Why growers chose 30-inch rows for this trial

What the crop looks like as it moves from bolting into bloom

Fertility strategy, including nitrogen and sulfur applications

How canola harvest timing could enable double-cropping with soybeans or cotton

Upcoming trials comparing soybeans after canola vs. traditional planting

As more growers look for ways to maximize acres and diversify rotations, experiments like this help determine what new crops might fit into existing systems.