Company web sites and marketing messages may offer conflicting or confusing information about the effectiveness or origins of their competitors’ rootworm (RW) traits.
Here are the basics.
Currently there are four genetically enhanced rootworm events available in the U.S.:
1. Syngenta’s Agrisure® RW
2. Dow AgroSciences’ (and Pioneer’s) Herculex® RW
3. Monsanto’s YieldGard® RW
4. Monsanto’s newer version, YieldGard VT® Rootworm/Roundup Ready Corn 2
All genes are a form of B.t. (Bacillus thuringiensis), but they are not all the same because they may express the B.t. protein differently in the plant.
YieldGard RW and YieldGard VT Rootworm/Roundup Ready Corn 2 are based on Cry3Bb1 genes.
Herculex RW is based on dual Cry34Ab1 and Cry35Ab1 genes.
Agrisure RW is a modified Cry3A gene, not the same as Monsanto’s gene.
All genes are effective against both variants of Western corn rootworms, both variants of Northern corn rootworms and Mexican corn rootworms.
All genes, including Monsanto’s YieldGard VT Rootworm/Roundup Ready Corn 2 are similar in activity, and simply rotating technologies will not help avoid insect resistance.
However, Monsanto says future trait technologies may help combat insect resistance and perhaps convince the Environmental Protection Agency to lower refuge requirements.
Source: Farm Journal