For many years Dr. Christine DiFonzo at Michigan State University has produced a concise 2-page guide to Bt traits in corn. This iconic publication details the events (toxins), insects controlled and refuge requirements for all Bt corn sold in the northern corn belt. The original 2015 version for the corn belt can be used in the northern Panhandle (see map below). Now Chris has made a version for the "cotton zone" in Texas and other southern states where we have different and often larger refuges than in the corn belt.
If you have questions about Bt corn then this is the perfect place to start, and we are pleased to post Chris DiFonzo's 2015 Handy Bt Trait Table for The Southern Cotton Growing Region. Please note that any questions or comments should be directed to either Pat Porter (Lubbock, firstname.lastname@example.org) or Ed Bynum (Amarillo, EBynum@ag.tamu.edu).