There are some good tools that are easy to access and use for producers as well as county agents and crop consultants. Several of the diseases that we see on crops in the southeast overwinter in warmer climates and migrate with weather pattern and crop maturity from south to north.
We have sites that track the movement of diseases such as southern corn rust, soybean rust and downy mildew of cucurbits. You can also see what is going on with legumes, pecans, and onions. You can go to: http://www.ipmpipe.org/ to find all of these services. Once there you will see maps that shows where diseases have been confirmed and areas that are being scouted.