Single-gene resistance to rust and anthracnose may be available in a few hybrids. Most hybrids do not have much resistance to southern rust. Some companies publish ratings for some of these diseases. Corn stalk rots . Resistance is usually polygenic.
Hybrids differ but all have some resistance to stalk rots.
The stalk rating or lodging score is related to general stalk rot resistance or tolerance, but it is not a direct measure of resistance to infection. Many factors affect the stalk rating of a hybrid, including its partial resistance to the major stalk rot pathogens. Stress tolerance also affects stalk rot occurrence in hybrids. Major genes for anthracnose resistance have been reported but are not widely available. Corn ear rots .