Louisiana Plant Pathology Series
Disease control of crown rust, stem rust, yellow dwarf and leaf blotch.
Disease control of leaf rust, stem rust, leaf and glume blotch, powdery mildew, bacterial streak/black chaff, fusarium head blight/scab, stripe rust, tan spot and yellow dwarf.
Bacterial streak is one of the most common bacterial diseases of cereal crops. The pathogen attacks wheat and other grasses. (PDF format only)
Downy mildew usually is associated with wheat plants grown in poorly drained areas. (PDF format only)
The scab fungus causes seedling blight, crown rot, root rot, stem blight and scab or Fusarium head blight in wheat. Damage to wheat from scab varies greatly from year to year and is associated with warm, moist environmental conditions that occur after wheat heads emerge. (PDF format only)
Leaf rust, also called brown rust, is caused by the fungus Puccinia triticina. This disease is widespread in Louisiana and is probably the most destructive wheat disease. (PDF format only)
Powdery mildew is not a major problem of wheat in Louisiana. In limited cases, however, the disease can reduce plant vigor, cause lodging and reduce yield, kernel size and test weight. (PDF format only)
Septoria spp. are mostly parasitic leaf-spotting fungi that attack and damage more than 100 species of small grains and other grasses. The actual damage to wheat caused by Septoria leaf blotch is difficult to measure under field conditions because more than one organism is nearly always involved in foliar infections. (PDF format only)
Stem rust, also called black rust, is caused by the fungus Puccinia graminis. Although stem rust is found in Louisiana wheat fields nearly every year, significant damage occurs only to a few isolated, late-maturing fields. (PDF format only)
Stripe rust, also called yellow rust, is caused by the fungus Puccinia striiformis. This disease is a common problem in Louisiana during cooler conditions. (PDF format only)