Pathogen(s) causing disease:

Puccinia striiformis

Symptoms:

Long stripes of small yellowish orange pustules appear on the leaves. These pustules consist of masses of rust spores. It can sometimes be confused with leaf rust or stem rust. Stripe rust also goes by the name of yellow rust because it is a slightly lighter color than leaf rust or stem rust.

Conditions:

Infection occurs from 0 to 25 C, with free water on the leaf and may occur beneath the snow. During hot or dry periods sporulation ceases but will often restart with a return to cool moist conditions. Hot summers and dry seasons are most threatening to stripe rust survival. Wheat is the only significant host of the stripe rust fungus.  

Stripe rust over-summers on volunteer wheat. In the fall and winter it may develop in the southern U.S. near the Gulf coast on newly seeded wheat.  In the spring, rust spores may blow north to the Central Plains. It is favored by cool, humid weather. Disease development is most rapid between 50 and 60 F. The disease is inhibited when night time temperatures get above 65 F or we have several days in a row in the mid 80's.

Management:

Control of stripe rust is through use of resistant varieties.

Sources:

Kansas State University
USDA ARS