Infection can also occur on the stems at the joints or nodes. Scouting Techniques Scout fields prior to flag leaf emergence. If the threshold is met in 3 of the 5 spots sampled in the field, spraying is recommended. If the threshold is met at 1 or 2 of the spots in the field, repeat scouting in about 4 days. You should consider rainfall forecasts as well as scouting information in your decision.
Heavy rainfall favours the development of severe disease.
Also, intervals between scouting can be longer if the weather is very dry. Control Tips Current varieties have limited resistance. Incorporate wheat straw by tillage in the fall or early spring in fields not prone to erosion. Use a crop rotation that includes non-cereal crops for at least one year between successive wheat crops. Use lower seeding rates and use adequate rates of fertilizer.