By Pierce Paul and Dennis Mills, Ohio State University Extension
We have received several reports of bleached wheat heads in fields across the state. The distribution of symptoms in the affected fields ranges from individual bleached heads scattered throughout the field to huge sections of fields or entire fields with bleached heads. Timing of symptom development ranges from one to three weeks after flowering. In some instances, bleached heads are empty (blank). Such a wide variety of patterns and symptom characteristics is causing considerable confusion among producers as to whether they are dealing with head scab or some other problem. Scab does indeed cause bleached heads, but it is not the only cause of this type of head disorder. Along with head scab, take-all, hail, frost, flooding, and injuries caused by insects (wheat stem maggot) may all lead to bleached or white discoloration of wheat heads.
Useful information to help you determine whether you are dealing with scab include 1) the weather condition shortly before and during flowering, 2) the timing of symptom development after flowering, 3) the bleaching pattern on the head and the plant, and 4) the distribution of affected heads in the field.… Continue readingRead More »