The NDSU Extension Service annual crop scouting program in south-central North Dakota continued this past week with the emphasis on disease and insect presence in small grain. On July 17-20, 32 fields (2 barley, 2 winter wheat, 2 durum, and 26 spring wheat) were checked in LaMoure, Dickey, Griggs, Foster, Eddy, Benson, Wells, and Sheridan counties. Winter wheat was in the early- to mid-dough stage and the spring crops were in the anthesis to early-milk stages.  Tan spot was found in 14 of 30 of the wheat fields. Tan spot on all wheats had high incidence but low to moderate severity (0.5-28%) on the highest leaves on the plants.  One of the wheat fields scouted had a 66% tan spot severity on the flag leaf but is far enough advanced not to cause a problem.  The 16 wheat fields showed Septoria spot blotch with high incidence but low to moderate severity (1-22%). The two barley fields checked also showed symptoms of Septoria again in high incidence but low severity.  Leaf rust has now shown up in all but one of the spring wheat fields in the scouting area.  This disease is at moderate to high incidence levels in the south and lower incidence levels in the north. Severity levels have been from 1-22% in the south to 1-4% in the north.  However, one winter wheat field in Benson county showed a 100% incidence of leaf rust with the severity at 55 percent.  Scab is now visible in 10 fields in the area but in low levels (2-8% incidence & 7-42% of the head).   Loose smut has also been observed in 16 of the scouted fields with incidence from 2-10 percent.  Aphids were present in four of the nine fields in the south part of the scouting area.  Grasshopper pressure was not as heavy in the field margins this past week.  Also, due to the heavy rains over the past week, many of the fields are now lodging.


(Jerry Schneider)