SOUTH-CENTRAL ND CROP SCOUT REPORT (July 5-6 and 11-12)        

 

The NDSU Extension Service annual crop scouting program in south-central North Dakota continues with emphasis on disease and insect presence in small grain. On July 5-6, 32 fields (2 barley, 2 winter wheat, 3 durum, and 25 spring wheat) were checked in LaMoure, Dickey, Griggs, Foster, Eddy, Benson, Wells, and Sheridan counties. Winter wheat was in the early-milk stage and the spring crops were in the boot to anthesis stages.  Tan spot was found in 27 of 30 of the wheat fields. Tan spot on all wheats had high incidence but low severity on the highest leaves on the plants.  The other three wheat fields showed Septoria spot blotch with high incidence but low severity. The two barley fields checked also showed symptoms of Septoria in high incidence but low severity.  Leaf rust has now shown up in all portions of the scouting area but in minimal incidence and severity in the north and 50-75 percent incidence but low severity in the south.  However, one winter wheat field in Benson county showed a 100% incidence of leaf rust with the severity at 35 percent.  Loose smut has also been observed in seven of the scouted fields with incidence from 2-10 percent.  Aphids were present in three of the fields in the south part of the scouting area.  Grasshopper pressure was not as heavy in the field margins as in past weeks.

 

On July 11-12, 28 fields (4 barley, 1 durum, 1 winter wheat, and 22 spring wheat) were checked in Barnes, Stutsman, Logan, McIntosh, Emmons, Burleigh, and Kidder counties. The crops were in the anthesis to early-dough stages.  Septoria leaf spot appeared in 14 of the wheat fields with more mature fields having higher incidence (80-100% of tillers) but low severity (1-11% of flag leaf area).  This disease is distinguishable by its little specks (called pycnidia or fruiting bodies) in the infected areas. The remaining 10 wheat fields were showing symptoms of tan spot with high incidence and moderate severity (1-22%) on the flag leaf.  Leaf rust is now progressing throughout the scouting area.  Twelve of the spring wheat fields have leaf rust while four of the spring wheat fields have stripe rust.  Stripe rust is distinguishable from leaf rust in that the pustules runs along the veins of the leaf and is also a paler orange color.  Two barley fields show signs of net blotch with higher intensity (94-100%) but minimal severity while the other two barley fields show symptoms of Septoria.  Grasshopper numbers were down compared to the previous scouting trip.  Aphids were seen in the southern part of the scouting area in four fields.

 

(Jerry Schneider)