South Dakota ranks among the top
ten barley-producing states in the US with 49,000 acres under cultivation, up
63% from 2021 (NASS 2022). While most of the cultivated barley feeds livestock,
some of it goes to the brewing industries. The major threat to barley
cultivation comes from Fusarium head blight disease (FHB, Scab), caused by the
fungal pathogen Fusarium
graminearum. FHB reduces the yield and quality by contaminating the
produce with mycotoxins like deoxynivalenol (DON), negatively affecting the consumption
of both Wheat and Barley worldwide. The most efficient way of controlling FHB
is through imparting host resistance. Therefore, the first objective of our
research is to screen spring barley cultivars against FHB disease. Winter
hardiness in barley is a desirable trait that can provide South Dakota growers
with an alternative to include barley in the crop rotation scheme. Barley, when
included in the corn-soybean-small grain-cover crop rotation during winters
reaps good returns to the growers while improving soil health and reducing the
need for herbicide application. The second objective of our research is to
identify winter hardy and FHB-resistant barley lines, which will provide both
yield and sustainability benefits to the barley producers. We conducted field
trials to test the FHB resistance of 23 and 29 winter barley lines and spring
barley lines respectively. Out of the 23 winter barley lines received from
different states of the United States, only 6 lines survived the winters of
south Dakota. The 29 spring barley lines were planted in four replicates in a
randomized complete block design and were spray inoculated at 50% anthesis
stage with a virulent strain of Fusarium
graminearum. The disease severity was rated by scoring the visible
symptoms on heads at 21 days and 28 days after inoculation. At 21 days, the
mean disease severity for the majority of the lines was below 40%, whereas at
28 days, two spring barley lines S2M196 and S2M197 performed significantly
better exhibiting less than 40% severity in each block. The spring and winter
barley samples will be proceeded for DON and FDK analysis. Our results show
that variability for FHB resistance exists in the germplasm. Growers can make
sound decisions by selecting moderately resistant to resistant varieties along
with fungicide application against FHB as a disease management strategy.