01460naa a2200157 a 450000100080000000500110000800800410001910000170006024500810007726000090015852010220016765000110118965000120120070000180121277300720123018353302013-08-19       1969    bl ---       0--  u    #d1 aCLARK, R. V.  aSeed infection of barley by Cochliobolus sativus and its influence on yield.  c1969  aYield losses from planting barley seed heavily infected with Cochliobolus sativus were not significant at the normal planting rate. Seed infection reduced seedling emergence by up to 38% in the field, but the reduction in number of plants per row had to be more than 50% of the control before significant yield decreases occurred. Treatment of the seed with mercury fungicides eliminated the reduction in emergence caused by C. sativus and also provided an additional increase, due possibly to protection from other soil microorganisms, but there was no significant improvement in seed yields. Treatment of the seed improved kernel weight slightly. Only a few plants grown from infected seed became infected by the causal organism undw normal greenhouse conditions. When they were grown under conditions of high humidity, however, almost as many plants were infected as there were infected seeds. Disease development on plants in high humidity was controlled by treatment of the infected seed with mercury fungicides.  aCevada  aDoença1 aWALLEN, V. R.  tCanadian Plant Disease Survey, Ottawagv. 49, n. 2, p. 60-64, 1969.