Barley Yellow Dwarf Virus: New growth of wheat plants infected in the seedling stage is chlorotic or yellowish in color. The entire plant will be severely dwarfed, tiller sparsely and produce few heads with little or no seed. Plants that become infected after the tillering stage are not dwarfed. The yellow dwarf virus can be carried from plant to plant by several species of grain aphids that overwinter on perennial grasses. No effective control measures are known other than utilizing tolerant varieties.
