Rice Root Aphid,Rhopalosiphum rufiabdominalis,a Vector of Barley Yellow Dwarf Virus in Illinois, and the Disease Complex

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Abstract
The rice root aphid, R. rufiabdominalis, overwintered as viviparae on underground parts of Vermillion wheat (Triticum aestivum) and Hudson barley (Hordeum vulgare) at Urbana, Illinois, under relatively stable temperatures and transmitted the barley yellow dwarf virus. Hudson barley, Michigan Amber wheat and Dubois oats (Avena sativa) were good virus sources and indicator test plants. In parallel tests, R. rufiabdominalis and R. padi were equally able to transmit 2 vector nonspecific isolates. Both aphids failed to transmit the Macrosiphum avenae specific virus isolate. Like the other 2 isolates, this 1 was readily transmissible by Sitobion avenae. This brings the total number of aphid species known to be vectors of barley yellow dwarf virus to 18.