Impact of wheat and corn as rotational crops on corky ringspot disease of Russet Norkotah potato
2002
Mojtahedi, H. | Crosslin, J.M. | Thomas, P.E. | Santo, G.S. | Brown, C.R. | Wilson, J.H.
Tobacco rattle virus (TRV), the causal agent of corky ringspot disease of potato (CRS), was detected by reverse transcription-polymerase chain reaction (RTPCR) in root tissues of field- and greenhouse-grown wheat (two) and corn (10) cultivars. TRV was also detected in some of the same samples by enzyme-linked immunosorbent assay (ELISA), but in a low frequency. Compared to `Samsun NN' tobacco, wheat and corn appeared to be poorer hosts of TRV. However, these crops served as inoculum reservoirs of TRV. A nonviruliferous population of the nematode Paratrichodorus allies, the vector of TRV, acquired the virus from infected wheat and corn roots, and transmitted it to potato. `Russet Norkotah' potatoes grown following TRV-infected corn and wheat, were blemished with arcs, concentric rings and diffuse browning, characteristic symptoms of CRS. The observations presented here suggest that wheat and corn as rotational crops will sustain TRV in a CRS problem field and the virus may cause severe damage on subsequent potato crops.
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