Transmission of Two Kinds of Rice Tungro-Associated Viruses by Insect Vectors

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Abstract
Two kinds of tungro-associated viruses, bacilliform (B) and isometric (I), were transmitted together or separately by Nephotettix virescens from rice plants infected with both B and I particles. Both particles were acquired in a 30 min acquisition access period, transmitted in a 10-min inoculation access period, and retained by the insects for 3 days. I particles were transmitted from plants infected with I particles alone, but B particles were not transmitted from plants infected with B particles alone. N. nigropictus transmited I particles from rice plants infected with I particles alone and, occasionally, I particles but not B particles from doubly infected plants.

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