Some factors determining the level of bean yellow mosaic virus transmission by aphids Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vm40xw17q

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  • Experiments were done to determine the effect of some factors on the level of transmission of bean yellow mosaic virus (BYMV) by aphids. The effect of different source plant treatments, the effect of light on test plant susceptibility, and the effect of a second virus on the transmission of BYMV were tested. Effects from the first two factors would help explain the variation within and among experiments on the transmission of BYMV by aphids. The level of transmission of BYMV by aphids was not affected by the different amounts of nitrogen, phosphorus, or manganese supplied the source plant. There was no effect on the level of transmission when the source plants were subjected to different light-temperature treatments which caused marked differences in plant growth. The presence of a second virus, white clover mosaic virus (WCMV), in the source plant had no effect on the transmission of BYMV by aphids. The effects of different photoperiods, light intensities, light spectrums, and post- and pre-inoculation light treatments on the susceptibility of the test plant to inoculation with BYMV by aphids was tested. Photoperiods of 0, 3, 6, 9, 12, and 15 hours had no effect. There was no difference in the effects of one-fourth, half, three-fourths, and maximum light intensity. Light from lamps with different spectrums had no effect. Post-inoculation light or dark treatments had no effect on the susceptibility of the test plants to inoculation with BYMV by aphids. A pre-inoculation dark treatment of 12-18 hours or a three-minute to six-hour light treatment had an effect on test plant susceptibility to inoculation with BYMV by aphids. Pre-inoculation darkness reduced the susceptibility of the plant. WCMV was not transmitted by the green peach aphid from broad bean sources infected with both WCMV and BYMV. The pea aphid did not transmit WCMV from infected Ladino clover to disease-free Ladino clover. The alfalfa cultivars Talent, Du Puits, Lahontan, Lake Mountain, Ranger, and Grimm; and the white clover cultivars Ladino, Nora White, and New Zealand White were not susceptible to inoculation with BYMV by aphids.
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