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- Epidemiology of Mungbean Yellow Mosaic Virus in the Philippines
Epidemiology of Mungbean Yellow Mosaic Virus in the Philippines
Dissertation Abstract:
Transmission tests showed that mungbean yellow mosaic virus (MYMV) was readily sap-transmitted to mungbean and other legumes. Return inoculation tests also indicated that MYMV could be transmitted from mungbean to cowpea and back to mungbean without any symptom differences from transmission from mungbean to mungbean. Inoculated plants showed local lesions first and systemic lesions later. MYMV was also found to be seed-transmitted. Seed obtained from apparently healthy and infected mungbean gave 4.97 and 93.93% infection, respectively.
Vector studies revealed that Aphis craccivora Koch transmitted MYMV more efficiently than Myzus persicae Sulz. from mungbean but not to other plant species from which positive mechanical transmission was obtained. Systematic symptoms appeared in infected plants 11 days after inoculation. However, MYMV was nonpersistent in both species.
The virus had a limited host range, infecting only such legumes as Phaseolus aureus Rox. (mungbean), Vigna sinensis Linn. (red cowpea), V. sesquipedeles xv. Sinensis (bush sitao), V. sesquipedeles (string beans), V. sinensis Linn. (white cowpea), P/ lunatus Linn. (patani), Centrosema pubescens, Puereria phaseoloides(Roxb.) Benth (kudzu), and Datura stramonium .These species exhibited both local lesions and systemic symptoms, excepo C. pubescens and kudzu which manifested only systemic symptoms, and red cowpea, white cowpea, and D. stramonium which showed local lesions only.
The epidemiology of MYMV was observed to be affected by weather conditions. During the wet season, the spread of MYMV was limited by rainfall and wind speed, whereas during the dry season, the limiting factors were high temperature, high solar radiation, longer photoperiod and wind speed. While aphid infections were noted at the onset of flowering, greater aphid population and MYMV infection, however, were more evident during the dry than the wet season.