Mosaics Caused by Aphid-Transmitted Viruses
Figure 1 - Faint chlorosis and vein banding of drybean—BCMV
Figure 2 - Mosaic and leaf distortion of snap bean—BYMV
Figure 3 - Bright yellow mosaic of soybean—AMV
Figure 4 - Leaf distortion and blistering of snap bean—typical of PSV and CMV
Potyviruses: Bean common mosaic (BCMV), Bean yellow mosaic (BYMV), Clover yellow vein (CYMV), Peanut mottle(PeMoV), and Soybean mosaic (SMV) virus
Cucumoviruses: Cucumber mosaic (CMV) and Peanut stunt (PSV) virus
Ilarvirus: Alfalfa mosaic virus (AMV)
Mosaic Viruses Are:
- Transmitted in a non-persistent manner by aphids after brief acquisition and feeding probes; retained on stylet tips only.
- Transmitted by sap or by contacting infected plant parts.
- Some can be transmitted through seed by infecting the seed embryo.
- Presence of aphid vectors, either colonizing or migratory
- Infected perennial legumes nearby, e.g. alfalfa, clover, vetch
- Seed carrying seed-borne virus particles (e.g., AMV, BCMV, CMV, PeMoV, SMV)
- infection at V1-V4 enhances symptom severity, reduced pod set and distortion, stunting, and yield loss
Courtesy of S. A. Tolin and H. F. Schwartz, Colorado State University [09/09]