The pulse viruses commonly found in Australia are: Alfalfa mosaic virus (AMV), Bean yellow mosaic virus (BYMV), Cucumber mosaic virus (CMV), Pea seed-borne mosaic virus (PSbMV), Bean leafroll virus (BLRV), Beet western yellows virus (BWYV), Soybean dwarf virus (SbDV) and Subterranean clover stunt virus (SCSV). These viruses are listed in Table 10.1 & 10.2
AMV, BYMV, CMV and PSbMV are seed-borne, mechanically transmissible or transmitted by aphids in a non-persistent way (aphid feed on a plant for a few minutes to hours, then the virus is lost from the mouth parts). BLRV, BWYV, SbDV and SCSV are phloem– limited and only transmitted by aphids in a persistent way (the virus stays in the vector for life). These viruses are listed in Tables 10.1 & 10.2
A number of factors interact to determine whether or not a particular year is conducive to virus spread. The main factors which influence virus spread are those that affect the aphid population (such as the weather) and the availability of sources of virus for the aphids to spread (seed, pasture hosts, etc.).
Table 10.1 Seed-borne pulse viruses and their pulse hosts
|Lupins- L. angustifolius||X||*||X|
*plants may be infected but virus not seed-borne
Table 10.2 Common persistent viruses of temperate pulses.
|Lupins- L. angustifolius||X|
A number of factors may affect the development of symptoms in the field including the cultivar, time of infection (seed-borne or during growing season) and other stresses. In some situations, there may be no apparent symptoms on infected plants whereas in other situations stress symptoms in healthy plants may be mistaken for virus symptoms.
VIRUSES IN CROPS