PNABD246.pdf

virus by the host range, symptoms, transmissibility by aphids, stability in
crude juice, morphology, inclusions and serological relationship. The virus was
transmitted easily by juice inoculation and also by aphids, but not through
seed of soybean and mungbean. Eighteen plant species of 5 families out of 34
plant species of 11 families were infected by juice inoculation. The virus
withstood heating at 55 C for 10 min but not 60 C, dilution of 1.UE-3 but not
of 1.0E-", ageing of 7 days but not 14 days at room temperature (22-30 C). The
virus particles were elongated flexuous rods, 760 nm in length. Inclusions
induced by infection of the virus were similar to those produced by bean yellow
mosaic virus group. The virus showed positive reaction to antiserum against
bean yellow mosaic virus. [AS]
*0298 Benigno, D.R.A. 1979. An aphid-borne virus isolated from blackgrom in
the Philippines. PHILIPPINE AGRICULTURIST, v.62(4):328-332. [En] [En Abst]
(A:PS)
A flexuous rod virus, similar in properties to the bean common mosaic
virus, was isolated from blackgram (Vigna mungo). The virus was mechanically
transmitted by 3 species of aphids (Aphis craccivora Koch., A. gossypii Glover
and Rhopalosiphum maidis Fitch). Tests on the stability of the virus in crude
extract revealed that its thermal inactivation point was between b0 and 70 C,
the dilution end point between I.OE-3 and 1.OE-4, and its longevity in vitro
was 3 days. It systemically infected blackgram, mungbean, and cowpea while
Chenopodium amaranticolor and C. quinoa reacted by chlorotic local lesions,
often followed by systemic vein yellowing. No infections were observed in
Datura stramonium, Gomphrena globosa, Nicotiana glutinosa, N. rustica, N.
tabacum, Vicia faba 'Xanthi' and Zinnia elegans. [AS]
*0299 Farrag, S.H. ; Kandaswamy, T.K. 1979. Soybean and greengram as local
lesion assay hosts for sugarcane mosaic virus. CURRENT SCIENCE, v.48(19):865.
[En] (REP.MB-2186)
Soybean and mungbean were found to be local lesion hosts for sugarcane
mosaic virus. The local lesions could be seen on the second trifoliate leaves
within two days after inoculation in mungbean and five days in soybeans. The
lesions in mungbean were irregular and purple, while in soybean they were
well-defined and necrotic. [EMS]
*0300 Kaiser, W.J. 1979. Natural infection of cowpea and mung bean by
alfalfa mosaic virus in Iran. PLANT DISEASE REPORTER, v.63(5):414-418. [En]
[En Abst] (REP.MB-2086)
Field plantings of cowpea (Vigna unguiculata) and mungbean (Vigna radiata)
in Iran were naturally infected by alfalfa mosaic virus (AMV) during 1966-1971.
Cowpea and mungbean plants typically were stunted and their foliage exhibited
yellow mosaic (calico) symptoms, as did the pods of some infected cowpea
accessions. The incidence of AMV in cowpea and mungbean plantings was usually
less than 10%. Inoculation of cowpea in the field with AMV strains from cowpea
or alfalfa at the full bloom and prebloom stages reduced seed yields about 15%
and 50%, respectively. No mortality of infected plants was observed in these
studies. The virus was transmitted by the pea aphid (Acyrthosiphon pisum) in a
stylet-borne (noncirculative) manner from AMV-infected alfalfa and cowpea to
healthy cowpea. Seeds harvested from naturally or artificially infected cowpeas
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