PNABD246.pdf

*0276 Capoor, S.P. ; Varma, P.M. 1948. Yellow mosaic of Phaseolus lunatus
L. CURRENT SCIENCE, v.17:152-153. [Enj (REP.MB-2399)
A new virus mosaic disease was reported on Phaseolus lunatus. The virus is
only transmissible through grafting or the whitefly Bemisia tabaci. Its host
range is restricted to a few leguminous species, including mungbean. [EMS]
*0277 Dale, W.T. 1949. Observations on a virus disease of cowpea in
Trinidad. ANNALS OF APPLIED BIOLOGY, v.36(3):327-333. [Enj [En Abstj
(REP .MB-2388)
A mosaic of cowpea and asparagus-bean (Vigna unguiculata) is common in
Trinidad. The same virus sometimes attacks Cajanus indicus, Crotalaria juncea,
Glycine max, Vigna mungo and V. radiata, usually when growing near to infected
cowpeas. Desmodium frutescens, Psophocarpus tetragonolobus, Sesbania speciosa,
Vigna vexillata, Phaseolus trinervius and varieties of P. lunatus are also
susceptible to systemic infection. Most of the above give local lesions, which
are the only symptoms produced on Canavalia ensiformis and Dolichos lablab. No
infections were obtained on Phaseolus vulgaris, or on any plant outside the
Leguminosae. The virus is seed-borne in asparagus-bean, but apparently not in
tested cowpea varieties. The leaf beetle Ceratomia ruficornis is a vector, and
is probably largely responsible for spread in the field; Aphis medicaginis
seems unable to transmit the disease. The thermal inactivation point of the
virus is 66 C., its dilution endpoint 1:100,000 and longevity in vitro over 20
days. [ASJ
*0278 Raychaudhuri, S.P. ; Pathanian, P.S. 1950. A mosaic disease of
Crotalaria mucronata Desv. (C. striata D.C.). CURRENT SCIENCE, v.19:213.
[En] (REP.MB-2461)
A mosaic disease of Crotalaria mucronata is described. The virus is readily
transmitted by sap-inoculation to C. juncea, Vigna sinensis, Vigna mungo and
Vigna radiata. The symptoms appear 7-12 days after inoculation. LTHH]
*0279 Fry, P.R. 1959. A clover mosaic virus in New Zealand pastures. NEW
ZEALAND JOURNAL OF AGRICULTURAL RESEARCH, v.2:971-981. [EnJ [En Abstj
(REP.MB-2380)
Clover mosaic virus is widespread in New Zealand infecting over 50% of
plants in many pastures more than four years old. The virus has been found
occurring naturally on white, red, subterranean, and strawberry clovers, broad
bean, and sweet pea. It has been transferred experimentally to pea, bean, blue
lupin, mungbean, and cowpea but not to Lotus uliginosus, lucerne, cucumber,
spinach, tobacco, or Nicotiana glutinosa. The virus is readily transmitted
experimentally by mechanical inoculation. Natural transmission occurs in the
field in the absence of mechanical damage, suggesting the presence of an insect
vector but the species involved has not yet been determined. Seed transmission
did not occur. From host range, symptoms, and physical properties (thermal
inactivation 60 - 62 C, tolerance to dilution I.OE-6 but not 1.0E-7), the virus
appears to be closely related to pea-wilt virus of Johnson (1942). No immunity
has been found in 194 white clover mother plants. An antiserum has been
prepared by injection of purified virus into a rabbit. The specific serological
precipitate is the flocculent or H type suggesting the virus has a rod shaped
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