Yellows of Sugar Beet Caused by Subterranean Clover Red Leaf Virus.

1980 ◽  
Vol 9 (3) ◽  
pp. 4 ◽  
Author(s):  
GR Johnstone ◽  
D Munro
Keyword(s):  
Sugar Beet ◽  
Subterranean Clover ◽  
Leaf Virus

Some luteovirus diseases in Tasmania caused by beet western yellows and subterranean clover red leaf viruses

1984 ◽  
Vol 35 (6) ◽  
pp. 821 ◽  
Author(s):  
GR Johnstone ◽  
JE Duffus
Keyword(s):  
North America ◽  
Sugar Beet ◽  
Host Range ◽  
Leaf Roll ◽  
Subterranean Clover ◽  
Potato Leaf ◽  
Beet Western Yellows Virus ◽  
Pasture Legumes ◽  
Natural Hosts ◽  
Leaf Virus

A range of crop plants, pasture legumes and weeds, mostly with yellows symptoms similar to those caused by luteoviruses, were collected from the field around Tasmania and checked for infection with beet western yellows virus (BWYV) and subterranean clover red leaf virus (SCRLV) using aphids and indicator plants. BWYV was recovered from 216 of 897 plants tested, representing 30 different species and including 16 not previously recorded as natural hosts. SCRLV was recovered from 163 of 637 plants, representing twelve species including four not previously recorded as natural hosts. BWYV was isolated most often from composites and crucifers, while SCRLV was recovered most frequently from legumes. Eight plants were found infected with both viruses together. In host range studies, Tasmanian isolates of BWYV caused symptoms in lettuce, subterranean clover and sugar beet like those seen on these plants in the field from which the virus was isolated, and were thus similar to isolates of BWYV from North America. The Tasmanian isolates of BWYV were also closely related serologically to Californian isolates of BWYV; these were serologically quite distinct from isolates of SCRLV, and both these groups were serologically distinct from legume yellows virus and from potato leaf roll virus.

THESIS SUMMARY STUDIES OF ALFALFA MOSAIC VIRUS AND SUBTERRANEAN CLOVER RED LEAF VIRUS

1979 ◽  
pp. 163-164
Author(s):  
P.B. Teh
Keyword(s):  
Mosaic Virus ◽  
Alfalfa Mosaic Virus ◽  
Subterranean Clover ◽  
Test Plant ◽  
Transmission Frequency ◽  
Virus Source ◽  
Leaf Virus

AMV was shown to be transmitted by sap, aphids and through lucerne seed, but not by Cuscuta. Virus source and test plant influenced transmission frequency. Sap-inoculation tests showed that 20 species of plants were susceptible to this virus. Thirteen species of plants from the fields where AMV had been detected were tested but only three were found to be infected with the virus.

Purification of a Tasmanian isolate of subterranean clover red leaf virus, and its serological interactions with a New Zealand isolate and other luteoviruses

1982 ◽  
Vol 33 (4) ◽  
pp. 697 ◽  
Author(s):  
GR Johnstone ◽  
JE Duffus ◽  
D Munro ◽  
JW Ashby
Keyword(s):  
New Zealand ◽  
Gradient Centrifugation ◽  
Subterranean Clover ◽  
Particle Morphology ◽  
Serological Tests ◽  
Virus Particles ◽  
Potato Isolate ◽  
Distinct Member ◽  
The Relationship ◽  
Leaf Virus

A Tasmanian isolate of subterranean clover red leaf virus (SCRLV) was purified and concentrated from pea (Pisum sativunz L. cv. Puget) by tissue extraction with cellulase followed by heat clarification, precipitation with polyethylene glycol in salt, and differential and density gradient centrifugation. Virus particles were isometric and 27 nm in diameter. Aulacorthum solani (Kalt.) acquired virus particles from the preparations through Parafilm membranes and transmitted them to healthy subterreanean clover test seedlings, causing disease symptoms of SCRLV. Isolates of SCRLV from Tasmania appeared identical with those from New Zealand on the basis of particle morphology and serological tests. Tasmanian SCRLV was distantly related serologically to Californian isolates of beet western yellows (BWYV) and legume yellows (LYV) viruses. Tests indicated that the relationship was closest with a potato isolate of BWYV and most distant with LYV. Virus particles in sap extracts from infected pea plants were readily detected by electron microscopy following adsorption onto grids coated with SCRLV antiserum, but not on grids coated with antisera to BWYV and LYV. These data confirm that SCRLV is a new, distinct member of the luteovirus group.

Diseases of broad bean (Vicia faba L. major) and green pea (Pisum sativum L.) in Tasmania caused by subterranean clover red leaf virus

1978 ◽  
Vol 29 (5) ◽  
pp. 1003 ◽  
Author(s):  
GR Johnstone
Keyword(s):  
Broad Bean ◽  
Leaf Roll ◽  
Subterranean Clover ◽  
Aphid Transmission ◽  
Pisum Sativum L ◽  
Bean Plants ◽  
Subterranean Clover Stunt Virus ◽  
Efficient Vector ◽  
Green Pea ◽  
Leaf Virus

A leaf-roll disease of broad bean, similar to that induced by bean leaf roll virus (BLRV) in Europe, is common in Tasmania. Subterranean clover red leaf virus (SCRLV) was transmitted to subterranean clover test seedlings by using its most efficient vector, Aulacorthum solani (Kalt.), from 84% of 204 randomly selected affected broad bean plants. The disease was reproduced in broad bean with SCRLV in controlled aphid transmission tests. Effects of infection on yield were severe, as further pod set was markedly reduced after symptoms of infection developed. There was some variation among cultivars in their response to infection. The virus occurred as commonly in green pea crops as in broad bean. In pea it caused a top yellowing, but most commercially grown pea cultivars had some tolerance. Subterranean clover stunt virus (SCSV) caused symptoms in broad bean and pea which were also similar to those induced by SCRLV. However, SCSV was rarely found infecting plants in Tasmanian pea and bean crops. BLRV, SCRLV and SCSV share many properties in common and with some other viruses.

Aulacorthum (neomyzus) circumflexum, a vector of Subterranean clover red leaf virus.

1983 ◽  
Vol 12 (4) ◽  
pp. 66 ◽  
Author(s):  
K Helms ◽  
PM Waterhouse ◽  
M Carver
Keyword(s):  
Subterranean Clover ◽  
Leaf Virus
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