scholarly journals Symptomatology of subterranean clover red leaf virus and its incidence in some crops, weed hosts, and certain alate in Canterbury, New Zealand

1979 ◽  
Vol 22 (2) ◽  
pp. 361-365 ◽  
Author(s):  
J. W. Ashby ◽  
P. B. Teh ◽  
R. C. Close
Keyword(s):  
New Zealand ◽  
Subterranean Clover ◽  
Weed Hosts ◽  
Leaf 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.

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.

Naturalised subterranean clover in New Zealand

1983 ◽  
Vol 26 (1) ◽  
pp. 35-43 ◽  
Author(s):  
F.E.T. Suckling ◽  
M.B. Forde ◽  
W.M. Williams
Keyword(s):  
New Zealand ◽  
Subterranean Clover

Varietal reaction and genetic resistance of subterranean clover (Trifolium subterraneum L.) to subterranean clover stunt virus infection

1960 ◽  
Vol 11 (5) ◽  
pp. 723 ◽  
Author(s):  
NW Grylls ◽  
JW Peak
Keyword(s):  
New Zealand ◽  
Virus Infection ◽  
Iberian Peninsula ◽  
Genetic Resistance ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Third Generation ◽  
Subterranean Clover Stunt Virus ◽  
Mediterranean Regions ◽  
The Mediterranean

Resistance to subterranean clover stunt virus was explored in 390 strains and named varieties of subterranean clover from the Mediterranean regions, England, France, the Iberian peninsula, New Zealand, and Australia. High levels of genetic resistance were shown in the Australian varieties Tallarook, Hill's Small, and Bass B. Resistance of a selected group of F2's was found to be midway between that of the parents. In selected groups of F4 generation hybrids, and in selected second and third generation backcrosses, resistance equal to that of Tallarook was shown. The apparent recovery of some plants during tests in the glass-house was shown to be a form of temporary tolerance to the virus.

scholarly journals Survey for viruses and viroids in apple and pear trees in New Zealand

2010 ◽  
Vol 63 ◽  
pp. 281-281
Author(s):  
M.B. Horner
Keyword(s):  
New Zealand ◽  
Spot Virus ◽  
Tomato Ringspot Virus ◽  
Apple Stem Grooving Virus ◽  
Apple Stem ◽  
Chlorotic Leaf ◽  
Pear Trees ◽  
Leaf Virus ◽  
Stem Pitting ◽  
Geographical Locations

Surveys to determine the phytosanitary status of apple (Malus) and pear (Pyrus) trees in New Zealand were conducted from 2005 to 2006 A total of 188 symptomatic and nonsymptomatic trees from various geographical locations were tested for the presence of a number of viruses and viroids by RTPCR All Malus samples were tested for Apple chlorotic leaf spot virus (ACLSV) Apple stem grooving virus (ASGV) Apple stem pitting virus (ASPV) Apple mosaic virus (ApMV) Apple scar skin viroid (ASSVd) Apple dimple fruit viroid (ADFVd) Cherry rasp leaf virus (CRLV) and Tomato ringspot virus (ToRSV) ACLSV was detected in 48 ASGV in 36 ASPV in 61 and ApMV in 45 of samples tested ASSVd ADFVd CRLV ToRSV were not detected in any of the 165 sampled Malus plants which provides evidence that they are not present in New Zealand All Pyrus samples were tested for ACLSV ASGV ASPV ApMV Pear latent virus (PeLV) and Pear blister canker viroid (PBCVd) ACLSV was detected in 17 ASGV in 13 ASPV in 17 and ApMV in 4 of sampled Pyrus trees PeLV and PBCVd were not detected in any of the 23 sampled symptomatic Pyrus trees which provides evidence that PeLV and PBCVd are not present in New Zealand

scholarly journals Arrowleaf clover: potential for dryland farming systems in New Zealand

2008 ◽  
pp. 239-243 ◽  
Author(s):  
P.M. Evans ◽  
A. Mills
Keyword(s):  
New Zealand ◽  
Soil Fertility ◽  
Dry Matter ◽  
Subterranean Clover ◽  
Farming Systems ◽  
Dry Matter Yield ◽  
Dryland Farming ◽  
Silage Production ◽  
Trifolium Vesiculosum ◽  
Lincoln University

Arrowleaf clover (Trifolium vesiculosum L.) is a late maturing annual legume which has the potential to be used in a range of farming systems such as finishing lambs through to silage production and building soil fertility for future cropping. An experiment at Lincoln University, Canterbury, evaluated the performance of 'Arrotas' arrowleaf clover relative to white and subterranean clover Keywords: climate evaluation, T. repens, T. subterraneum, T. vesiculosum, dry matter yield

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