Herbicides for the selective control of barley grass in irrigated clover pastures

1963 ◽  
Vol 3 (8) ◽  
pp. 35 ◽  
Author(s):  
VR Squires
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Subterranean Clover ◽  
Severe Damage ◽  
Complete Control ◽  
Selective Control ◽  
Hordeum Leporinum ◽  
Trifolium Repens L ◽  
Clover Pasture ◽  
Slight Damage

Three herbicides, 2,2- DPA (2,2-dichloropropzonzc acid), diquat dibromide (9, l0-dihydro-8a, 10a-dizonia phenanthrene dibromide) and paraqmt di (methyl sulphate) (1,l-dimethl-4,4,-bipryridylium di (methyl sulphate) ) were tested with a view to controlling barley grass (Hordeum leporinum Link) in clover pastures. The tolerance of white clover (Trifolium repens L.) and subterranean clover (T. subterraneum L.) to sodium 2,2-DPA was determined. 2,2-DPA caused severe damage to subterranean clover (resulting in the loss of one season's production) and slight damage to white clover at a rate which controlled the grass-2 lb an acre acid equivalents. Diquat dibromide applied at 2 lb an acre (active cation) in mid winter gave complete control of barley grass in a subterranean clover pasture. Springfields of clover on treated plots were double those of the unseated control. Paraquat di (methyl sulphate) gave satisfactory control of barley, grass at 0.5 lb an acre, as an early post emergence spray, with no increase in subterranean clover yields, At the 1 lb an acre rate barley grass control was complete.

Occurrence of alfalfa mosaic, clover yellow vein, subterranean clover red leaf, and white clover mosaic viruses in white clover throughout Australia

1998 ◽  
Vol 49 (4) ◽  
pp. 723 ◽  
Author(s):  
M. R. Norton ◽  
G. R. Johnstone
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Subterranean Clover ◽  
Yellow Vein ◽  
Enzyme Linked Immunosorbent Assay ◽  
Winter Rainfall ◽  
Field Samples ◽  
Trifolium Repens L ◽  
Compound Interest ◽  
Significant Spread

The levels of infection with 4 viruses in young white clover (Trifolium repens L.) plots sown in 1991 or 1992 were monitored at a total of 17 sites across the 6 States of Australia. Tests were undertaken for alfalfa mosaic (AMV), clover yellow vein (ClYVV), subterranean clover red leaf (SCRLV) (syn. soybean dwarf), and white clover mosaic (WClMV) viruses on field samples of 17 different cultivars, plus a local naturalised ecotype at each location, twice yearly over 3 years. The tests were undertaken using double antibody sandwich enzyme-linked immunosorbent assay (DASELISA). AMV and WClMV were the most common and widespread viruses. They infected plants atmany sites soon after establishment and then rapidly increased to high levels, occasionally exceeding 90% of plants. In contrast, at some sites, no infection with these viruses was detected. Analysis of the infection data at 4 sites, where significant spread of AMV occurred, indicated that the epidemics developed like compound interest models. Tests for SCRLV were done only in 1994 when moderate levels of infection were found at most southern, winter-rainfall dominant sites. The occurrence o fClYVV was sporadic and infection levels were always low.

An SSR and AFLP molecular marker-based genetic map of white clover (Trifolium repens L.)

Plant Science ◽  
2003 ◽  
Vol 165 (3) ◽  
pp. 531-539 ◽  
Author(s):  
Elizabeth S. Jones ◽  
Leonie J. Hughes ◽  
Michelle C. Drayton ◽  
Michael T. Abberton ◽  
Terry P.T. Michaelson-Yeates ◽  
...  
Keyword(s):  
Molecular Marker ◽  
Genetic Map ◽  
White Clover ◽  
Trifolium Repens ◽  
Trifolium Repens L

Validation of in silico-predicted genic SNPs in white clover (Trifolium repens L.), an outbreeding allopolyploid species

2007 ◽  
Vol 277 (4) ◽  
pp. 413-425 ◽  
Author(s):  
N. O. I. Cogan ◽  
M. C. Drayton ◽  
R. C. Ponting ◽  
A. C. Vecchies ◽  
N. R. Bannan ◽  
...  
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
In Silico ◽  
Trifolium Repens L

Observations on resistance in white clover (Trifolium repens L.) to the stem nematode (Ditylenchus dipsaci (Kühn) Filipjev)

1988 ◽  
Vol 110 (1) ◽  
pp. 145-154 ◽  
Author(s):  
R. Cook ◽  
D. R. Evans
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Significant Positive Correlation ◽  
Leaf Size ◽  
Nematode Reproduction ◽  
Long Period ◽  
Plant Collections ◽  
Ditylenchus Dipsaci ◽  
Trifolium Repens L ◽  
Selection For

SummaryThe expression of symptoms of stem nematode reproduction on a total of 53 white clovers (26 cultivars, 14 genepools and 13 introductions from plant collections) was studied in a series of field and glasshouse experiments. Seedlings or stolon-tip cuttings were inoculated with nematodes and the clovers classified by the proportion of plants which developed symptoms. Significant differences were found between varieties although in each test the majority was intermediate between more resistant and susceptible extremes. There was significant positive correlation between tests, in spite of different inoculation methods and different average levels of susceptibility. Very large-leaved cv. Aran was more resistant than most other clovers tested, and small-leaved cv. S. 184 was more susceptible. There was no general correlation of leaf size with reaction to stemnematode. Small-leaved cv. Pronitro was also resistant while several large-leaved cultivars were susceptible. In observations of plants exposed to nematodes over a long period, either by sequential inoculations or through perpetuating latent infections, apparently resistant plants eventually succumbed and supported nematode reproduction. It has not been determined whether this was because selection for virulence in the nematodes had occurred.

scholarly journals Transcriptome analysis reveals potential genes involved in flower pigmentation in a red-flowered mutant of white clover (Trifolium repens L.)

Genomics ◽  
2018 ◽  
Vol 110 (3) ◽  
pp. 191-200 ◽  
Author(s):  
Heshan Zhang ◽  
Hong Tian ◽  
Mingxin Chen ◽  
Junbo Xiong ◽  
Hua Cai ◽  
...  
Keyword(s):  
White Clover ◽  
Transcriptome Analysis ◽  
Trifolium Repens ◽  
Trifolium Repens L ◽  
Flower Pigmentation

scholarly journals Impact of Environmental Factors on Seed Germination and Seedling Emergence of White Clover (Trifolium repens L.)

Agronomy ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 190
Author(s):  
Lei Chu ◽  
Yiping Gao ◽  
Lingling Chen ◽  
Patrick E. McCullough ◽  
David Jespersen ◽  
...  
Keyword(s):  
Seed Germination ◽  
Environmental Factors ◽  
White Clover ◽  
Trifolium Repens ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Soil Surface ◽  
High Sensitivity ◽  
Series Of Experiments ◽  
Trifolium Repens L

White clover (Trifolium repens L.) is cultivated as a forage crop and planted in various landscapes for soil conservation. There are numerous reports of failed white clover stands each year. A good understanding of the seed germination biology of white clover in relation to environmental factors is essential to achieve successful stand establishment. A series of experiments were conducted to investigate the impacts of light, temperature, planting depth, drought, and salt stress on seed germination and the emergence of white clover. White clover is negatively photoblastic, and seed germination averaged 63 and 66% under light and complete dark conditions 4 weeks after planting (WAP), respectively. Temperature affected the seed germination speed and rate. At 1 WAP, seeds incubated at 15 to 25 °C demonstrated a significantly higher germination rate than the low temperatures at 5 and 10 °C; however, the germination rate did not differ among the temperature treatments at 4 WAP. The results suggest that white clover germination decreases with increasing sowing depths, and the seeds should be sown on the soil surface or shallowly buried at a depth ≤1 cm to achieve an optimal emergence. White clover seeds exhibited high sensitivity to drought and salinity stress. The osmotic potential and NaCl concentration required to inhibit 50% seed germination were −0.19 MPa and 62.4 mM, respectively. Overall, these findings provide quantifiable explanations for inconsistent establishment observed in field conditions. The results obtained in this research can be used to develop effective planting strategies and support the successful establishment of white clover stands.

scholarly journals Enhanced drought tolerance in white clover

1993 ◽  
pp. 97-100
Author(s):  
J. Van den Bosch ◽  
I.K. Black ◽  
G.R. Cousins ◽  
D.R. Woodfield
Keyword(s):  
New Zealand ◽  
Drought Tolerance ◽  
White Clover ◽  
Trifolium Repens ◽  
Root Morphology ◽  
Forage Yield ◽  
Plant Survival ◽  
Breeding Programmes ◽  
Trifolium Repens L ◽  
Per Se

Drought-stress limits white clover (Trifolium repens L.) persistence in many New Zealand regions. As a component of breeding for enhanced drought tolerance, 8 selection groups (110 lines in total) of white clover were evaluated in the Wairarapa over a 2-year period. The selection groups included Australian white clover ecotypes, selections from New Zealand dryland populations, root morphology selections, pre-release selections from New Zealand breeding programmes, and existing overseas and New Zealand cultivars. The selection groups derived from New Zealand dryland populations had the highest forage yield and plant survival, 21 of the 24 individual lines with >30% plant survival coming from these groups. Groups containing Australian ecotypes and overseas cultivars had the lowest forage yield and plant survival. Selections for root morphology per se were lower yielding and less persistent than selections made from New Zealand dryland populations evaluated in drought-prone environments. However, some improvements in forage yield and persistence were observed through selecting for root morphology after screening the same New Zealand dryland populations in a drought-prone North Canterbury site. Keywords: drought tolerance, plant breeding, root morphology, Trifolium repens

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