Effect of herbicides on St John's wort (Hypericum perforatum L.)

1991 ◽  
Vol 31 (4) ◽  
pp. 499 ◽  
Author(s):  
MH Campbell ◽  
BR Milne ◽  
JJ Dellow ◽  
HI Nicol
Keyword(s):  
Hypericum Perforatum ◽  
New South ◽  
Arable Land ◽  
Ground Cover ◽  
Aerial Application ◽  
St John’S Wort ◽  
Strong Trend ◽  
St John's Wort ◽  
South Wales ◽  
Hypericum Perforatum L

The effect of type of herbicide and time and rate of application on the reduction in ground cover of St John's wort (Hypericum perforatum L.) was determined at Orange, New South Wales. In January, April, July and November 1988, 8 herbicide treatments including the currently used glyphosate and picloram + 2,4-D were applied to vigorously growing H. perforaturn, and the reduction in percentage ground cover was recorded in December 1989. Ineffective herbicides (a.i./ha) were tebuthiuron, 0.8-6.4 kg; metsulfuron, 5-20 g; and paraquat + diquat, 0.4 + 0.5 kg. The addition of metsulfuron (2.5 g a.i./ha) to glyphosate (0.9 and 1.8 kg a.i./ha) did not increase the effectiveness of the latter. Effective herbicides (kg a.i./ha) were triclopyr + picloram, 0.6 + 0.2; picloram + 2,4-D, 0.2 + 0.8; glyphosate, 1.8; and triclopyr, 1.92. There was a strong trend for these herbicides to be more effective in January and November than in April and July. Based on price, effectiveness and selectivity, triclopyr + picloram would be preferred to the other herbicides for boom and spot spraying, and glyphosate would be the only herbicide suitable for aerial application prior to sowing improved pastures on non-arable land.

Effect of time of application of herbicides on the long-term control of St. John's wort (Hypericum perforatum var. augustifolium)

1979 ◽  
Vol 19 (101) ◽  
pp. 746 ◽  
Author(s):  
MH Campbell ◽  
JJ Dellow ◽  
AR Gilmour
Keyword(s):  
Hypericum Perforatum ◽  
New South ◽  
Ground Cover ◽  
Experimental Period ◽  
Time Of Application ◽  
St John’S Wort ◽  
St John's Wort ◽  
South Wales ◽  
Long Term Effect

The effect of time of application of herbicides on the long-term control of St. John's wort was investigated at Tuena, New South Wales. The herbicides used were: 2,4-D, 2,4,5-T, 2,4-D -i- 2,4,5-T, picloram + 2,4-D, and glyphosate. Each of these was applied in February, May, August and November, 1976, and regrowth of wort monitored until February 1978. The percentage ground cover of unsprayed St. John's wort varied between 75% and 85% over the experimental period. Initially all herbicides reduced the ground cover of St. John's wort from over 75% to less than 15%. Thereafter the regrowth of wort depended on the long-term effect of the herbicides. At the final assessment in February 1978, the most effective herbicide treatments were: from the February and May applications, glyphosate and picloram + 2,4-D; from the August application, picloram + 2,4-D; and from the November application, picloram + 2,4-D, 2,4-D + 2,4,5-T and 2,4-D.

Control of St. John's wort (Hypericum perforatum var. angustifolium) on non-arable land

1975 ◽  
Vol 15 (77) ◽  
pp. 812 ◽  
Author(s):  
MH Campbell ◽  
KF Flemons ◽  
JJ Dellow
Keyword(s):  
Hypericum Perforatum ◽  
Arable Land ◽  
Subterranean Clover ◽  
Ground Cover ◽  
Good Control ◽  
Late Summer ◽  
Trifolium Subterraneum ◽  
Late Autumn ◽  
St John’S Wort ◽  
St John's Wort

Methods for controlling St. John's wort (Hypericum perforatum var. angustifolium) on non-arable land were investigated in two experiments near Tuena, New South Wales. The effects of herbicides, seed, fertilizer and the timing of the application of these inputs on the establishment of surface-sown legumes and grasses, and on the control of St. John's wort were ascertained. The herbicides, amitrole, 2,4-D, 2,4-D + 2,4,5-T, and picloram were applied with and without 2,2-DPA (sodium 2,2-dichloropropionate) ; glyphosate (N-phosphonomethyl glycine) was applied alone. Establishment, survival and ground cover of sown species and the control of St. John's wort were recorded for up to two years after treatment. Herbicide application was essential for the establishment of cocksfoot (Dactylis glomerata) and phalaris (Phalaris tuberosa), but not for subterranean clover (Trifolium subterraneum), on land infested with St. John's wort. Establishment of grasses and legumes was achieved in one experiment by spraying in late summer and sowing in late autumn, and in another experiment by spraying in late autumn and sowing in early winter. Glyphosate was the most effective herbicide in controlling St. John's wort and associated weeds and in promoting the establishment and development of grasses and legumes. However, good establisment of improved species and good control of St. John's wort was also attained on the 2,4-D and 2,4-D f 2,4,5-T treatments. Thus, until glyphosate becomes commercially available, the most economical method for control of St. John's wort on non-arable land will be the aerial application of 2,4-D + 2,2-DPA three weeks after a distinct autumn break followed by seed and fertilizer three weeks later.

Determination of Hypericin in St. John's Wort (Hypericum perforatum L.) extracts using HPLC-ED

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
E Sofic ◽  
A Copra Janicijevic ◽  
M Maksimovic ◽  
I Tahirovic ◽  
L Klepo ◽  
...  
Keyword(s):  
Hypericum Perforatum ◽  
St John’S Wort ◽  
St John's Wort ◽  
Hypericum Perforatum L

EXTRACTION OF HYPERFORIN AND HYPERICIN FROM ST. JOHN'S WORT (HYPERICUM PERFORATUM L.) WITH DIFFERENT SOLVENTS

2011 ◽  
Vol 35 (2) ◽  
pp. 222-235 ◽  
Author(s):  
DÁNIEL COSSUTA ◽  
TÜNDE VATAI ◽  
MÁRIA BÁTHORI ◽  
JUDIT HOHMANN ◽  
TIBOR KEVE ◽  
...  
Keyword(s):  
Hypericum Perforatum ◽  
St John’S Wort ◽  
St John's Wort ◽  
Hypericum Perforatum L

scholarly journals Extraction of resinoids from St. John's wort (Hypericum perforatum L): I. Efficiency and optimization of extraction

2002 ◽  
Vol 56 (2) ◽  
pp. 54-59 ◽  
Author(s):  
Dragan Milenovic ◽  
Vlada Veljkovic ◽  
Branimir Todorovic ◽  
Miomir Stankovic
Keyword(s):  
Plant Material ◽  
Hypericum Perforatum ◽  
Ethanol Solution ◽  
Operating Conditions ◽  
Solvent Ratio ◽  
Total Extract ◽  
St John’S Wort ◽  
St John's Wort ◽  
Hypericum Perforatum L ◽  
Full Factorial

The extraction of resinoids from St. John's wort (Hypericum perforatum L) was studied in a series of two papers. In the first part, the effects of the operating conditions on the yield of resinoids (total extract) were analyzed, while the mathematical models of extraction kinetics were compared in the second one. The extraction was carried out using an aqueous solution of ethanol (70 and 95 % v/v) at a hydromodulus (plant material to solvent ratio, w/v) of 1:5 or 1:10. The plant material was disintegrated and divided into three fractions (mean particle size: 0.23, 0.57 and 1.05 mm). The temperature was 25, 50 or about 80?C (boiling temperature). A higher yield of resinoids was obtained when the plant material of greater disintegration degree (0.23 mm) was treated with 70% v/v aqueous ethanol solution at higher hydromoduli (1:10) and temperatures (80?C). The effects of the operating factors on the yield of resinoids were estimated by using both the full factorial experimental plan 24 and artificial neuronic networks (ANN) of 3-4-1 topology. Of the two methods, the ANN one was found to be advantageous because of its capability of estimating the yield of resinoids in the whole range of the applied operating conditions.

Heavy Metal Contents of St. John’s wort (Hypericum perforatum L.) Growing in Northern Turkey

2006 ◽  
Vol 1 (3) ◽  
pp. 182-186 ◽  
Author(s):  
Ali Kemal Ayan ◽  
Ridvan Kizilkaya . ◽  
Cuneyt Cirak . ◽  
Kudret Kevseroglu .
Keyword(s):  
Heavy Metal ◽  
Hypericum Perforatum ◽  
St John’S Wort ◽  
St John's Wort ◽  
Metal Contents ◽  
Hypericum Perforatum L
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