MH as a Roadside Grass Retardant

Weed Science ◽  
1971 ◽  
Vol 19 (1) ◽  
pp. 86-90 ◽  
Author(s):  
L. E. Foote ◽  
B. F. Himmelman
Keyword(s):  
Acetic Acid ◽  
Proper Timing ◽  
Weed Infestation ◽  
Annual Weeds ◽  
Dichlorophenoxy Acetic Acid

MH (1,2-dihydro-3,6-pyridazinedione) was applied at 4 to 6 lb/A, in spring and fall, with and without (2,4-dichlorophenoxy)acetic acid (2,4-D), on roadsides normally mowed from 2 to 12 times a year. MH at 6 lb/A applied in spring generally reduced grass height. Lower rates and fall applications were generally ineffective. Depending on area, rural or urban, and retardant effectiveness, between zero and five mowings per year were saved. When the MH was effective and the turf was not strong and vigorous, annual weeds such as crabgrass (Digitaria spp. Heist.), foxtail (Setaria spp. Beauv.), and ragweed (Ambrosia spp. L.) often increased and gave the roadside an undesirable appearance. When MH was used without 2,4-D, the roadside generally had a poorer appearance than when not treated. When MH was applied with 2,4-D and no application ‘'skips” or annual weed infestation occurred, the roadside sometimes had a satisfactory appearance. The time when MH can be effectively applied is short (about 2 weeks). Rains, winds, and springtime roadway work make proper timing of applications difficult under Minnesota conditions. Applications of 2,4-D alone or with MH were effective in reducing roadside weeds.

EFFECTS OF THE CONTINUOUS USE OF 2,4-D AND MCPA ON SPRING WHEAT PRODUCTION AND WEED POPULATIONS

1974 ◽  
Vol 54 (2) ◽  
pp. 241-245 ◽  
Author(s):  
E. V. McCURDY ◽  
E. S. MOLBERG
Keyword(s):  
Acetic Acid ◽  
Spring Wheat ◽  
Triticum Aestivum L ◽  
High Rate ◽  
Residual Effects ◽  
Grain Yields ◽  
Weed Growth ◽  
Annual Weeds ◽  
Dichlorophenoxy Acetic Acid ◽  
Summer Fallow

An experiment was conducted to determine whether annual applications of herbicides have any harmful residual effects on the growth of spring wheat (Triticum aestivum L.). Amine and ester formulations of (2,4-dichlorophenoxy) acetic acid (2,4-D) were applied to plots on Indian Head clay soil each year from 1947 to 1972. On other plots in the same experiment, the sodium salt of 2,4-D was applied each year from 1947 to 1952, followed by amine or ester formulations of [(4-chloro-o-tolyl)oxy]acetic acid (MCPA) from 1953 to 1972. Two rates of application were used, a low rate suitable for controlling susceptible annual weeds and a high rate suitable for controlling perennial weeds. Check plots receiving no herbicide were arranged to be adjacent to each treated plot. A 3-yr rotation of wheat, wheat, summer fallow was followed. The effects of the herbicides on grain yields and weed growth were observed. Some reductions in grain yields were caused by the high rates of ester formulations but there was no evidence of any buildup of herbicides or harmful residual effects from the treatments. The herbicides did not eradicate any of the weeds but drastically reduced the numbers emerging in the crops and on the summer fallow.

Phenoxy Acid Herbicides for Barnyardgrass Control in Transplanted Rice

Weed Science ◽  
1971 ◽  
Vol 19 (3) ◽  
pp. 203-206 ◽  
Author(s):  
S. K. De Datta ◽  
R. Q. Lacsina ◽  
D. E. Seaman
Keyword(s):  
Acetic Acid ◽  
Rice Seedlings ◽  
Japonica Variety ◽  
Transplanted Rice ◽  
Phenoxy Acid Herbicides ◽  
Delayed Flowering ◽  
Annual Weeds ◽  
Dichlorophenoxy Acetic Acid ◽  
Acid Herbicides ◽  
Derivatives Of

In experiments conducted at the International Rice Research Institute, Philippines, all commonly marketed formulations and derivatives of either [(4-chloro-o-tolyl)oxy]acetic acid (MCPA) or (2,4-dichlorophenoxy) acetic acid (2,4,D) performed in about the same way and were equally safe for use in controlling barnyardgrass [Echinochloa crusgalli (L.) Beauv.] and other annual weeds in transplanted rice (Oryza sativa L.). Eleven-day-old rice seedlings were more susceptible to amine salts of 2,4-D or MCPA than 21-day-old seedlings. Granular formulations of some chemicals were relatively less toxic than liquid formulations. The toxic effect of spraying the potassium salt of MCPA was less prolonged on the indica variety, IR22, than it was on the japonica variety, Chianung 242, which had delayed flowering and maturity.

Plant Regeneration from Excised Cotyledons of Mature Strawberry Achenes

HortScience ◽  
1990 ◽  
Vol 25 (5) ◽  
pp. 569-571 ◽  
Author(s):  
A. Raymond Miller ◽  
Craig K. Chandler
Keyword(s):  
Acetic Acid ◽  
Plant Regeneration ◽  
Multiple Shoot ◽  
Naphthaleneacetic Acid ◽  
Developmental Studies ◽  
Shoot Buds ◽  
Cotyledon Explants ◽  
Multiple Shoot Buds ◽  
Rapid Regeneration ◽  
Dichlorophenoxy Acetic Acid

A protocol was developed for excising and culturing cotyledon explants from mature achenes of strawberry (Fragaria × ananassa Duch.). Cotyledon explants formed callus with multiple shoot buds on agar-solidified Murashige and Skoog media containing several combinations of hormones (1 μm 2,4-D; 10 μm 2,4-D; 1 μm BA + 1 μm 2,4-D; 1 μm BA + 10 μm 2,4-D; 5 μm BA; 5 μm BA + 1 μm 2,4-D; 5 μm BA + 10 μ m 2,4-D; 5 μ m BA + 5 μm NAA; 5 μ m BA + 15 μ m NAA). After three subcultures, only tissues maintained on the medium containing 5 μm BA + 5 μm NAA continued to form shoots. Tissues transferred to other media eventually died (1 μm 2,4-D; 1 μ m BA + 10 μ m 2,4-D; 5 μ m BA; 5 μ m BA + 1 μ m 2,4-D), became unorganized (1 μm BA + 1 μm 2,4-D; 5 μm BA + 10 μm 2,4-D; 5 μm BA + 15 μm NAA), or formed roots (10 μm 2,4-D). Whole plantlets were produced by transferring callus with buds to medium lacking hormones. The rapid regeneration of clonal plantlets from cotyledon explants may be useful for reducing variability in future developmental studies. Chemical names used: N-(phenylmethyl)-1H-purin-6-amine (BA); (2,4-dichlorophenoxy) acetic acid (2,4-D); and 1-naphthaleneacetic acid (NAA).

Cotton Resistance to 2,4‐Dichlorophenoxy Acetic Acid Spray Drift 1

Crop Science ◽  
1986 ◽  
Vol 26 (2) ◽  
pp. 376-377 ◽  
Author(s):  
Cecil Regier ◽  
R. E. Dilbeck ◽  
D. J. Undersander ◽  
J. E. Quisenberry
Keyword(s):  
Acetic Acid ◽  
Spray Drift ◽  
Dichlorophenoxy Acetic Acid

Enhancement of Herbicide Activity with an Isoparaffinic Oil Carrier

Weed Science ◽  
1971 ◽  
Vol 19 (6) ◽  
pp. 701-705 ◽  
Author(s):  
R. J. Burr ◽  
G. F. Warren
Keyword(s):  
Acetic Acid ◽  
Cyperus Rotundus ◽  
Setaria Viridis ◽  
Ipomoea Hederacea ◽  
Purple Nutsedge ◽  
Green Foxtail ◽  
Herbicide Activity ◽  
Dichlorophenoxy Acetic Acid ◽  
Agropyron Repens

Several herbicides were tested in the greenhouse on ivyleaf morningglory (Ipomoea hederacea(L.) Jacq.), green foxtail (Setaria viridis(L.) Beauv.), purple nutsedge (Cyperus rotundusL.), and quackgrass (Agropyron repens(L.) Beauv.) to determine the degree of enhancement in activity that could be obtained with an isoparaffinic oil carrier applied at 140 L/ha. The enhancement varied with the herbicide and with the species, ranging from 16-fold enhancement with 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine) and 2-sec-butyl-4,6-dinitrophenol (dinoseb) on ivyleaf morningglory to no enhancement of atrazine activity on purple nutsedge and quackgrass or (2,4-dichlorophenoxy)acetic acid (2,4-D) activity on quackgrass and ivyleaf morningglory. An oil adjuvant was less effective in enhancing dinoseb and 3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea (linuron) activity than was the isoparaffinic oil carrier. Also, the isoparaffinic oil carrier emulsified in water was less effective than the undiluted oil in enhancing dinoseb activity on green foxtail, even though equal volumes of the isoparaffinic oil were applied.

scholarly journals Influence of growth regulators and explants on shoot regeneration in carnation

2009 ◽  
Vol 36 (No. 4) ◽  
pp. 140-146 ◽  
Author(s):  
J.K. Kanwar ◽  
S. Kumar
Keyword(s):  
Acetic Acid ◽  
Shoot Regeneration ◽  
Growth Regulators ◽  
Dianthus Caryophyllus ◽  
Naphthalene Acetic Acid ◽  
Ms Medium ◽  
Shoot Bud ◽  
Dichlorophenoxy Acetic Acid ◽  
Number Of Shoots

The influence of growth regulators, explants and their interactions on in vitro shoot bud formation from callus was studied in <I>Dianthus caryophyllus</I> L. The leaf and internode explants were cultured on Murashige and Skoog (MS) medium containing different concentrations of growth regulators. The highest callus induction was observed with 2 mg/l 2,4-dichlorophenoxy acetic acid (2,4-D) and 1 mg/l benzyl adenine (BA). Out of twenty seven shoot regeneration media tested, only 2 mg/l thidiazuron (TDZ) and zeatin alone or in combination with naphthalene acetic acid (NAA) and/or indole acetic acid (IAA) could differentiate calli. The highest average number of shoots was observed with 2 mg/l TDZ and 1 mg/l IAA. Significant differences were observed in calli producing shoots and number of shoots per callus in the explants of leaf and internode. The shoots were elongated and multiplied on MS medium supplemented with 1 mg/l BA and solidified with 1% agar. The shoots were rooted and hardened with 76% survival success in pots after six weeks of transfer to the pots.

Sign in / Sign up

Export Citation Format

Share Document