Common Chickweed Control in Established Alfalfa

Kapuśta, George

doi:10.1017/s0043174500031878

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…Twelve of 23 herbicide treatments significantly increased first harvest alfalfa protein percentage in 1972. This is in con trast to the 1971 results and studies conducted by Kapusta (7) in 1969 and 1970. All triazine herbicides increased percent protein although not at all rates tested.…”

Section: Downy Brome Yields As Affected By Herbicide Treatmentssupporting

confidence: 85%

Selective Control of Downy Brome in Alfalfa

Kapuśta

Strieker

1975

Weed sci.

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Selective control of downy brome (Bromus tectorumL.) in alfalfa (Medicago sativaL.) was studied in 1971 and 1972. Herbicidal efficacy and alfalfa tolerance, yield, and percent and total protein were observed. The weed population was composed of almost 100% downy brome in 1971 and 1972. Herbicide treatments were applied early and late winter when both alfalfa and downy brome were dormant. Five herbicides afforded virtually complete downy brome control in 1971: pronamide [3,5-dichloro-N-(1,1-dimethyl-2-propynyl) benzamide] at 0.84 and 1.40 kg/ha, simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] at 1.12 kg/ha, terbacil (3-tert-butyl-5-chloro-6-methyluracil) at 0.84 kg/ha, paraquat (1–1′-dimethyl-4,4′-bipyridinium ion) at 0.56 kg/ha and cyanazine {2-[[4-chloro-6-(ethylamino)-s-triazin-2-yl] amino]-2-methylpropionitrile} at 3.4 kg/ha. All herbicide treatments reduced downy brome yields in 1972. Significantly higher alfalfa yields were closely related with lower downy brome yields. In 1972, alfalfa treated with propham (isopropyl carbanilate), cyanazine, pronamide and terbacil also was higher in second cutting yields than the control. Twelve of the 23 treatments, including all triazine herbicides, increased first harvest alfalfa protein percentage in 1972 although differences were not observed in 1971. Alachlor [2-chloro-2′,6′-diethyl-N-(methoxymethyl)-acetanilide] spring-applied in 1971 at 5.62 kg/ha was the only treatment causing visual alfalfa injury.

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Section: Downy Brome Yields As Affected By Herbicide Treatmentssupporting

confidence: 85%

Selective Control of Downy Brome in Alfalfa

Kapuśta

Strieker

1975

Weed sci.

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“…In some studies, weed control has increased alfalfa yields (4,6,9); and in others, yields were similar or less following weed control (10,11). Results from several experiments have shown that herbicides can be used to control weeds selectively in established alfalfa (4,5,6,8,11).…”

Section: Introductionmentioning

confidence: 99%

New Herbicides for Weed Control in Established Alfalfa (Medicago sativa)

Wilson¹

1989

Weed technol.

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Spring-applied herbicides were evaluated in field studies conducted in 1985 through 1987 in western Nebraska for selective weed control in irrigated established alfalfa. Imazethapyr, norflurazon, pendimethalin, and prodiamine did not injure alfalfa but varied in their weed control spectrums. Overall weed densities were lowest in plots treated with norflurazon at 2.8 kg ai/ha and diuron at 1.8 kg/ha.

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“…The failure of the 0.9 kgjha rate of simazine to control common ragweed should be of no practical concern, since it usually is intended for control of perennials, such as hoary alyssum, white cockle, and yellow rocket. Previous work by a number of researchers (4,7,8,9,12) has demonstrated the potential of all of these herbicides for controlling specific weed problems in alfalfa.…”

Section: Discussionmentioning

confidence: 99%

“…While the triazine herbicides have demonstrated a potential for controlling perennial weeds in alfalfa, these chemicals frequently injure the crop (4,7,8,12). This injury is often associated with young stands where taproot development is not complete, with sandy soils where excessive leaching of the herbicides 1 R•:search supported by the College of Agric.…”

mentioning

confidence: 99%

Susceptibility of Alfalfa Cultivars to Triazine Herbicides¹

Harvey¹,

Rohweder²,

Fawcett

1976

Agronomy Journal

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While simazine [2‐chloro‐4,5‐bis(ethylamine)‐s‐triazine] has been used for several years to control perennial broadleaf weeds in alfalfa (Medicago sativa L.), it occasionally fails to provide adequate weed control, or causes crop injury. Other triazine herbicides have been shown to provide more reliable weed control but also may injure the crop. Consequently, this study was conducted to determine which triazine herbicide was least injurious to alfalfa and if alfalfa cultivars differed in their susceptibilities to the herbicides. Included in the study were five alfalfa cultivars and the herbicides atrazine [2‐chloro‐4‐(ethylamino)‐6‐(isopropylamino)‐s‐triazine], cyanazine [2‐chloro‐4‐ (1‐cyano‐1‐methylethylamino)‐6‐ethylamino‐s‐triazine], secbumeton (2‐sec‐butylamino‐4‐ethylamino‐6‐methxy‐s‐triazine) and simazine. The cultivars were established on silt loam (Typic Argin‐doll Fine‐Silty Mixed Mesic) and loamy sand (Typic Udipsament Sandy‐Mixed) soils. Results of tests conducted on both soils indicated that the ‘Vernal,’ ‘Saranac,’ and ‘Iroquois’ cultivars had the greatest yield potential under Wisconsin conditions, but when expressed as a percentage of yield in untreated plots, the ‘Tempo’ cultivar was injured least by the herbicides. The ‘DuPuits’ cultivar, while initially responding to the triazine herbicides much like the other cultivars, exhibited greater injury after overwintering. Initial injury to the Vernal cultivar on the silt loam soil was greatest from atrazine, secbumeton, and cyanazine, but recovery was nearly complete by the spring following treatment. On the loamy sand soil, however, atrazine and high rates of simazine produced the greatest initial injury, and injury to the Vernal cultivar persisted through the following spring.

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Common Chickweed Control in Established Alfalfa

Cited by 4 publications

References 15 publications

Selective Control of Downy Brome in Alfalfa

Selective Control of Downy Brome in Alfalfa

New Herbicides for Weed Control in Established Alfalfa (Medicago sativa)

Susceptibility of Alfalfa Cultivars to Triazine Herbicides¹

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Common Chickweed Control in Established Alfalfa

Cited by 4 publications

References 15 publications

Selective Control of Downy Brome in Alfalfa

Selective Control of Downy Brome in Alfalfa

New Herbicides for Weed Control in Established Alfalfa (Medicago sativa)

Susceptibility of Alfalfa Cultivars to Triazine Herbicides1

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Susceptibility of Alfalfa Cultivars to Triazine Herbicides¹