Kochia (Kochia scoparia) Interference in Sunflower (Helianthus annuus)

Durgan, Beverly R.; Dexter, A. G.; Miller, Stephen D.

doi:10.1017/s0890037x00024970

Cited by 33 publications

(26 citation statements)

References 7 publications

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“…Wide row spacing initially provides weeds an advantage over sunflowers. Durgan et al (1990) [4] found that season-long competition by kochia at densities of 0.3, 1, 3, and 6 plants·m −1 of row decreased sunflower seed yield by 7%, 10%, 20%, and 27%, respectively. Holman (2004) [5] reported as much as 57% yield loss in sunflowers due to Persian darnel (Loliumpersicum Boiss.…”

Section: Introductionmentioning

confidence: 98%

Weed Control and Crop Safety with Premixed S-Metolachlor and Sulfentrazone in Sunflower

Reddy¹,

Stahlman²,

Geier³

et al. 2012

AJPS

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) were compared to single rates of S-metolachlor and pendimethalin, and applied 21 days preplant versus preemergence (PRE). F7583 at ≥1100 g·ha −1 applied preplant or PRE controlled Palmer amaranth (Amaranthus palmeri S. Wats.) and kochia [Kochia scoparia (L.) Schrad.] ≥95% and 100%, respectively in neutral pH soils. In slightly acidic soils, PRE application of F7583 was more effective against Palmer amaranth and grass weeds compared to preplant application. No benefit was gained by increasing the rate of F7583 from 1100 to 1350 g·ha −1 at either application timing. Puncturevine (Tribulus terrestris L.) control was not commercially satisfactory with F7583 at any rate or time of application. Both S-metolachlor at 1070 g·ha −1 and pendimethalin at 1600 g·ha −1 applied either preplant or PRE were considerably less effective on all three broadleaf weeds compared to F7583 treatments. Individually, S-metolachlor and pendimethalin were more effective when applied PRE compared to preplant application. F7583 did not reduce sunflower plant population or visibly injure sunflower anytime during the season.

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Section: Introductionmentioning

confidence: 98%

Weed Control and Crop Safety with Premixed S-Metolachlor and Sulfentrazone in Sunflower

Reddy¹,

Stahlman²,

Geier³

et al. 2012

AJPS

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“…Weed interference can reduce seed yield of sunflower, with level of yield loss varying among weed species (Durgan et al 1990;Onofri & Tei 1994;Carranza et al 1995). According to Wanjari et al (2001), the critical weed-free period is between the 20 th and 49 th day after sowing.…”

mentioning

confidence: 99%

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Jursík¹,

Soukup²,

Holec³

et al. 2015

Plant Prot. Sci.

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Jursík M., Soukup J., Holec J., Andr J., Hamouzová K. (2015): Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions. Plant Protect. Sci., 51: 214-222.We ranked the most frequently used pre-emergent herbicides in sunflower (Helianthus annuus) according to their efficacy and selectivity under different soil moisture conditions within 2008-2011. The efficacy of oxyfluorfen, aclonifen, acetochlor, dimethenamid, and propisochlor on the majority of weeds (Chenopodium album, Echinochloa crus-galli, Amaranthus retroflexus, Mercurialis annua, and Solanum physalifolium) was only slightly affected by the soil moisture and these herbicides can be used in arid and semiarid regions. The efficacy of linuron, prosulfocarb, and pethoxamid was strongly affected by soil moisture and was insufficient under dry conditions. The majority of herbicides showed good selectivity for sunflower. Crop injury rate of 5-15% was recorded after application of flurochloridone and acetochlor. For flurochloridone, the phytotoxicity increased due to irrigation after herbicide application. The highest sunflower injury rate (27-35%) was recorded after application of oxyfluorfen.

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“…Sunflower (Helianthus annuus) has a medium tolerance for weeds because of their lower competition ability; however, data from certain authors suggest differently (Durgan et al 1990, Onofri and Tei 1994, Carranza et al 1995, Lehoczky et al 2006). According to Wanjari et al (2001), the critical weed free period is between the 20 th and 49 th day after sowing.…”

mentioning

confidence: 99%

Efficacy and selectivity of post-emergent application of flumioxazin and oxyfluorfen in sunflower

Jursík¹,

Andr²,

Holec³

et al. 2011

PLANT SOIL ENVIRON

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Four efficacy and selectivity small plot field trials were carried out in four sunflower hybrids at two localities in Middle Bohemia during 2008 and 2009 with herbicides containing the active ingredients flumioxazin and fluorochloridone. For Chenopodium album, an efficacy of 97% was found after pre-emergent application of fluorochloridone + acetochlor; the efficacy of oxyfluorfen was 88-95%; the efficacy of flumioxazin was below 50% at both tested application rates (30 and 60 g/ha) and application timings (2 sunflower leaves and 4 to 6 sunflower leaves); efficacy of flumioxazin increased to 67% and 69%, when surfactants were added (isodecyl alcohol ethoxylate and heptamethyltrisiloxan). Full control of Amaranthus retroflexus was found after all pre-emergent and early post-emergent herbicide treatments; efficacy of late post-emergent herbicide treatments was below 93%. Full control of Mercurialis annua was found only after application of oxyfluorfen. Thlaspi arvense was fully controlled by fluorochloridone + acetochlor (pre-emergent) and oxyfluorfen (in both application terms). Selectivity of the four tested sunflower hybrids to fluorochloridone + acetochlor, bifenox and flumioxazin was acceptable (phytotoxicity 6 to 27%). Higher phytotoxicity (23-45%) was recorded when surfactants were added to flumioxazin. The highest phytotoxicity (68-81%) was recorded after the application of oxyfluorfen.

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Kochia (Kochia scoparia) Interference in Sunflower (Helianthus annuus)

Cited by 33 publications

References 7 publications

Weed Control and Crop Safety with Premixed <i>S</i>-Metolachlor and Sulfentrazone in Sunflower

Weed Control and Crop Safety with Premixed <i>S</i>-Metolachlor and Sulfentrazone in Sunflower

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Efficacy and selectivity of post-emergent application of flumioxazin and oxyfluorfen in sunflower

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Kochia (Kochia scoparia) Interference in Sunflower (Helianthus annuus)

Cited by 33 publications

References 7 publications

Weed Control and Crop Safety with Premixed &lt;i&gt;S&lt;/i&gt;-Metolachlor and Sulfentrazone in Sunflower

Weed Control and Crop Safety with Premixed &lt;i&gt;S&lt;/i&gt;-Metolachlor and Sulfentrazone in Sunflower

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Efficacy and selectivity of post-emergent application of flumioxazin and oxyfluorfen in sunflower

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Weed Control and Crop Safety with Premixed <i>S</i>-Metolachlor and Sulfentrazone in Sunflower

Weed Control and Crop Safety with Premixed <i>S</i>-Metolachlor and Sulfentrazone in Sunflower