Efficacy ofColletotrichum coccodesand Thidiazuron for Velvetleaf (Abutilon theophrasti) Control in Soybean (Glycine max)

Hodgson, Richard H.; Wymore, L. A.; Snyder, Robert H.; Collette, Anne

doi:10.1017/s0890037x00032292

Cited by 26 publications

(22 citation statements)

References 6 publications

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“…Hughes was noticeably less effective in field trials (Wymore et al 1987;Wymore and Watson, 1989). Reduced efficacy may often be a result of lower biocontrol performance under less favourable field environments (Leger et al 2001;Netland et al 2001;Chandramohan et al 2002) and increased tolerance of plants (Hodgson et al 1988). Nevertheless, this study identified the Sencor-Ct tank mix with potential to widen the application window, as opposed to the use of the herbicide alone, for control of scentless chamomile in field.…”

Section: Discussionmentioning

confidence: 99%

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Graham¹,

Peng²,

Bailey³

et al. 2006

BioControl

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Colletotrichum truncatum (Ct) was examined in a tank mix with the herbicide 2,4-D, clopyralid plus MCPA (Caurtail M Ò ), or metribuzin (Sencor Ò ) for control of scentless chamomile at 8-(younger) and 11-leaf stages (older) under controlled conditions. In initial trials, Ct at 7 Â 10 6 spores/ml (200 l/ha) reduced the fresh weight of scentless chamomile only slightly. However, its combinations with herbicides improved the efficacy variably depending on the herbicide used and stage of the weeds. Ct plus 2,4-D reduced the fresh weight by about 50% at both leaf stages of scentless chamomile when compared to untreated controls but no plants were killed. The fungus plus Curtail M consistently killed younger but not older plants, and the efficacy was substantially greater than that of the herbicide alone. The herbicide Sencor was highly effective on younger plants, and adding Ct did not achieve additional benefits. On older plants, however, Ct plus Sencor was substantially more effective than the herbicide alone, causing 76% fresh-weight reduction when compared to controls and killing 9 out of 16 older plants in four trials. Sencor applied alone reduced the fresh weight of older plants by 65%, but no plants were killed. Tested at doses ranging from 2 Â 10 6 to 20 Â 10 6 spores/ml, Ct plus Curtail M was most effective at the highest fungal inoculum dose, consistently killing younger but not older plants. In comparison, Ct at a medium dose (7 Â 10 6 spores/ml) plus Sencor killed the majority of older chamomile plants (7 out of 12), whereas the herbicide alone did not cause plant mortality. Further increasing fungal inoculum dose from this medium level did not enhance the weed control by Ct plus Sencor.

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Section: Discussionmentioning

confidence: 99%

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Graham¹,

Peng²,

Bailey³

et al. 2006

BioControl

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“…increased pathogen infection and weed control compared with either component applied alone (Wymore et al . 1987; Hodgson et al . 1988; Wymore & Watson 1989).…”

Section: Introductionmentioning

confidence: 99%

“…and the plant growth regulator, thidiazuron (N-phenyl-NЈ-1,2,3-thiadiazol-5-yl-urea), to velvetleaf (Abutilon theophrasti Medic.) increased pathogen infection and weed control compared with either component applied alone (Wymore et al 1987;Hodgson et al 1988;Wymore & Watson 1989). Heiny (1994) found that Phoma proboscis Heiny, at 1 ¥ 10 7 spores mL -1 and applied with 2,4-D ([2,4-dichlorophenoxy]acetic acid) plus MCPP (2-[4-chloro-2-methylphenoxy]propanoic acid) at sublethal rates controlled field bindweed (Convolvulus arvensis L.) more effectively than the herbicide mixture alone and as effectively as the pathogen at a 10-fold higher rate.…”

Section: Introductionmentioning

confidence: 99%

Redvine (Brunnichia ovata) and trumpetcreeper (Campsis radicans) controlled under field conditions by a synergistic interaction of the bioherbicide, Myrothecium verrucaria, with glyphosate

Boyette¹,

Hoagland

Weaver

et al. 2008

Weed Biology and Management

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Redvine (Brunnichia ovata) and trumpetcreeper (Campsis radicans) controlled under field conditions by a synergistic interaction of the bioherbicide,Myrothecium verrucaria, with glyphosate In field experiments conducted near Stoneville, MS, USA, in 2000 and 2001, the bioherbicidal fungus, Myrothecium verrucaria (Alb. & Schwein.) Ditmar: Fr., was tested alone and in combination with a glyphosate (N-[phosphonomethyl]glycine) product for controlling natural infestations of the invasive vines, redvine (Brunnichia ovata [Walt.] Shinners) and trumpetcreeper (Campsis radicans [L.] Seem. ex Bureau). After 12 days, redvine and trumpetcreeper were controlled by 88% and 90%, respectively, through a synergistic interaction between the fungus and the herbicide, glyphosate.The disease symptomatology was characterized by rapid necrosis of the leaf and stem tissues, with mortality occurring within 72 h. Neither glyphosate alone, nor M. verrucaria alone, controlled these weeds at commercially acceptable levels (Ն80%). No visual disease or herbicide damage occurred to the soybean in the treated test plots 12 days after planting.These results suggest that some formulations of glyphosate, mixed with M. verrucaria, can effectively control redvine and trumpetcreeper.

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“…Improved weed control has been reported for combined uses of fungal pathogens with synthetic herbicides (Christy et al 1993;Heiny 1994;Hodgson et al 1988;Peng and Byer 2005). Several Colletotrichum species, including C. truncatum, C. gloeosporioides (Penz) Sacc., and C. coccodes (Wallr.)…”

Section: Introductionmentioning

confidence: 99%

Interactions ofColletotrichum truncatumwith Herbicides for Control of Scentless Chamomile (Matricaria perforata)

et al. 2006

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A host-specific fungusColletotrichum truncatumstrain 00-3B1 (Ct) was mixed with herbicides to improve the control of scentless chamomile, a noxious weed in western Canada. The compatibility of Ct conidia (spores) with herbicides was evaluated in vitro, and varying effects were observed with different products on spore germination. Clodinafop, glufosinate, MCPA, and 2,4-D ester were relatively benign and delayed the germination slightly, whereas dicamba, imazethapyr, metribuzin, and 2,4-D amine were noticeably more inhibitive. Bromoxynil, glyphosate, sethoxydim, and Merge®(spray adjuvant) were most inhibitive, showing >50% inhibition after 24 h. To determine potential synergy, Ct was applied at 7 × 106spores/ml in tank mixtures with selected herbicides at 1× and 0.1× registered rates under greenhouse conditions. Combining Ct with MCPA, 2,4-D ester, clopyralid, or metribuzin at 1× rate resulted in synergistic or additive interaction on scentless chamomile, increasing weed control significantly when compared to Ct or herbicides applied alone. Similar applications of Ct with imazethapyr, 2,4-D amine, dicamba, or glyphosate were antagonistic. Treatments with Ct plus 1× metribuzin killed scentless chamomile completely, whereas neither Ct nor the herbicide alone caused plant death, suggesting the value of this tank mixture.

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Efficacy ofColletotrichum coccodesand Thidiazuron for Velvetleaf (Abutilon theophrasti) Control in Soybean (Glycine max)

Cited by 26 publications

References 6 publications

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Redvine (Brunnichia ovata) and trumpetcreeper (Campsis radicans) controlled under field conditions by a synergistic interaction of the bioherbicide, Myrothecium verrucaria, with glyphosate

Interactions ofColletotrichum truncatumwith Herbicides for Control of Scentless Chamomile (Matricaria perforata)

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