Challenges And Strategies For Development Of Mycoherbicides

Boyetchko, S. M.; Peng, Gao; Arora, D. K.

doi:10.1201/9780203913369.ch10

Cited by 20 publications

(26 citation statements)

References 30 publications

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“…When a large number of winter-annual plants of scentless chamomile are present, Sencor plus Ct may be more effective if the crop stage is suitable. Applications prior to the critical period for crop development is vital to diminish weed competition (Boyetchko and Peng, 2004), and this timing may be of greater importance in spring wheat on which scentless chamomile has demonstrated more substantial yield reduction than on winter wheat (Douglas et al, 1992).…”

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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“…We also wish to examine the effects of surfactants and other adjuvants to improve the efficacy and use of mycelial formulations of this organism for control of Commelina spp. Possible interactions (synergistic, additive or antagonistic) of this pathogen with herbicides will be examined since important synergistic interactions of other plant pathogens with herbicides have been discovered [32,53,54]. Furthermore, since another pathogen (C. gloeosporioides f. sp.…”

Section: Discussionmentioning

confidence: 99%

“…Complete mortality (100%) was not achieved at any dew period, but many plants were severely stunted, which resulted in greatly reduced dry weight. Lengthy dew periods are commonly required for most bioherbicidal plant pathogens [32]. This factor has been a major constraint for commercial development of these biocontrol organisms [38].…”

Section: Effects Of Dew Period Duration On Weed Control and Dry Weighmentioning

confidence: 99%

“…The objectives of these studies were to isolate and examine this pathogen with respect to its growth and germination on various growth media, correlate inoculum concentration and bioherbicidal activity (inundative application) with plant growth stage, develop time courses for weed control and disease progression on C. diffusa, and evaluate weed control under field conditions. Knowledge of these basic parameters is essential for evaluating a plant pathogen as a bioherbicide for weed control [32]. …”

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Biological Control of Spreading Dayflower (Commelina diffusa) with the Fungal Pathogen Phoma commelinicola

2015

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Greenhouse and field experiments showed that conidia of the fungal pathogen, Phoma commelinicola, exhibited bioherbicidal activity against spreading dayflower (Commelina diffusa) seedlings when applied at concentrations of 10 6 to 10 9 conidia· mL −1 .Greenhouse tests determined an optimal temperature for conidial germination of 25 °C -30 °C, and that sporulation occurred on several solid growth media. A dew period of ≥ 12 h was required to achieve 60% control of cotyledonary-first leaf growth stage seedlings when applications of 10 8 conidia· mL −1 were applied. Maximal control (80%) required longer dew periods (21 h) and 90% plant dry weight reduction occurred at this dew period duration. More efficacious control occurred on younger plants (cotyledonary-first leaf growth stage) than older, larger plants. Mortality and dry weight reduction values in field experiments were ~70% and >80%, respectively, when cotyledonary-third leaf growth stage seedlings were sprayed with 10 8 or 10 9 conidia· mL −1 . These results indicate that this fungus has potential as a biological control agent for controlling this problematic weed that is tolerant to the herbicide glyphosate.

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“…As alternatives to synthetic herbicides, plant pathogens have been evaluated as weed control agents (Charudattan 2001, 2005; Hoagland 2001; Boyetchko et al . 2002; Boyetchko & Peng 2004; Hallett 2005). The concept of combining microbial herbicides with chemical herbicides has been the subject of considerable research.…”

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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Challenges And Strategies For Development Of Mycoherbicides

Cited by 20 publications

References 30 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

Biological Control of Spreading Dayflower (Commelina diffusa) with the Fungal Pathogen Phoma commelinicola

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

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