Bioherbicides for weed control.

Weaver, Mark A.; Lyn, Margaret E.; Boyette, C. Douglas; Hoagland, Robert E.

doi:10.1079/9781845932909.0093

Cited by 29 publications

(26 citation statements)

References 89 publications

(79 reference statements)

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“…The major impediment to the development of bioherbicides is the assurance of profitability to commercial investors. And the main limitation to profitability is the cost of production, which for fungi typically involves solid-state or liquid fermentation on some sort of nutrient medium (Weaver et al 2007). Similarly, the most common reason for discontinuation of previously marketed bioherbicides is that the cost of production is too high, and the market too small to justify production costs.…”

Section: Why Are There No Bioherbicides For Cirsium Arvense?mentioning

confidence: 99%

“…While considerable variation is often reported in the discovery and proof-of-concept stages for a potential bioherbicide, much of the variation can be reduced by selecting particular aggressive strains, and by amending the final formulation with adjuvants that enhance and protect the pathogen (Ash 2010;Weaver et al 2007). This was demonstrated for P. cirsii as selected fungal strains were shown to be highly pathogenic (Leth et al 2008), and adjuvants reduced the long necessary dew period that limited its potential (Leth and Andreasen 2000).…”

Section: Müller and Nentwig Claimed That "The Varying And Low Virulenmentioning

confidence: 99%

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Plant pathogens as biocontrol agents for Cirsium arvense – an answer to Müller and Nentwig

Cripps¹,

Bourdôt²,

Bailey³

2012

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Section: Why Are There No Bioherbicides For Cirsium Arvense?mentioning

confidence: 99%

Section: Müller and Nentwig Claimed That "The Varying And Low Virulenmentioning

confidence: 99%

Plant pathogens as biocontrol agents for Cirsium arvense – an answer to Müller and Nentwig

Cripps¹,

Bourdôt²,

Bailey³

2012

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“…Fungal conidia are the predominant propagules used in bioherbicidal research [26,29,30]. However, mycelial formulations of various fungal bioherbicides, including Phoma spp., have shown weed control potential against some important weeds.…”

Section: Disease Progression Of P Commelinicola On C Diffusa Under mentioning

confidence: 99%

“…The use of bioherbicides has been recognized as a potential technological alternative to chemical herbicides in certain situations, and global interest exists in the bioherbicide concept, with active research and development projects established by commercial entities in the U.S., Canada, Europe, Australia, Japan, and other countries [26][27][28][29][30].…”

mentioning

confidence: 99%

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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“…In order to achieve greater predictability and acceptability, it is necessary to maximize the capability of a bioherbicidal pathogen to infect, kill, or reduce the competitiveness of the weed host. Many fungi, including most bioherbicidal fungi, have a requirement for free water, such as dew, for germination and infection to occur [7] [11] [12]. Increasing the infectivity (ability to infect host) of a bioherbicidal fungus in any given dew period, theoretically will increase the effectiveness of pathogen [13].…”

Section: Introductionmentioning

confidence: 99%

Efficacy Improvement of a Bioherbicidal Fungus Using a Formulation-Based Approach

Boyette¹,

Hoagland²,

Stetina³

2016

AJPS

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Greenhouse experiments were conducted to determine the effects of an invert (water-in-oil) emulsion (IE) on dew period duration and dew delay of Colletotrichum coccodes for biocontrol of the problematic weed, eastern black nightshade (Solanum ptycanthum). Dew periods of 4, 8, or 12 h provided 10%, 25%, and 40% control of eastern black nightshade plants, respectively, when C. coccodes (Strain NRRL 15,547) spores were applied in water + Tween 80 surfactant 12 days after inoculation, but a minimum of 16 h of dew was required to achieve ~95% plant mortality. In contrast, at these same intervals of dew, 95%, 100% and 100% mortality occurred, respectively, when fungal spores were formulated in the IE. Even in the absence of dew, 60% mortality and 70% dry weight reductions of plants was achieved with the fungus/IE formulation Delaying dew by 2 h after inoculation did not significantly reduce weed control or plant dry weight reductions when plants were inoculated with the fungus either in the aqueous or in the IE formulation. However, when dew was delayed for 4, 8, or 12 h, only 60%, 50%, and 25% mortality, respectively, of plants receiving the aqueous spore treatment occurred. In contrast, 95%, 90%, and 90% weed mortality occurred after the same dew delays of plants receiving the fungus/IE treatments. These results demonstrate that formulating C. coccodes spores in an invert emulsion greatly improves the bioherbicidal potential of this fungus. Furthermore, results suggest that this formulation may render pathogens previously rejected for development as bioherbicides due to restrictive dew requirements more efficacious for use in controlling their target weeds.

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Bioherbicides for weed control.

Cited by 29 publications

References 89 publications

Plant pathogens as biocontrol agents for Cirsium arvense – an answer to Müller and Nentwig

Plant pathogens as biocontrol agents for Cirsium arvense – an answer to Müller and Nentwig

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

Efficacy Improvement of a Bioherbicidal Fungus Using a Formulation-Based Approach

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