Soybean and sunflower oils increase the infectivity of Colletotrichum gloeosporioides f. sp. aeschynomene to Northern Jointvetch

Sandrin, Todd R.; TeBeest, D. O.; Weidemann, G. J.

doi:10.1016/s1049-9644(02)00156-1

Cited by 21 publications

(23 citation statements)

References 13 publications

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“…The disease symptomatology was similar to that occurring on northern jointvetch infected by C. gloeosporioides f. sp. aeschynomene (Daniel et al 1973;Sandrin et al 2003). Stem tissues of untreated hemp sesbania are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…When re-inoculated onto healthy northern jointvetch seedlings, the fungus was highly virulent, causing 100% mortality of northern jointvetch plants within 7 days, while the un-inoculated control plants remained healthy (data not shown). Koch's postulates (1893) maintain, that for disease causation to be (Sandrin et al 2003) was used to estimate disease progression where: 0 no disease, 1 1-25% disease, 2 26-50% disease, 3 51-75% disease, 4 76-99% disease, and 5 complete plant death. Symptomatology was considered ''severe'' at ratings of 3.5-5.0.…”

Section: Resultsmentioning

confidence: 99%

“…A subjective visual disease severity rating scale (per plant basis; Sandrin et al 2003) was used to estimate disease progression where 0 = no disease, 1 = 1-25% disease, 2 = 26-50% disease, 3 = 51-75% disease, 4 = 76-99% disease, and 5 = complete plant death. Percent control, plant height and biomass reductions were determined after 21 days.…”

Section: Greenhouse Experimentsmentioning

confidence: 99%

“…It was reregistered with US-EPA in 1997 and more recently, this fungus was newly registered under the trade-name Lockdown TM for the control of northern jointvetch (Cartwright et al 2008). The fungus induces anthracnose lesions on northern jointvetch that increase in severity over a several week period under field conditions, eventually killing infected weeds as the lesions formed by the fungus girdle the stem (Sandrin et al 2003).…”

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confidence: 99%

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Induction of infection in Sesbania exaltata by Colletotrichum gloeosporioides f. sp. aeschynomene formulated in an invert emulsion

Boyette

Bowling

Vaughn

et al. 2009

World J Microbiol Biotechnol

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In greenhouse experiments, an invert emulsion (MSG 8.25) was tested with spores of the mycoherbicidal fungus Colletotrichum gloeosporioides f. sp. aeschynomene, a highly virulent pathogen of the leguminous weed Aeschynomene virginica (northern jointvetch), but considered ''immune'' against another leguminous weed, Sesbania exaltata (hemp sesbania). A 1:1 (v/v) fungus/invert emulsion mixture resulted in 100% infection and mortality of inoculated hemp sesbania seedlings over a 21 day period. Microscopic examinations revealed that the fungus proliferated within the cells of hemp sesbania and produced anthracnose lesions containing acervuli on infected stems. The fungus was reisolated and found to infect and kill northern jointvetch seedlings, thus fulfilling Koch's postulates for disease identification. These results suggest that this invert emulsion expands the host range of C. gloeosporioides f. sp. aeschynomene, and possibly improves the bioherbicidal potential of this pathogen.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Greenhouse Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Induction of infection in Sesbania exaltata by Colletotrichum gloeosporioides f. sp. aeschynomene formulated in an invert emulsion

Boyette

Bowling

Vaughn

et al. 2009

World J Microbiol Biotechnol

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“…Seeds were surface-sterilized in 0.05% NaOCl for 5 min, rinsed with sterile distilled water, and germinated on moistened filter paper in petri dishes. After the seeds germinated (~48 h), they were planted in a commercial potting mix (Jif- [19] was used to estimate disease progression where 0 = no disease, 1 = 1% -25% disease, 2 = 26% -50% disease, 3 = 51% -75% disease, 4 = 76% -99% disease, and 5 = plant death. Disease ratings ≤ 2.0 were considered "slight", 2.1 -3.9 were considered "moderate", and ≥ 4.0 were considered "severe".…”

Section: Culture Of Plantsmentioning

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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The mechanism of the mycoinsecticide diluent on the efficacy of the oil formulation of insecticidal fungus

Peng

Xia

2011

BioControl

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Soybean and sunflower oils increase the infectivity of Colletotrichum gloeosporioides f. sp. aeschynomene to Northern Jointvetch

Cited by 21 publications

References 13 publications

Induction of infection in Sesbania exaltata by Colletotrichum gloeosporioides f. sp. aeschynomene formulated in an invert emulsion

Induction of infection in Sesbania exaltata by Colletotrichum gloeosporioides f. sp. aeschynomene formulated in an invert emulsion

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

The mechanism of the mycoinsecticide diluent on the efficacy of the oil formulation of insecticidal fungus

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