First Report of Colletotrichum coccodes on Velvetleaf

Gotlieb, A. R.; Watson, A. K.; Poirier, C.

doi:10.1094/pd-71-0281a

Cited by 23 publications

(4 citation statements)

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“…Most reports have focused on specificity at the genus or family levels (Chesters & Hornby, 1965;Mordue, 1967;Andersen & Walker, 1985;Maas & Howard, 1985;Raid & Pennypacker, 1987;Gotlieb et al, 1987), and a few studies have been devoted to comparisons of the pathogenicity of different isolates to a single Plant Pathology (1998) 47, 440-445 ᮊ 1998 BSPP potato cultivar (Barkdoll et al, 1990;Barkdoll & Davis, 1992) and to the assessment of the susceptibility of potato cultivars to an unspecified (Thirumalachar, 1967), uncharacterized (Read, 1991), or natural, uncontrolled inoculum (Andrivon et al, 1997). However, data on the reaction of a set of cultivars to different, well-characterized isolates of the fungus are lacking.…”

Section: Introductionmentioning

confidence: 99%

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Andrivon¹,

Lucas²,

Guérin³

et al. 1998

Plant Pathology

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In an attempt to better understand the importance of tuber-borne inoculum in black dot development, several potato cultivars were inoculated with various Colletotrichum coccodes isolates. Symptoms developed first on underground organs (starting 2 weeks after inoculation on roots, and later on stolons and tubers) of inoculated plants; stem infections developed only after 7-10 weeks, depending on the cultivar. Infection with C. coccodes resulted in a reduction in numbers of stolons and tubers in cv. Bintje, but not in the later maturing cv. Roseval. Significant isolate by cultivar interactions were detected from the analysis of root symptoms after inoculation of three potato cultivars (Bintje, Spunta and Desiree) with five C. coccodes isolates. Such an interaction was also detected for stolon/tuber symptoms at the latest scoring date (98 days after inoculation), but not at earlier dates (58, 70 and 84 days after inoculation). These results suggest that protocols based on root colonization might be used for investigating cultivar response to black dot and pathogenicity of C. coccodes isolates, and that some specificity exists in the reaction of potato genotypes to this pathogenic fungus.

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Section: Introductionmentioning

confidence: 99%

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Andrivon¹,

Lucas²,

Guérin³

et al. 1998

Plant Pathology

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“…LubaoNo.l dodder Yang, 1990 Colletotrichum coccodes velvetleaf Gotlieb et al, 1987; Wymore et al, 1987Wymore et al, , 1988Wymore and Watson, 1989 C. orbiculare Bathurst burr Auld et al, 1990 C. truncatum hemp sesbania Boyette 1991aBoyette , 1991b Dactylaria higginsii purple nutsedge Kadir et al, 1997a,b …”

Section: Foliar Biological Control Agentsmentioning

confidence: 99%

Innovative Applications of Microbial Agents for Biological Weed Control

Boyetchko

1999

Biotechnological Approaches in Biocontrol of Plant Pathogens

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“…C. coccodes belongs to this category. C. coccodes, isolated from A. theophrasti is specific to velvetleaf, but its weak virulence to velvetleaf has hindered commercialization (Gotlieb et al, 1987;Amsellem et al, 2002). There has been significant research to develop C. coccodes as effective biological control agents.…”

Section: Introductionmentioning

confidence: 99%

Enzyme Responses of Abutilon Theophrasti in an Enhanced Biocontrol System

2005

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Weak virulence has limited the development of Colletorichum coccodes (Wallr.) Hughes (DAOM 183088) as a bioherbicide for Abutilon theophrasti Medik. (velvetleaf) control. This study examines the role of chemical synergy to suppress host defense mechanisms. Dry weight of A. theophrasti was reduced by treatment with C. coccodes in a tank-mix with 0.25 kg a.i. ha )1 bentazon more than by the treatment with C. coccodes or bentazon alone, while the effect of a sub-lethal rate of glyphosate was not significant. C. coccodes did not affect phenylalanine ammonia lyase (PAL) activity in infected leaves of A. theophrasti, whereas PAL activity was significantly inhibited by the presence of bentazon 5 days after treatment. The inhibition was stronger when bentazon was applied alone than when bentazon was applied with C. coccodes. Treatment with glyphosate or a mixture of glyphosate and C. coccodes did not affect PAL activity. Peroxidase activity was strongly induced by C. coccodes treatment and increased over time. Peroxidase activity was not induced by 0.25 kg a.i. ha )1 bentazon alone. However, when bentazon was applied in combination with C. coccodes, it prevented the activation of peroxidase by C. coccodes infection. Treatment with 0.2 kg a.i. ha )1 glyphosate did not affect peroxidase activity. These results suggest that these enzymes are involved in the resistance mechanism of A. theophrasti, and the synergistic effect of bentazon on C. coccodes efficacy as a bioherbicide may result from suppressing the activation of these defense-related enzymes.

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First Report of Colletotrichum coccodes on Velvetleaf

Cited by 23 publications

References 0 publications

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Innovative Applications of Microbial Agents for Biological Weed Control

Enzyme Responses of Abutilon Theophrasti in an Enhanced Biocontrol System

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