Factors Influencing the Biocontrol of Tumble Pigweed (<i>Amaranthus albus</i>) with<i>Aposphaeria amaranthi</i>

Mintz, A. S.; Heiny, Dana Kelly; Weidemann, G. J.

doi:10.1094/pd-76-0267

Cited by 32 publications

(15 citation statements)

References 0 publications

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“…& Barth., another fungal species in North America, killed seedlings of A. retroflexus and A. albus L. within 2 d of inoculation at 1 x 10 6 conidia mL -1 and an 8 h dew period at 28ºC in the growth chamber (Mintz et al 1992;Mintz and Weidemann 1995). In the field, 73% of A. retroflexus seedlings were killed when sprayed to run off with A. amaranthi at 1 x 10 6 conidia mL -1 (Mintz et al 1992;Mintz and Weidemann 1995).…”

Section: Amaranthus Powellii-no Informationmentioning

confidence: 99%

The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

Costea¹,

Weaver²,

Tardif³

2004

Can. J. Plant Sci.

153

108

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The three species are noxious weeds introduced to Canada from southern North America. Their geographical distribution has remained almost unchanged since the original paper published in 1980. The plants exhibit a high phenotypic plasticity and genetic variability and they easily adapt to a multitude of agrestal and ruderal habitats. The seeds contribute to a persistent seed bank; they exhibit a variable dormancy and polymorph germination as a result of maternal, genetic and environmental factors. Growth is rapid and plants produce a large number of viable seeds. The three species have developed multiple resistance to triazine and acetolactate-synthase-inhibiting herbicides. They are alternate hosts to many insects, nematodes, viruses, bacteria and fungi that affect cultivated plants.

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Section: Amaranthus Powellii-no Informationmentioning

confidence: 99%

The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

Costea¹,

Weaver²,

Tardif³

2004

Can. J. Plant Sci.

153

108

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“…For example, several vegetable oils have enhanced the biological weed control efficacy of various weed:pathosystems (Mintz et al 1992;Auld 1993;Boyette 1994;Yang and Jong 1995;Yang et al 1998;Sandrin et al 2003;Boyette et al 2007). Womack and Burge (1993) suggested that vegetable oils may increase spore germination, germ-tube elongation, and appressorium formation, and protect the spores and germ tubes from adverse environmental conditions, as well as possibly reducing host resistance factors.…”

Section: Resultsmentioning

confidence: 99%

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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“…No controle biológico de plantas terrestres, Mintz et al (1992) (Figueiredo et al, 1992a;Figueiredo et al, 1992b), respectivamente, são exemplos clássicos de plantas daninhas consistentemente controladas na fase inicial de desenvolvimento.…”

Section: Concentração De Inóculounclassified

Influência da concentração de inóculo e da idade da planta na intensidade de doença causada por Fusarium graminearum em Egeria densa e E. najas

Neto¹,

Gorgati

Pitelli³

2004

Fitopatol. bras.

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Um isolado de Fusarium graminearum estudado na UNESP/Campus de Jaboticabal, onde foi comprovada sua eficácia no controle de Egeria densa e E. najas, macrófitas aquáticas submersas. Para estudar o efeito de diferentes concentrações do inóculo na severidade de doença, foram conduzidos experimentos em incubadoras para BOD, com concentrações variando em um décimo, de 0,1 até 1,4 g/l de arroz moído colonizado com F. graminearum. Para verificar os possíveis efeitos da idade da planta sobre a severidade de doença, plantas com, no mínimo 35 cm, de comprimento foram excisadas em segmentos correspondentes às idades de crescimento. Os tratamentos com concentrações de inóculo a partir de 0,5 g/l apresentaram sintomas. Todos os tratamentos inoculados com o fungo, nas concentrações a partir de 0,5 g/l, apresentaram drástica redução na produção de biomassa fresca. Todos os segmentos utilizados como plantas-teste (0 a 32 cm de comprimento) apresentaram suscetibilidade ao fungo. Os ponteiros de plantas de ambas as espécies apresentaram maior severidade de sintomas no sexto e oitavo dias após a inoculação, contudo, os segmentos correspondentes às idades 2 e 3 apresentaram maior redução de biomassa fresca quando inoculadas, apesar de não apresentarem sintomas tão severos quanto a idade 1. Com relação ao ganho de biomassa fresca, as testemunhas apresentaram sempre maior crescimento do que os respectivos tratamentos inoculados, contudo os segmentos correspondentes à idade 4 apresentaram menor ganho de biomassa fresca do que as demais idades.

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Factors Influencing the Biocontrol of Tumble Pigweed (Amaranthus albus) withAposphaeria amaranthi

Cited by 32 publications

References 0 publications

The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

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

Influência da concentração de inóculo e da idade da planta na intensidade de doença causada por Fusarium graminearum em Egeria densa e E. najas

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