<i>Ascochyta cypericola</i> sp.nov. causing leaf blight of purple nutsedge (<i>Cyperus rotundus</i>)

Upadhyay, Rajeev K.; Kenfield, Doug S.; Strobel, Gary A.; Hess, W. M.

doi:10.1139/b91-103

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…According to USEPA, biopesticides are certain types of pesticide derived from natural materials such as animals, plants, bacteria and certain minerals . In the field of weed biocontrol, some studies have highlighted the potential use of toxins produced by some phytopathogenetic species of the genus Ascochyta . In particular, A. caulina produces low‐molecular‐weight hydrophilic phytotoxins (ascaulitoxin, its aglycone and 4‐aminoproline) in liquid culture.…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicological characterisation of a mycoherbicide mixture isolated from the fungus Ascochyta caulina

Fumagalli

Andolfi

Avolio

et al. 2013

Pest Management Science

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The present study has provided baseline information needed to assess the potential hazard of the fungal toxins of A. caulina. In particular, the acute and chronic effects on aquatic (algae, Daphnia and fish) and terrestrial organisms (earthworms) have been highlighted. Finally, a comparison of the inherent toxicity of ACTs with other synthetic herbicides has shown comparative ecotoxicity of the tested mixture.

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Section: Introductionmentioning

confidence: 99%

Ecotoxicological characterisation of a mycoherbicide mixture isolated from the fungus Ascochyta caulina

Fumagalli

Andolfi

Avolio

et al. 2013

Pest Management Science

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“…Infestations are extremely difficult to control through mechanical methods, and chemical control has either been ineffective or limited by cost, environmental or management problems associated with the most promising products. This weed has been a target by several biological control programmes involving insect (Frick and Quimby, 1977;Frick et al, 1979;Phatak et al, 1987) and fungal (Phatak et al, 1982;Upadhyay et al, 1991;Prakash et al, 1996;Neto, 1997;Okoli et al, 1997;Ribeiro et al, 1997;Kadir et al, 1999Kadir et al, , 2000aRosskopf et al, 1999;Kadir and Charudattan, 2000) natural enemies. Although some experimental results have been particularly promising, no commercial mycoherbicide is available, and there are no classical biological control agents in the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting mass production of Duosporium yamadanum in rice grains.

Macedo¹,

Barreto²,

Pomella³

et al. 2008

Proceedings of the XII International Symposium on Biological Control of Weeds, La Grande Motte, France, 22-27 April, 2007

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Duosporium yamadanum (Matsuura) Tsuda & Ueyama is a pathogenic fungus that attacks purple nutsedge, Cyperus rotundus, L. in Brazil. Occasionally, it is found causing severe natural epiphytotics of leaf blight on that host in the field. Exploratory studies have already indicated that this fungus has potential for the development of a mycoherbicide. To help confirm its potential, we studied mass production of inoculum of D. yamadanum in solid fermentation using polished rice as the substrate for cultivation of D. yamadanum. The effects of the following factors were investigated for their influence on conidial production: water content, length of incubation period before the opening of the plastic bags containing the substrate and addition of supplements to the substrate. Maximum production of conidia was obtained with a water content of 40-60% in the substrate (w/v), with average production at each harvest of 2.5 ´ 10 5 conidia per gram of substrate. Water contents above 60% inhibited growth and sporulation. Opening bags containing the inoculated substrate after 3 to 4 days resulted in the highest levels of sporulation; average of 3.0 ´ 10 5 conidia per gram of substrate. The supplementation of the substrate with calcium carbonate did not significantly increase the sporulation levels compared to controls, whereas the addition of urea or sucrose led to a significant reduction in sporulation; average of 9.0 ´ 10 4 conidia per gram of substrate.

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“…O potencial de alguns fungos herbipatógenos tem sido avaliado, baseado em observações de campo (CASTELLANI 1942, PHATAK et al 1983, FREEMAN & CHARUDATTAN 1984, BARRETO & EVANS 1995, WETZSTEIN & PHATAK 1987, STOVALL & CLAY 1988, UPADHAYAY & STROBEL et al 1990, CHARUDATTAN 1991UPADHAYAY et al 1991, TEBEEST et al 1992, BORGES NETO 1997e RIBEIRO et al 1997. BARRETO & EVANS (1995) afirmaram terem sido os primeiros a registrar Cercospora caricis Ouden em plantas de tiririca (Cyperus rotundus), no Brasil.…”

Section: Introductionunclassified

BUSCANDO UM BIOHERBICIDA CONTRA Cyperus sp (tiririca)

Gonzalez

Moraes

2001

RHE

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RESUMOComo alternativa ao controle convencional do Cyperus sp (tiririca) usando produtos químicos, surge o controle biológico, empregando-se microrganismos fitopatógenos. Como resultados da produção massal de Cercospora henningsii e Cercospora caricis através de cultivo submerso em meio de cultura batata-dextrose (BD), observou-se que ambas espécies obtiveram um crescimento ótimo a 36 o C, sendo que para C. henningsii se deu com 72 h de fermentação e para C. caricis com 60 h. Os experimentos de campo, bem como os de Câmara úmida, contra Cyperus sp (tiririca), com os produtos obtidos pelo cultivo submerso de Cercospora sp (C. henningsii e/ou C. caribaea), demonstraram a patogenicidade, ou seja, o potencial bioherbicida desses microrganismos.Palavras-chave: fermentação submersa, controle biológico, erva daninha, tiririca, bioherbicida. ABSTRACTAs an alternative to conventional control of Cyperus sp (herbaceous nutsedge), with chemical products, it rises the biological control, making use of phytopathogenic microorganisms. As results of the whole production of Cercospora henningsii e Cercospora caricis by fermentation in potato-dextrose (PD) liquid medium, it was observed that both species obtained the optimum growth at 36 o C. C. henningsii

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Ascochyta cypericola sp.nov. causing leaf blight of purple nutsedge (Cyperus rotundus)

Abstract: Ascochyta cypericola sp.nov., causing leaf blight of purple nutsedge in India, is described and illustrated. Key words: mycoherbicide, purple nutsedge, fungal pathogen.

Cited by 13 publications

References 3 publications

Ecotoxicological characterisation of a mycoherbicide mixture isolated from the fungus Ascochyta caulina

Ecotoxicological characterisation of a mycoherbicide mixture isolated from the fungus Ascochyta caulina

Factors affecting mass production of Duosporium yamadanum in rice grains.

BUSCANDO UM BIOHERBICIDA CONTRA Cyperus sp (tiririca)

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