Control of Cucumber Downy Mildew by Cyazofamid

Mitani, Shigeru; Kamachi, Ken; Sugimoto, Koji; Araki, Shigeru; Yamaguchi, Tomona

doi:10.1584/jpestics.28.64

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…In each plastic house, 10 plants in each of 30 rows were randomly selected to evaluate the percentage of leaf area affected. Disease severity on leaves was expressed in terms of a disease index (0-4 scale; Mitani et al ., 2003): 0, no disease; 1, 1-5%; 2, 6-25%; 3, 26 -49%; 4, > 50% leaf area affected. Disease severity was expressed by the following formula:…”

Section: Disease Assessmentmentioning

confidence: 99%

Resistance of Pseudoperonospora cubensis to flumorph on cucumber in plastic houses

et al. 2007

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Plastic-house experiments were conducted over a 2-year period to estimate the effects of successive applications of flumorph or a mixture of flumorph with mancozeb to cucumber plants on selection for flumorph resistance in the downy mildew oomycete, Pseudoperonospora cubensis . Application of flumorph alone favoured the selection of resistant isolates of Ps. cubensis . Resistant populations were detected at a frequency of 2·5% after six successive applications of flumorph alone in a plastic house in 2004. Resistant isolates were also detected (4·8%) after eight successive applications of the mixture of flumorph and mancozeb in 2004, although the mixture gave significantly better disease control than flumorph alone and produced a slight delay in the development of resistance. In a second cucumber crop in the same plastic houses in 2004, the frequency of resistant isolates increased to 100% after three successive applications of flumorph or four of flumorph + mancozeb. Under laboratory conditions, most flumorph-resistant isolates showed high levels of resistance and their levels of pathogenicity and sporulation were as high as that of wild-type isolates. Flumorph showed cross-resistance with dimethomorph and iprovalicarb, but not with azoxystrobin, cyazofamid, cymoxanil or metalaxyl. These studies suggest a high risk for the occurrence of resistance to flumorph in Ps. cubensis in cucumber crops under plastic-house conditions.

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Section: Disease Assessmentmentioning

confidence: 99%

Resistance of Pseudoperonospora cubensis to flumorph on cucumber in plastic houses

et al. 2007

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“…This observation is consistent with the results of those from cucumber downy mildew field experiment in Japan. 6) However, in order to fully benefit from its very strong preventative activity, one would have to apply cayzofamid before the infection occurred. Where indicated, mancozeb (1875 mg a.i./ml) with a 7-day application interval (M), cyazofamid (67 mg a.i./ml) with a 10-day interval (C), and fluazinam (333 mg a.i./ml) with a 10-day interval (F), were used.…”

Section: Curative Scheduled Application Field Test In 2000-effect Ofmentioning

confidence: 99%

Control of Potato Late Blight by Cyazofamid

2005

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“…Cyazofamid exhibited no curative activity against P. infestans and moderate activity against P. cubensis in pot tests. However, in some field trials, this fungicide exhibited curative activity against both P. infestans on potato and P. cubensis on cucumber 11–13. Since cyazofamid had high levels of curative activity against S. graminicola on pearl millet in a pot test (Fig.…”

Section: Discussionmentioning

confidence: 96%

“…There are some reports that cyazofamid is best used as a foliar application for potato, grapevine, tomato, cucurbits, onion, lettuce, rice and Chinese cabbage,7–13 but there are no data concerning the effect of cyazofamid against pearl millet downy mildew.…”

Section: Introductionmentioning

confidence: 99%

Activity of cyazofamid against Sclerospora graminicola, a downy mildew disease of pearl millet

Jogaiah

Mitani

Nagaraj

et al. 2007

Pest Management Science

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The efficacy of cyazofamid was tested against pearl millet downy mildew disease caused by Sclerospora graminicola Schroet. Significant inhibition of sporangial sporulation, zoospore release and motility was observed at 0.3 mg mL(-1), and this concentration also provided good fungicidal activity under in vitro conditions. Under glasshouse conditions, none of the concentrations tested, either 0.01-2 mg mL(-1) as seed treatment or 1-10 mg mL(-1) by foliar application, was found to be phytotoxic. The effect of cyazofamid was tested by seed treatment alone, seed treatment followed by foliar application and foliar application alone. Seed treatment with cyazofamid offered only 19.7% disease control, but seed treatment followed by a single foliar application to diseased plants provided good control over disease, seed treatment with two foliar applications was significantly superior and foliar application alone showed a high level of activity, with 10 mg mL(-1) giving 97.9% disease control. Lack of systemic activity of cyazofamid was evident, root treatment giving disease levels on a par with the untreated control. The fungicide exhibited strong curative activity, but only moderate translaminar activity, with only marginal (34.8%) disease control after treatment of the adaxial leaf surface at 10 mg mL(-1). Loss of cyazofamid activity over time was very low, indicating stable residual and rainfastness activity. These results indicate that cyazofamid has a high potential to be an effective fungicide for the control of downy mildew disease of pearl millet.

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Control of Cucumber Downy Mildew by Cyazofamid

Cited by 9 publications

References 6 publications

Resistance of Pseudoperonospora cubensis to flumorph on cucumber in plastic houses

Resistance of Pseudoperonospora cubensis to flumorph on cucumber in plastic houses

Control of Potato Late Blight by Cyazofamid

Activity of cyazofamid against Sclerospora graminicola, a downy mildew disease of pearl millet

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