Reduction of Powdery Mildew and Other Diseases by Over-the-Trellis Applications of Lime Sulfur to Dormant Grapevines

Gadoury, David M.; Pearson, R. C.; Riegel, D.G.; Seem, Robert C.; Becker, C. M.; Pscheidt, Jay William

doi:10.1094/pd-78-0083

Cited by 29 publications

(14 citation statements)

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“…data). The benefit may have been due to a certain fungicidal effect of Ca (Gadoury et al 1994). In Norway, laboratory tests and field observations indicated that low Ca tissue concentration in needles did not contribute to CSNN development (V. T., et al, unpubl.…”

Section: Discussionmentioning

confidence: 99%

Sydowia polyspora associated with current season needle necrosis (CSNN) on true fir (Abies spp.)

et al. 2010

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Section: Discussionmentioning

confidence: 99%

Sydowia polyspora associated with current season needle necrosis (CSNN) on true fir (Abies spp.)

et al. 2010

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“…Th ese results are in line with many previous studies (Gemmrich and Seidel 1996;Halleen and Holz 2001;Hajjeh et al 2008). In contrast, several other studies showed that the ascospores released from the chasmothecia had an important role in the initiation of spring infection (Gadoury et al 1994;Magarey et al 2000;Moyer et al 2008;Taksonyi et al 2010). In New York (Pearson and Gadoury 1987) and some Italian vineyards (Cortesi et al 1997), chasmothecia are the only source of primary inoculum.…”

Section: Chasmothecia Formationmentioning

confidence: 92%

Overwintering form of Erysiphe necator, the causal agent of grapevine powdery mildew in southern Syria

Alimad¹,

Naffaa²,

Azmeh³

2017

Journal of Plant Protection Research

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Th e main aims of this study were to determine the overwintering form and the primary inoculum of Erysiphe necator, the causal agent of grapevine powdery mildew in southern Syria. Eleven vineyards located at fi ve diff erent geographical sites were visited every week from March to November in 2014 and 2015. Th e results of fi eld and histopathological studies showed that E. necator survived as mycelium in dormant grapevine buds during the winter season. Th e fi rst fl ag shoots were observed shortly aft er bud break in spring. Th e number of fl ag shoots varied greatly according to vineyards, cultivars and years, being present on 27.4 to 61.9% of the grapevines in 2014, and on 5.2 to 40% of the grapevines in 2015. Th e percentage of fl ag shoots on the same grapevine also varied according to the year, cultivar and location. It was between 4.3 to 9.4% in 2014, and 2.1 to 3.6% in 2015. Th e disease was observed only on Balady and Black cultivars. Conidia were released from the second week of May to early September. Th e fi rst conidia were trapped around mid-May, and the fi rst secondary symptoms were observed on leaves from mid-May to early June according to the site. Chasmothecia were observed on leaves in 45.5% of the studied vineyards. Th e fi rst observation of chasmothecia on leaves was in July, and their numbers varied greatly between vineyards and years. Chasmothecia were not detected on bark, nor were ascospores trapped at the beginning of the season. Th ese results confi rmed that the ascospores did not have any role in the initiation of spring infection. To the best of our knowledge, this is the fi rst report of the overwintering form of E. necator in Syria.

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“…Application of lime-sulfur or flowable sulfur, prior to budbreak, is often effective in limiting early cleistothecial-based infections (Gadoury et al, 1994).…”

Section: Powdery Mildew (Oidium)mentioning

confidence: 99%

Vineyard Practice

Jackson¹

2014

Wine Science

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Reduction of Powdery Mildew and Other Diseases by Over-the-Trellis Applications of Lime Sulfur to Dormant Grapevines

Cited by 29 publications

References 0 publications

Sydowia polyspora associated with current season needle necrosis (CSNN) on true fir (Abies spp.)

Sydowia polyspora associated with current season needle necrosis (CSNN) on true fir (Abies spp.)

Overwintering form of Erysiphe necator, the causal agent of grapevine powdery mildew in southern Syria

Vineyard Practice

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