Physical Modes of Action of Petroleum and Plant Oils on Powdery and Downy Mildews of Grapevines

Northover, John; Schneider, Karin E.

doi:10.1094/pd-80-0544

Cited by 55 publications

(24 citation statements)

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“…Mycoparasites applied without mineral oil proved to be ineffective compared with the treatments with the mineral oil ADDIT. These results and the fact that oil itself provided reasonable disease reduction agree with the suggestion that mineral oil not only keeps the leaf surface wet longer, thus providing a microclimate optimal for mycoparasites, but also exerts a direct deleterious effect upon P. fusca conidia, probably by inducing alterations in the membrane that could collapse the spore, causing it to become unviable (Northover & Scheider, 1996; McGrath & Shishkoff, 1999; Fernández et al ., 2006).…”

Section: Discussionsupporting

confidence: 90%

Evaluation of biological control agents for managing cucurbit powdery mildew on greenhouse‐grown melon

et al. 2007

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An evaluation was made of the ability of two mycoparasite-based products AQ10® ( Ampelomyces quisqualis ) and Mycotal® ( Lecanicillium lecanii ), as well as three strains of Bacillus subtilis , to manage powdery mildew disease, caused by Podosphaera fusca on melon seedlings maintained under different regimes of relative humidity and on plants grown under greenhouse conditions in Spain. In every case fungal and bacterial biocontrol agents (BCAs) performed better under conditions of high relative humidity (90-95% RH). In greenhouse experiments, the effectiveness of the mycoparasites to manage powdery mildew was absolutely dependent on mineral oil. The strains of B. subtilis provided disease control similar to that achieved with the mycoparasites or the fungicide azoxystrobin. Microscopic analysis showed the ability of these bacterial strains to efficiently colonize leaf surfaces and revealed the occurrence of antagonistic interactions between biological agents and P. fusca structures. These results confirmed the usefulness of these BCAs for managing powdery mildew on greenhouse-grown cucurbits either as single products or as a component of integrated control programmes.

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Section: Discussionsupporting

confidence: 90%

Evaluation of biological control agents for managing cucurbit powdery mildew on greenhouse‐grown melon

et al. 2007

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“…Both B. napus and G. max oil have been found effective for control of powdery mildew ( Microsphaera sp.) (Northover and Schneider ; Pasini et al. ).…”

Section: Discussionmentioning

confidence: 99%

Green peach aphid [Myzus persicae (Sulzer) (Hemiptera: Aphididae)] control using Brassicaceae ethyl ester oil sprays

Hansson

Morra

Borek

et al. 2012

J Applied Entomology

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Control of green peach aphid (Myzus persicae), a globally important pest, using plant‐derived oils is a promising alternative to conventional insecticides. Although various plant‐derived oils are potentially useful for insect control, dose–response studies and efficacy comparisons among oils have not been widely reported. Our objective was to compare M. persicae control by plant‐derived oils, focusing on oils derived from Brassicaceae species that exhibit rotational and environmental quality benefits. We thus applied sprays of emulsified ethyl esters from the seed oils of yellow mustard (Sinapis alba), oriental mustard (Brassica juncea) and rapeseed (Brassica napus) to M. persicae in a laboratory bioassay. A dose–response relationship was modelled for the S. alba spray yielding LD50/LD95 values of 18.2 ± 0.87/128.1 ± 5.10 μg ester per cm2 (P < 0.0001). Ethyl esters of oils from all three species and soybean (Glycine max) ethyl ester were compared to determine the efficacy of Brassicaceae oils relative to the dominant plant‐oil spray currently available. All ethyl esters were equally efficacious despite measured differences in fatty acid profiles among the oils. Oils derived from mustards B. juncea and S. alba are potentially useful feedstocks for the production of insecticidal sprays, and testing on additional insects is warranted.

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“…Grape powdery mildew, caused by Uncinula necator , is an important disease that can be seen nearly everywhere in the world where grape farming is practised. The disease is very difficult to control and may cause important yield and quality losses if not controlled sufficiently (Pearson and Goheen, 1988; Ellis, 1994; Gubler and Ypema, 1996, Northover and Schneider, 1996). Sulphur and synthetic fungicides have been the traditional option of control.…”

Section: Introductionmentioning

confidence: 99%

“…Plant oils (Northover and Schneider, 1996), sodium hydrogen carbonate (Reh and Schlosser, 1995) and silicates (Reh and Schlosser, 1994; Reynolds et al, 1996) are the substances that have mostly been explored to develop alternative plant protection material against powdery mildew. The objective of this study was to investigate and evaluate the effectiveness of Na 2 SiO 3 , K 2 SiO 3 , KH 2 PO 4 , NaHCO 3 and di‐1‐ p ‐menthen as alternatives to synthetic fungicides in Izmir and Manisa, Turkey.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Efficacy of some Natural Chemicals against Powdery Mildew [Uncinula necator (Schw.) Burr.] of Grape

Yıldırım¹,

Onoğur²,

Irshad³

2002

Journal of Phytopathology

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The efficacies of Na2SiO3, K2SiO3, KH2PO4, NaHCO3 and di‐1‐p‐menthen against powdery mildew caused by Uncinula necator (Schw.) Burr. were investigated on Vitis vinifera L. spp. c.v. ‘Yuvarlak Cekirdeksiz’ and compared with the efficacy of sulphur and penconazole. The investigation was carried out during 1998–1999 under glasshouse condition and in two vineyards in Manisa and Izmir/Turkey. When applied to pot‐grown plants before inoculation with the fungus, NaHCO3 and Na2SiO3 reduced the spore formation ability of colonies for 4 days on young leaves and NaHCO3, KH2PO4, Na2SiO3 and di‐1‐p‐menthen reduced the spore formation ability of colonies for 7 days on old leaves. In vineyard trials, all the test chemicals showed low efficacies against leaf infection. However, bunch infections were inhibited by fungicide application with the alternation of KH2PO4– di‐1‐p‐menthen and the mixture of KH2PO4 + sulphur(S) (WP), as effectively as by the alternate application of penconazole – sulphur. NaHCO3 and K2SiO3 + S (WP) were less effective in the vineyard with high disease incidence. The test chemicals had no effect on the sugar content of berries and did not cause any toxic effect or residue problems in the leaves and bunch. It is, therefore, suggested that Na2SiO3, K2SiO3, KH2PO4, NaHCO3 and di‐1‐p‐menthen could be included in the spraying programmes against powdery mildew with sulphur, synthetic fungicides or they could be used in suitable mixtures and alternations with each other.

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Physical Modes of Action of Petroleum and Plant Oils on Powdery and Downy Mildews of Grapevines

Cited by 55 publications

References 0 publications

Evaluation of biological control agents for managing cucurbit powdery mildew on greenhouse‐grown melon

Evaluation of biological control agents for managing cucurbit powdery mildew on greenhouse‐grown melon

Green peach aphid [Myzus persicae (Sulzer) (Hemiptera: Aphididae)] control using Brassicaceae ethyl ester oil sprays

Investigations on the Efficacy of some Natural Chemicals against Powdery Mildew [Uncinula necator (Schw.) Burr.] of Grape

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