Controlling powdery mildew on cucurbit rootstock seedlings in the greenhouse with fungicides and biofungicides

Keinath, Anthony P.; DuBose, Virginia B.

doi:10.1016/j.cropro.2012.06.009

Cited by 32 publications

(18 citation statements)

References 14 publications

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“…Copper hydroxide, if it is applied in 935 liters/ha instead of 467 liters/ha (the volume tested in this study), is safe to use on Emphasis and Strong Tosa, as reported previously (20). Fluopyram -i-tebuconazole caused phytotoxicity on rootstock cultivars in each experiment in which it was tested.…”

Section: Discussionsupporting

confidence: 66%

“…Chlorothalonil (in flowable formulations), strobilurins, and boscalid may not be applied in greenhouses. Phytotoxicity or stunting were observed when tebuconazole and cyprodinil -I-fludioxonil were applied three times to seedlings of L. siceraria 'Emphasis' and hybrid Curcurbita 'Strong Tosa' at 935 liters/ha rates (20). Applications of several newly registered fungicides, including cyprodinil, cyprodinil -(difenoconazole, cyprodinil -i-fludioxonil, difenoconazole, tebuconazole, and tebuconazole -t-fluopyram, are not prohibited in greenhouses.…”

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confidence: 99%

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Susceptibility of Cucurbit Rootstocks to Didymella bryoniae and Control of Gummy Stem Blight on Grafted Watermelon Seedlings with Fungicides

Keinath

2013

Plant Disease

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Section: Discussionsupporting

confidence: 66%

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confidence: 99%

Susceptibility of Cucurbit Rootstocks to Didymella bryoniae and Control of Gummy Stem Blight on Grafted Watermelon Seedlings with Fungicides

Keinath

2013

Plant Disease

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“…Previous studies have shown that application of RS extract on cucumber leaves can significantly reduce PM severity 16,17,37 which was attributed to induction of plant defense mechanisms. Induced resistance has been associated with increased enzymatic activity (of chalcone synthase and isomerase, peroxidases, β−1,3-glucanases) 38 , accumulation of phenolic compounds 15,28,39 , collapse of fungal structures and deposition of dense materials around fungal haustoria 40,41 .…”

Section: Discussionmentioning

confidence: 95%

Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

Margaritopoulou

Toufexi

Kizis

et al. 2020

Sci Rep

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powdery mildew (pM) caused by Podosphaera xanthii is one of the most important courgette diseases with high yield losses and is currently controlled by fungicides and sulphur applications in conventional and organic production. plant derived elicitors/inducers of resistance are natural compounds that induce resistance to pathogen attack and promote a faster and/or more robust activation of plant defense responses. Giant knotweed (Reynoutria sachalinensis, RS) extract is a known elicitor of plant defenses but its mode of action remains elusive. the aim of this study was to investigate the mechanisms of foliar RS applications and how these affect PM severity and crop performance when used alone or in combination with genetic resistance. RS foliar treatments significantly reduced conidial germination and pM severity on both an intermediate resistance (iR) and a susceptible (S) genotype. RS application triggered plant defense responses, which induced the formation of callose papillae, hydrogen peroxide accumulation and the Salicylic acid (SA)-dependent pathway. increased SA production was detected along with increased p-coumaric and caffeic acid concentrations. These findings clearly indicate that RS elicits plant defenses notably as a consequence of SA pathway induction.

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“…have long been studied for use as biocontrol agents, and their control efficacy depends on the live cells or fermentation solutions with live cells applied. The influences of environmental variables, such as temperature, humidity and sunlight, on the reproduction, growth and metabolism of biocontrol microbes are unavoidable, resulting in lower efficiencies of biocontrol agents (Keinath and Dubose 2012). When potential biocontrol microbes that are effective in suppressing pathogens in vitro are further tested for their direct contribution to plant disease control, very few are true biocontrol microbes.…”

Section: Discussionmentioning

confidence: 99%

Lysobacter enzymogenes LE16 autolysates have potential as biocontrol agents— Lysobacter sp. autolysates as biofungicide

et al. 2020

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Aims Biological techniques can manage plant diseases safely and in environmentally friendly ways, but their efficacy needs improvement. It is of the utmost importance to search for powerful microbes for the effective control of plant diseases. Methods and Results Unheated self‐digestive solutions (SDS) that were heated at 100°C for 30 min(H‐SDS) or stored for 12 months at room temperature (S‐SDS) were prepared from Lysobacter enzymogenes LE16 broth culture to study their potential as biocontrol agents. This bacterium produced protease, phosphatase, lysozyme and siderophores in pure culture as well as 12 secondary metabolites including novel antibiotics lysobactin, WAP‐8294A2 and mupirocin determined based on the antiSMASH 5.0.0 blast database. A poison plate assay revealed the antagonistic activities of SDS, H‐SDS and S‐SDS against an animal pathogenic bacterium Staphylococcus aureus, a phytopathogenic bacterium Pseudomonas syringae pv. tabaci, and numerous plant pathogenic fungi and oomycetes, including Colletotrichum gloeosporioides, Penicillium italicum, Alternaria alternate, Rhizoctonia solani, Didymella bryoniae, Sclerotinia sclerotiorum, Phytophthora nicotianae and Phytophthora capsici. The greenhouse experiment showed that SDS was highly effective in controlling pepper blight disease, which is caused by P. capsici. Compared with only pathogen inoculation, the application of SDS to the soil in preventive or curative treatments significantly reduced the disease incidence and index with relatively high control efficacy of 86·2–93·1%. Conclusions SDS enriched lytic enzymes, siderophores and antibiotics, has a wide antimicrobial spectrum, and shows potential as a new, safe and effective biocontrol agent against plant diseases. Significance and Impact of the Study Autolysates of the new biocontrol bacterium L. enzymogenes LE16 demonstrated the potential for industrial production and commercial use as a promising biocontrol agent in agriculture.

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Controlling powdery mildew on cucurbit rootstock seedlings in the greenhouse with fungicides and biofungicides

Cited by 32 publications

References 14 publications

Susceptibility of Cucurbit Rootstocks to Didymella bryoniae and Control of Gummy Stem Blight on Grafted Watermelon Seedlings with Fungicides

Susceptibility of Cucurbit Rootstocks to Didymella bryoniae and Control of Gummy Stem Blight on Grafted Watermelon Seedlings with Fungicides

Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

Lysobacter enzymogenes LE16 autolysates have potential as biocontrol agents— Lysobacter sp. autolysates as biofungicide

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