Synergistic and antagonistic interactions of fungicides against Pythium aphanidermatum on perennial ryegrass

Couch, Houston B.; Smith, Brian D.

doi:10.1016/s0261-2194(06)80029-3

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…When the stabilized LPO formulation was combined with five commercial fungicides, the effects ranged from synergistic to antagonistic and were dependent on the pathogen X fungicide X concentration combination. This is in agreement with previous studies, which found that synergistic enhancement of fungicidal activity is dependent on the sensitivities of the target species, or strains within a species, to each individual component of the mixture [9]. For example, Samoucha and Cohen (1986) found that a mixture of the systemic fungicide metalaxyl and any of five different contact fungicides resulted in the synergistically enhanced control of potato late blight caused by either a metalaxyl-sensitive or metalaxyl-resistant isolate of Phytophthora infestans [32].…”

Section: Discussionsupporting

confidence: 92%

“…The effects of fungicide combined with stabilized enzyme formulation were characterized as synergistic, additive, or antagonistic based on the methods described by Couch et al [9]. Briefly, an additive effect is observed when the level of disease control imparted by the co-operative action of two or more fungicides is equal to the control, as predicted by the response of each fungicide applied by itself.…”

Section: Statistical Analysis and Determination Of Synergism Additivmentioning

confidence: 99%

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In-Vitro Inhibition of Pythium ultimum, Fusarium graminearum, and Rhizoctonia solani by a Stabilized Lactoperoxidase System alone and in Combination with Synthetic Fungicides

2017

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Advances in enzyme stabilization and immobilization make the use of enzymes for industrial applications increasingly feasible. The lactoperoxidase (LPO) system is a naturally occurring enzyme system with known antimicrobial activity. Stabilized LPO and glucose oxidase (GOx) enzymes were combined with glucose, potassium iodide, and ammonium thiocyanate to create an anti-fungal formulation, which inhibited in-vitro growth of the plant pathogenic oomycete Pythium ultimum, and the plant pathogenic fungi Fusarium graminearum and Rhizoctonia solani. Pythium ultimum was more sensitive than F. graminearum and R. solani, and was killed at LPO and GOx concentrations of 20 nM and 26 nM, respectively. Rhizoctonia solani and F. graminearum were 70% to 80% inhibited by LPO and GOx concentrations of 242 nM and 315 nM, respectively. The enzyme system was tested for compatibility with five commercial fungicides as co-treatments. The majority of enzyme + fungicide co-treatments resulted in additive activity. Synergism ranging from 7% to 36% above the expected additive activity was observed when P. ultimum was exposed to the enzyme system combined with Daconil ® (active ingredient (AI): chlorothalonil 29.6%, GardenTech, Lexington, KY, USA), tea tree oil, and mancozeb at select fungicide concentrations. Antagonism was observed when the enzyme system was combined with Tilt ® (AI: propiconazole 41.8%, Syngenta, Basel, Switzerland) at one fungicide concentration, resulting in activity 24% below the expected additive activity at that concentration.

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Section: Discussionsupporting

confidence: 92%

Section: Statistical Analysis and Determination Of Synergism Additivmentioning

confidence: 99%

In-Vitro Inhibition of Pythium ultimum, Fusarium graminearum, and Rhizoctonia solani by a Stabilized Lactoperoxidase System alone and in Combination with Synthetic Fungicides

2017

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“…For a long time, fungicide application with different mode-of-action fungicides is generally accepted to enhance disease protections synergistically, as well as to escape occurrence of fungicide-resistance isolates in nature (Gisi, 1996). Fungicide synergism was well demonstrated during the control of oomycete pathogen-causing plant diseases, Pythium aphanidermatum on perennial ryegrass (Couch and Smith, 1991), Pseudoperonospora cubensis on cucumber (Samouch and Cohen, 1988), Plasmopara viticola on grapevine (Gisi et al, 1985) and Phytophthora infestans on tomato (Gisi et al, 1985). Recently, fungicide synergism was reassessed for control of turfgrass dollar spot caused by Sclerotinia homeocarpa (Burpee and Latin, 2008).…”

Section: Discussionmentioning

confidence: 99%

Chemical and Biological Controls of Balloon Flower Stem Rots Caused by Rhizoctonia solani and Sclerotinia sclerotiorum

Lee¹,

Cho²,

Lee³

et al. 2012

The Plant Pathology Journal

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Stem rots caused by Rhizoctonia solani and Sclerotinia sclerotiorum have been known as devastating diseases in balloon flower plants. Antifungal activities of four fungicides, azoxystrobin, polyoxin B, trifloxystrobin and validamycin A were evaluated in vitro, showing effective suppression with mycelial growth of the fungal isolates on PDA media. Efficacies of the four fungicides were also demonstrated in stem tissues of balloon flower plants against R. solani and S. sclerotiorum. A commercially available Bacillus subtilis strain Y1336 was tested in terms of antagonistic biological control of stem rot disease of balloon flower plants. The bacterial strain revealed its antifungal activities against R. solani and S. sclerotiorum demonstrated by dual culture tests using paper discs and two plant pathogenic fungi on PDA media, as well as by plant inoculation assay, indicating that this antagonistic bacterial strain can be incorporated into disease management program for balloon flower stem rot diseases together with the four chemical fungicides.

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“…이에 대한 대안으로 작용기작이 다른 농약의 혼용은 살 포약량의 감소, 복수의 병 동시방제나 상승작용에 따른 약 효 제고를 목적으로 실시되어 왔다 (Couch and Smith, 1991;Gisi, 1996). 이때 보통 작용기작(mode of action)이 다른 2~3종의 약제가 혼용되며 약효의 상승은 조합에 따라 다 르게 나타난다 (De Ward, 1996;Gisi, 1996;Kosman & Cohen, 1996;Burpee & Latin, 2008).…”

Section: 우리나라 골프장에서 동전마름병 발생은 봄부터 시작하 여 조건이 양호할 경우 늦은 가을까지 지속된다 발병에 unclassified

Control Effect on Dollar Spot Disease Caused by Sclerotinia homoeocarpa under Different Application Rates and Intervals with Two Mixed Fungicides

Chang¹,

Jung²,

Kim³

et al. 2013

Weed & Turfgrass Science

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ABSTRACT. Dollar spot caused by Sclerotinia homoeocarpa F.T. Benn. is a common and economically important turfgrass disease in South Korea. Fungicides mixture (propiconazole 25% + boscalid 47%) treatments, showing synergistic interaction, with three application rates (low: 50.3 ml 10a -1 and 97.5 g 10a , and high: 100.5 ml 10a -1 and 195.0 g 10a) and two application intervals (10 and 15 days) were evaluated for control of dollar spot in creeping bentgrass golf course putting green. In both nontreated plots of field A and B, the disease has severed as 48.3 and 60.0% after the pathogen inoculation. Two fungicide mixture treatments showed significantly higher the disease control effect than a single fungicide treatment (propiconazole). Field A which showed more the disease severity but the fungicide still showed acceptable level of the disease efficacy (89.0%), significant differences in control value were not detected among treatments. The results suggest that the lower application rate of two fungicides mixture treatments may reduce the dollar spot disease severity in creeping bentgrass golf course putting green.

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Synergistic and antagonistic interactions of fungicides against Pythium aphanidermatum on perennial ryegrass

Cited by 13 publications

References 11 publications

In-Vitro Inhibition of Pythium ultimum, Fusarium graminearum, and Rhizoctonia solani by a Stabilized Lactoperoxidase System alone and in Combination with Synthetic Fungicides

In-Vitro Inhibition of Pythium ultimum, Fusarium graminearum, and Rhizoctonia solani by a Stabilized Lactoperoxidase System alone and in Combination with Synthetic Fungicides

Chemical and Biological Controls of Balloon Flower Stem Rots Caused by Rhizoctonia solani and Sclerotinia sclerotiorum

Control Effect on Dollar Spot Disease Caused by Sclerotinia homoeocarpa under Different Application Rates and Intervals with Two Mixed Fungicides

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