Biological Characterization of Uptake, Translocation, and Dissipation of Difenoconazole (CGA 169374) in Wheat, Peanut, and Tomato Plants

Dahmen, Heike

doi:10.1094/pd-76-0523

Cited by 12 publications

(5 citation statements)

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“…Difenoconazole interrupts the synthesis of ergosterol (IUPAC 2016), a fungal cell membrane component. If applied to the vegetation, it has no effect on soil (Dahmen & Staub 1992). Azoxistrobin blocks cell respiration by inhibiting the proenzyme coenzyme Q which prevents the production of ATP.…”

Section: Methodsmentioning

confidence: 99%

Sick plants in grassland communities: a growth‐defense trade‐off is the main driver of fungal pathogen abundance

et al. 2020

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Aboveground fungal pathogens can substantially reduce biomass production in grasslands. However, we lack a mechanistic understanding of the drivers of fungal pathogen infection and impact. Using a grassland global change and biodiversity experiment we show that the trade-off between plant growth and defense is the main determinant of infection incidence. In contrast, nitrogen addition only indirectly increased incidence via shifting plant communities towards faster growing species. Plant diversity did not decrease incidence, likely because spillover of generalist pathogens or dominance of susceptible plants counteracted negative diversity effects. A fungicide treatment increased plant biomass production and high levels of infection incidence were associated with reduced biomass. However, pathogen impact was context dependent and infection incidence reduced biomass more strongly in diverse communities. Our results show that a growth-defense trade-off is the key driver of pathogen incidence, but pathogen impact is determined by several mechanisms and may depend on pathogen community composition.

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Section: Methodsmentioning

confidence: 99%

Sick plants in grassland communities: a growth‐defense trade‐off is the main driver of fungal pathogen abundance

et al. 2020

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“…Sterol demethylation inhibitor (DMI) fungicides occupy the most important position in the world fungicide market. Most of these fungicides, such as difenoconazole,1 hexaconazole,2 triadimefon,3 triarimol4 and triflumizole,5 have a broad spectrum of activity and exhibit systemic properties, penetrating the plant cuticle and subsequently being translocated. Simeconazole, RS ‐2‐(4‐fluorophenyl)‐1‐(1 H ‐1,2,4‐triazol‐1‐yl)‐3‐trimethylsilylpropan‐2‐ol, was developed by Sankyo Agro Co Ltd as a novel DMI fungicide with prominent systemic activity and good crop safety.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the systemic activity of simeconazole in comparison with that of other DMI fungicides

Tsuda¹,

Itoh²,

Kato³

2004

Pest Management Science

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The systemic activity of simeconazole (RS-2-(4-fluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-3-trimethylsilylpropan-2-ol) in plants was compared with those of eight other sterol demethylation inhibitor (DMI) fungicides. Simeconazole prevented the infection of Blumeria graminis (DC) Speer f sp hordei Marchal on barley leaves within a radius of several centimeters from the edge of local treatment on the leaves when the compound was separated from the leaves by glass coverslips. This reveals that simeconazole has prominent vapour-phase activity. Simeconazole showed excellent curative activity against barley powdery mildew when treated 1-3 days after inoculation. Furthermore, this indicates that simeconazole has notable translaminar activity because, when the compound was applied onto either the adaxial or abaxial leaf surface, it showed excellent efficacy against powdery mildew on the opposite side of the leaf surface of barley and cucumber. Simeconazole also showed excellent efficacy against barley powdery mildew by soil drench 24h after inoculation. This suggests that simeconazole was absorbed very quickly into the barley plant after treatment. The permeability of the compound through cuticular membranes prepared from tomato fruits was about 20% at 22 h after the treatment and was much superior to that of the other DMI fungicides tested.

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“…Many sterol demethylation inhibitor (DMI) fungicides have systemic and curative activity 3–7. Among the DMI fungicides, it has been shown that the systemic activity of simeconazole, especially in the permeability through cuticular membranes isolated from tomato fruits and translocation from roots, is outstanding 8.…”

Section: Introductionmentioning

confidence: 99%

Systemic activity of simeconazole and its derivatives in plants

Tsuda¹,

Itoh²,

Kato³

2004

Pest Management Science

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The systemic activity of simeconazole (RS-2-(4-fluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-3-trimethylsilylpropan-2-ol) and a number of its derivatives in plants has been investigated to establish which portion of the structure of the molecule contributes to this outstanding activity. The results revealed that the hydroxyl group of the simeconazole moiety is essential for vapour-phase activity and translocation from roots of the compound. They showed that the presence of a fluorine atom in the structure was not indispensable for vapour-phase activity or translocation from roots, although the fluorine atom contributed to these systemic movements. In addition, it was found that the fungicidal activity of simeconazole against Rhizoctonia solani Kühn and Blumeria graminis DC fsp hordei Marchal is potentiated by the fluorine atom, since the activity of a compound which lacked fluorine in the 4-position of the phenyl ring was inferior to that of simeconazole. A compound in which the silicon atom of simeconazole was replaced by a carbon atom showed lower antifungal activity than simeconazole, while phytotoxicity was caused in rice plants by soil drench of the compound. Therefore, the silicon atom of simeconazole may contribute to its selectivity between fungi and plants.

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Biological Characterization of Uptake, Translocation, and Dissipation of Difenoconazole (CGA 169374) in Wheat, Peanut, and Tomato Plants

Cited by 12 publications

References 0 publications

Sick plants in grassland communities: a growth‐defense trade‐off is the main driver of fungal pathogen abundance

Sick plants in grassland communities: a growth‐defense trade‐off is the main driver of fungal pathogen abundance

Evaluation of the systemic activity of simeconazole in comparison with that of other DMI fungicides

Systemic activity of simeconazole and its derivatives in plants

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