This paper presents a comprehensive list of American Epicauta. Two hundred and sixty-four named species were recorded in this checklist based primarily on literature and museum records. Seventy-two species were included in the subgenus Macrobasis and 192 species into the nominotypic subgenus. Nomenclatural modifications are provided for E.langei Borchmann and E.nigripes Borchmann, both junior synonyms of E.pilme (Molina); E.albicincta Borchmann, junior synonym of E.suturalis (Haag-Rutenberg); E.lugubris Denier, junior synonym of E.tristis (Mäklin); and E.wagneri Pict, junior synonym of E.vicina (Haag-Rutenberg). Three hundred and ninety-two new records for South America are provided.

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An antifungal activity-directed fractionation of leaf constituents from Schinopsis balansae on Fusarium graminearum yielded a fraction mainly made of a mixture of four 3-n-heptadec(en)ylcatechols (PALK). The PALK fraction showed on macroconidia germination a MIC value of 500 μg/mL which was twofold higher than that required for prothioconazole (MIC = 250 μg/mL). Sublethal concentrations of PALK modify the morphogenesis in germinating macroconidia, and decreased fungal production of HO and deoxynivalenol biosynthesis at early fungal growth. Mixes of PALK and prothioconazole showed a synergic interaction. Our findings suggest that PALK constituents might restrict the adherence of F. graminearum to the surface of its hosts and its virulence on susceptible cereals. They deserve further research as additives of azole fungicides against F. graminearum.

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Septoria brown spot and Cercospora leaf blight are late season diseases caused by Septoria glycines and Cercospora kikuchii, respectively. New antifungals are required against these diseases because the chemical controls currently used have detrimental impacts on wildlife and human health. In this work, 48 extracts originated from the leaves, bark, sapwood or heartwood of four forestry species were assayed by the disc diffusion method against S. glycines and C. kikuchii.Although 18 extracts showed antifungal activity, only 5 were active on both fungal species. The leaf methanolic extract of Blepharocalyx salicifolius showed the lowest minimum inhibitory dose (MID) and the highest diameter of growth inhibition (DI) on both fungal species (MID = 200 μg, DI = 14.2 mm, C. kikuchii; MID = 400 μg, DI = 12.2 mm, S. glycines). Pinocembrin was identified as the main antifungal constituent of the methanolic extract. Both the methanolic leaf extract of B. salicifolius and pinocembrin synergized in vitro the effect of the fungicide difenoconazole.Preventive applications of the extract and the mixture extract + difenoconazole (2.4 mg/mL + 0.006 mg/mL) strongly reduced disease severity generated by S. glycines and C. kikuchii 21 days after inoculation of the soybean plants. This effect was significantly stronger than that generated by difenoconazole. Our results suggest that the application of the methanolic extract of B. salicifolius, alone or in mixture with difenoconazole is a promising strategy to be incorporated in the chemical control of S. glycines and C. kikuchii.