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Viktor Kerényi-Nagy, Tamás Deák, Géza Kósa and Dénes Bartha

Abstract

Genetic relationships of black-fruit hawthorns of the Carpathian basin have been investigated based on intergenic cpDNA sequences; first of all of the endemic Crataegus nigra and related species. Considerable infraspecific variation was detected in the East Asian taxon C. chlorosarca and some divergence in the Eurasian C. pentagyna. Based on the genetic analysis of investigated and reference psbA-trnH sequences, classification of sections Crataegus and Sanguineae is highly supported. From the studied taxa, C. pentagyna and C. monogyna was ordered to Sectio Crataegus, while C. nigra and .C. chlorosarca to Sectio Sanguineae. Based on our data, C. nigra can be considered as maternal parent of the investigated C. × degenii hybrids.

Open access

Tamás Hochbaum, Marietta Petróczy, Márta Ladányi and Géza Nagy

Abstract

Though profitable crop production can be more simply achieved by using synthetic pesticides, the research of alternative plant protection solutions is necessary. The effect of the volatile oils of cinnamon, thyme, and a copper ingredient fertilizer were tested for their activity against apple scab and powdery mildew in apple orchards in 2014 and 2017. Oils applied alone or in combination were effective against apple scab in 2014 and in 2017 and against powdery mildew on leaves in 2017. The copper ingredient fertilizer product improved the efficacy of the oils. The results of these trials show that the tested volatile oils are suitable candidates for further research and for the development of organic fungicides against the diseases of apple.