Vuts J.,Rothamsted Research |
Francke W.,University of Hamburg |
Mori K.,Toyo Gosei Co. |
Zarbin P.H.G.,Federal University of Paraná |
And 10 more authors.
European Journal of Organic Chemistry | Year: 2015
Male-specific volatile components, released by the dried bean beetle, Acanthoscelides obtectus, were identified as methyl (E,R)-2,4,5-tetradecatrienoate, methyl (2E,4Z,7Z)-2,4,7-decatrienoate, methyl (2E,4Z)-2,4-decadienoate, octadecanal and the sesquiterpenes (3Z,6E)- and (3E,6E)-α-farnesene. In olfactometer bioassays, pure methyl (E,R)-2,4,5-tetradecatrienoate was only weakly attractive to unmated females. However, a blend of the six identified compounds released in physiologically relevant ratios and doses proved to be as active as headspace odours collected from live males. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Vuts J.,Plant Protection Institute HAS |
Kaydan M.B.,Yuzuncu Yil University |
Yarimbatman A.,Yuzuncu Yil University |
Toth M.,Plant Protection Institute HAS
Physiological Entomology | Year: 2012
Diurnal flower-visiting scarabs (Coleoptera: Scarabaeidae, Cetoniinae) use visual and olfactory stimuli when locating possible feeding sites. In field trapping experiments in Turkey, testing different colours and floral volatile compounds, a combination of fluorescent yellow colour and a blend of 2-phenylethanol and (±)-lavandulol leads to the highest number of Oxythyrea cinctella (Schaum) being caught. Trap catches of O. cinctella with respect to the individually presented visual or olfactory cues are significantly lower than to a combination of the two. The closely-related O. funesta, a sibling species in the Oxythyrea genus, is also known to be caught by the same colour-volatile combination. When applied together in a high capture-capacity trap, the fluorescent yellow colour and the binary floral odour blend may provide a suitable means of monitoring population changes of O. cinctella, which indicates their potential use in agriculture. © 2012 The Authors. Physiological Entomology © 2012 The Royal Entomological Society.
Vuts J.,Plant Protection Institute HAS |
Tolasch T.,University of Hohenheim |
Furlan L.,Viale dellUniversita |
Csonka E.B.,Plant Protection Institute HAS |
And 6 more authors.
Chemoecology | Year: 2012
The presence of geranyl octanoate, previously found in pheromone gland extracts of Agriotes lineatus females, was also demonstrated in gland extracts of A. proximus females. Similar to A. lineatus, geranyl butanoate was present only in trace amounts in A. proximus female gland extracts. In air entrainment samples of female A. lineatus and A. proximus beetles, the relative ratio of geranyl butanoate and geranyl octanoate was higher than that in gland extracts. In addition, comparison of a segment of the mitochondrial cytochrome c oxidase subunit I gene of feral specimens of A. lineatus and A. proximus showed >99% similarity. Both pheromone profile and nucleotide sequence analysis delineate close relationship between the investigated taxa and postulate taxonomic revision. Further studies on sympatric populations of A. lineatus and A. proximus are underway to investigate and better understand possible processes of species diversification. © 2011 Springer Basel AG.
Cserhalmi D.,Szent Istvan University |
Nagy J.,Szent Istvan University |
Neidert D.,Plant Protection Institute HAS |
Kristof D.,Institute of Geodesy
Acta Botanica Hungarica | Year: 2010
The study area is the peaty bed of Nyíres-tó mire which is situated in the northeastern Alföld on the Bereg Plain. For this paper we used a digital photo interpretation method with which we reconstructed the former vegetation from black and white aerial photos, and made chronosequence of vegetation maps. The image segmentation method dissolves the photo into different objects (segments) by spectral and textural parameters. The segments consist of similar pixels, representing a unique ground object. We made the segmentation with the Definiens Inc. eCognition software. The stability of the mire was calculated with GRID-files. The historical vegetation maps show, that after many arid years, the tree or shrub dominant associations increased until the eighties. Later, the sufficient precipitation and the artificial flooding stabilised the tree covering. The analysis of GRID-files shown, that 45.77% of the pixels get code 1 (stable), 44.32% get code 2 (slightly changeable) and only 9.91% get code 3 (changeable). It means that almost half of the mire's vegetation is the same as in 1952. © 2009 Akadémiai Kiadó.