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Acta Biologica Hungarica
Authors: H. Sytykiewicz, P. Czerniewicz, Iwona Sprawka, Sylwia Goławska, G. Chrzanowski, and B. Leszczyński

Medina-Ortega, K. J., Bosque-Pérez, N. A., Ngumbi, E., Jiménez-Martínez, E. S., Eigenbrode, S. D. (2009) Rhopalosiphum padi (Hemiptera: Aphididae) responses to volatile cues from barley yellow dwarf virus-infected wheat. Environ. Entomol. 38 , 836

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., Welham, S., Nádasy, M., Pickett, J. A., Werner, C. P. (2013) The potential of hydroxamic acids in tetraploid and hexaploid wheat varieties as resistance factors against the bird-cherry oat aphid, Rhopalosiphum padi . Ann. Appl. Biol. 162 , 100

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(in Hungarian) Rabe, E.C., van der Westhuizen, M.C., Hewitt, P.H. 1989., Aspects of the ecology of the wheat aphids Rhopalosiphum padi and Schizaphis graminum in South Africa. Phytophylactica 21, 165

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.] 203 Rabe, E. C., van der Westhuizen, M. C. and Hewitt, P. H. (1989): Aspects of the ecology of the wheat aphids Rhopalosiphum padi and Schizaphis graminum in South Africa

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. 1992 28 69 74 Kuroli, G. 1984. Laboratory investigation of the ontogenesis of oat aphids ( Rhopalosiphum padi L.). Z

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Basky, Z., Hopper, K.R. 2000. Impact of plant density and natural enemy exclosure on abundance of Diuraphis noxia (Kurdjumov) and Rhopalosiphum padi (L.) (Hom., Aphididae) in Hungary. Journal of Applied Entomology 124 :99

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Effects of some dietary o -dihydroxyphenols on biochemical markers of oxidative stress within tissues of Sitobion avenae (Fabricius), (Homoptera, Aphididae) and Rhopalosiphum padi (Linnaeus), (Homoptera, Aphididae) has been studied. Among the studied aphid morphs the highest concentration of total thiols, hydrogen peroxide and lipid peroxidation products (TBARS) was noted for winged adults (alatae). Higher content of H 2 O 2 was observed within tissues of the oligophagous species R. padi while the monophagous species S. avenae had higher TBARS and total thiols concentration. Aphids exposed the dietary pro-oxidative o -dihydroxyphenols (quercetin, caffeic acid, chlorogenic acid) demonstrated significantly lower concentration of total sulfhydryls and higher level of TBARS and H 2 O 2 than the control ones. Among the studied compounds, chlorogenic acid showed the strongest effect on the level of thiols and TBARS while caffeic acid caused the highest accumulation of the hydrogen peroxide within the aphid tissues.

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inoculation access period on the transmission of barley yellow dwarf virus by Rhopalosiphum padi and Sitobion avenae. Annals of Applied Biology 128, 45-53. The effect of temperature and inoculation access period on the

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Yellow dwarf viruses (YDVs) are economically destructive viral diseases of cereal crops, which cause the reduction of harvested yield and quality of grains. Up to now the identification of such viruses was limited to monocotyledonous Poaceae weed hosts, and was not investigated in dicotyledons. In this study, using DAS-ELISA and RT-PCR methods, 6 dicotyledonous weed species, collected from Trakya, Turkey, were examined for the presence of the YDVs pathogens BYDV-PAV, BYDV-MAV, BYDV-RMV, BYDV-SGV and CYDV-RPV. The screening tests revealed certain samples of Geranium dissectum L. and Juncus compressus Jacq. were infected with BYDV-PAV, while other samples of the same species were positive for BYDV-MAV. Additionally, RT-PCR tests of both weed species revealed cases of mixed infection by BYDV-PAV and BYDV-MAV. Transmission experiments using the aphid species Rhopalosiphum padi L. showed that BYDV-PAV was transmitted persistently from Geranium dissectum to barley cv. Barbaros seedlings. To our knowledge, this is the first report of Geranium dissectum and Juncus compressus as possible plant hosts of BYDV-PAV and BYDV-MAV in Turkey.

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In laboratory conditions, the effect of pro-ecological procedures (application of effective microorganisms and Asahi SL biostimulator) and foraging by insects [cereal leaf beetle (Oulema melanopa L.) and bird cherry-oat aphid (Rhopalosiphum padi (L.)] on the total content of phenolic compounds in winter wheat, was studied. Correlations between the total content of phenolic compounds (determined by the Folin-Ciocalteau colorimetric method) expressed as the amount of pyrogallol in wheat plants: undamaged, damaged by O. melanopa, damaged by R. padi, the length of feeding scar left by cereal leaf beetle and the number of pricks made by actively feeding insects of bird cherry-oat aphid were analysed. The wheat was treated by EM inoculant and a biostimulator. The mode of application of the preparations used had a significant effect on level the total phenolic compounds in the undamaged wheat and the wheat exposed to foraging by the above-mentioned insects. The plants not exposed to insects foraging contained greater amounts of phenolic compounds than those exposed to the insects. The correlation between the total content of phenols in the wheat damaged by the insects in the ‘no-choice’ conditions, proved insignificant.

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