Barley Yellow Dwarf Virus in winter cereals

Time: June 5 2015
Place: University of Agricultural Sciences, Alnarp Sweden

The seminar at Alnarp on Barley Yellow Dwarf Virus in winter cereals was arranged with a very short planning period. In Late March and April there were many virus infections in winter cereals in southern Sweden and people from advisory service and farmers had many questions about the reasons for this and the risk for virus infections in winter cereals, the damage and how to avoid such problems. This was discussed at the seminar at SLU, Alnarp on 5th June 2015. The seminar were organised by NJF in collaboration with SLU Partnerskap, Alnarp, Swedish Board of Agriculture (Plant protection Centre at Alnarp) and SLU Uppsala. There were about 50 participants during the seminar. Invited speakers from England, Germany and Denmark beside speakers from Sweden gave a description of BYDV in winter cereals and the main reasons for the problem this year. The warm autumn 2014, more vectors (aphids) than normal and early sowing in autumn 2014 were the main reasons.

Dr Richard Harrington gave a much appreciated presentation on the epidemiology and forecasting of BYDV in winter cereals. The climate change will increase the problems with BYDV in winter wheat, especially when a warm winter will be followed by a wet summer and another warm winter. Such weather conditions will favour such aphids as R. padi. He also informed about the possibility of treatments against the aphids (vectors of BYDV). Virus diseases of cereals was presented by professor Anders Kvarnheden at SLU and the situation of cereal viruses was also presented by Dr Frank RAbenstein, Julius Kuehn Institute (JKI), Quedlinburg, Germany. Danish experience of BYDV in winter cereals was presented by Ghita Cordsen Nielsen, Denmark. She mentioned that BYDV in winter cereals had caused great crop losses in especially winter barley. Several fields had to be re-sown.

Also in Sweden BYDV had caused great problems especially in south-east part of the country. This was described by plant protection specialists Gunilla Berg and Gunnel Andersson. Associate professor Roland Sigvald gave an overview of BYDV in Sweden and the possibility to predict the risk for BYDV in winter wheat using suction traps for insects.

After the seminar participants discussed the problem with BYDV in winter cereals and the possibility to forecast the risk. Preliminary studies on BYDV in winter cereals in Sweden give rather good predictions. Suction trap catches of vectors (aphids), sowing date, calculation of temperature sum and information on occurrence of virus sources should be included in such a risk assessment, but further studies are needed to make a good prediction of BYDV in winter cereals.

Roland Sigvald, SLU, chair of organising committee