Small cereals such us wheat, barley, oat, and other grasses are very much influenced when talking about crop production and various pathogens which can infect them during growth stages. Among these pathogens like downy mildew, tan spot, Septoria disease and other fungi also the viruses contribute to the yield decreasing and loses. Barley Yellows Dwarf Virus is well known as a pathogen strong related to its carrier (vector) being distributed and transmitted by a whole range of aphid species. The aim of this paper is to compare the relationship between aphids and the pathosystem BYDV- barley under certain treatments with different active ingredients used to control the virus vector. To achieve that we assessed the symptoms like leaf discoloration (lose of green colour) turning in bright yellow and trough influence on tillering, linked to the treatments applied and dosage used. The trial setup consists in 7 treatment including untreated laid in four replicates using randomised blocks. Three assessments were performed, to establish the aphid population, followed by assessment of leaves presenting symptoms of viral infection. We observe that, in the variants where a high density of Rhopalosiphum padi was present, the symptom like yellowing was better exerted compared to the plots where other aphid species were observed and build the aphid population.

BYDV, virus vector, Rhopalosiphum padi, symptomes

biology

Presentation: None