Cereal Grasses – Host of Leaf Aphids in Boundary of Biological Field

Abstract

The study was conducted in the spring of 2008 and 2009 in biological field of Institute of agriculture – Karnobat. In cereal crops and boundary around them in the spring, in conditions of organic farming are established to harm four types of leaf aphids – Sitobion avenae, Schizaphis graminum, Rhopalosiphum maidis and Rhopalosiphum padi. The most common type and during the two years of monitoring in cereal crops is Sitobion avenae and boundary alongside them – Schizaphis graminum. In boundary have found five weed species that migrate leaf aphids – Hordeum murinum L., Alopecurus myosuroides L., Bromus arvensis L., Arrhenatherum avenaceum P. B., Lolium temulentum L. Observe the leaf aphids species preference to certain weed species: Schizaphis graminum migrate in Alopecurus myosuroides L., Bromus arvensis L. and Lolium temulentum L. in June. Sitobion avenae is detected in Hordeum murinum L., during the month of June. Rhopalosiphum maidis opened in June when Arrhenatherum avenaceum P. B. and Rhopalosiphum padi occurs Alopecurus myosuroides L. during May and June.