B. Dikova1*, H. Lambev2
1Department of Phytopathology, Plant Protection Division, Institute of Soil Science, Agrotechnologies and Plant protection N. Poushkarov, 7 Shosse Bankya, 1080 Sofia, Bulgaria
2Institute of Roses, Essential and Medical Plants, 49 Osvobozhdenie, 6100 Kazanlak, Bulgaria
Abstract. The objective of the study was the establishment of the seasonal dynamics of some large wide-spread infectious diseases, caused by virus pathogens on the important for Bulgaria essential oil-bearing crop fennel – Foeniculum vulgare (Mill.) that was a prerequisite for determination of dates and means for the control of these pathogens. The researches for the establishment of the viral infection in the fennel plants were carried out by the serological method ELISA (Enzyme linked immunosorbent assay ), variant DAS-ELISA in the former Plant Protection Institute in 2010 and now Division for Plant Protection at the Institute of Soil Science, Agrotechnologies and Plant Protection, Nikola Poushkarov, Sofia, Bulgaria. The observations for the establishment of aphids in fennel crops were carried out at the Institute of Roses, Essential and Medical Plants (IREMC) near Kazanlak, Bulgaria in 2010. Enhancing of the infection, expressed by increasing the viral concentration in the summer in comparison with the spring was established for the following viruses pathological for fennel: Alfalfa mosaic virus (AMV), Cucumber mosaic virus (CMV), Tomato spotted wilt virus (TSWV) and Tobacco mosaic virus (TMV). The number of populations of aphids (carriers – vectors) of AMV and CMV as well as the fennel plants with symptoms of viruses increased in the summer in comparison with the spring. The established dependences will be taken into account in the cases of the integrated management of pests on the fennel. Probably TSWV, transmissible by thripses, and TMV mechanically transmissible, had influence on factors and they were conductive to the increase of the viral concentration in the summer in comparison with the spring.