O. KARADJOVA1, D. HRISTOVA1 and G. ADAM2
1 Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria
2 University of Hamburg, Germany
KARADJOVA, O., D. HRISTOVA and G. ADAM, 2001. Effect of imidacloprid on the tobacco aphid (Myzus nicotianae Blackman) and the peach aphid (Myzus persicae Sulz.) – vectors of virus diseases. Bulg. J. Agric. Sci., 7: 261-270
Cucumber mosaic virus (CMV) and Potato virus Y (PVY) are economically important plant viruses causing diseases of many vegetables and field crops in Bulgaria. Both viruses are non-persistently transmitted by aphids. The green peach-potato aphid – Myzus persicae Sulz. and the tobacco aphid Myzus nicotianae Blackman are among the most important vectors of CMV and PVY. The transmission efficiency of CMV U° and PVYn by M. nicotianae and M. persicae was investigated. The results from ACP-ELISA and DAS-ELISA showed that M. nicotianae transmit CMV U° and PVYn more efficiently than M. persicae. Average CMV transmission rate for M. nicotianae was 77.9% ± 11.07, whereas this of M. persicae was 57.36% ± 8.06. The tobacco aphid transmitted PVYn almost two times more efficiently than the green peach aphid (75.82% versus 44.21%). It was also investigated the virus incidence after treatment with imidacloprid and acetamiprid under field and laboratory conditions. Imidacloprid is more effective against M. nicotianae and M. persicae than acetamiprid. Both tested insecticides could not prevent the virus infection in the tobacco field and to kill viruliferous aphids before they induce damage The laboratory test revealed that M. nicotianae was less susceptible to the tested insecticides than M. persicae.