| Abstract [eng] |
The research extended knowledge on the sea buckthorn fruit fly, Rhagoletis batava, pest of sea buckthorn (Hippophae rhamnoides L.) berries, trapping peculiarities of the pest as well as to established behavioural effect of natural volatile organic compounds (VOCs). The aim of this study was to reveal R. batava interspecific and intraspecific interactions by VOCs. It was demonstrated that catches of R. batava by traps depended on trap colour, construction and host-plant gender. Parasitoid of the flies, Phygadeuon wiesmanni Sachtleben (Hymenoptera), was recorded as new insect species for fauna of Lithuania. Seasonal dynamics of R. batava adults’ flying period was established in Lithuania. To predict the eclosion of overwintered R. batava adults, the sum of active average daily temperatures for Lithuanian climatic conditions was established. The sea buckthorn berries produce at least 20 VOCs that are olfactory active for R. batava. It was demonstrated that the yeasts which occur on berries, were involved in interaction between R. batava flies and their host-plant. It was found that the emissions of yeasts on the sea buckthorn berries contain 10 VOCs, which are perceived by R. batava adults and evoke behavioural reactions. Sexual dimorphism in R. batava adult behavioural responses to olfactory stimuli was detected. Aggregation pheromone of R. batava species and that for the whole genus Rhagoletis was identified. It will be used to enhance R. batava catches in traps. |
