Wasp Neodryinus typhlocybae Ashmead – successful predator and parasitoid for reducing the population of flatid planthopper (Metcalfa pruinosa Say) also in Slovenia | Osica Neodryinus typhlocybae Ashmead – tudi v Sloveniji uspešen predator in parazitoid pri omejevanju populacije medečega škržata (Metcalfa pruinosa Say)

anglais. Metcalfa pruinosa Say has been present in Slovenia for more than a decade and has been gradually, but constantly spreading also because of the reason that for the time being we do not have an efficient autochthonous natural enemy that could limit such great population in number and its spreading to the central parts of the country. The wasp Neodryinus typhlocybae Ashmead is in the North and South America and after its introduction to Italy also in Europe the main antagonistic organism for the limitation of spreading of flatid planthopper. With the introduction of the wasp to Slovenia we have wanted to limit the spreading of flatid planthopper, to reduce the population and so to establish a partly biological balance between these two species. In the research we were observing time adjustment between the hatching of the wasp and the appearance of different evolutionary stages regarding flatid planthopper and the appearance of the second incomplete generation of the wasp which is important for predatory and parasitoid effect. We were also doing research into successful settlement of the wasp into a natural habitat on two locations in the Primorska region.

slovène. Medeči škržat (Metcalfa pruinosa Say) je v Sloveniji navzoč že več kot desetletje in se počasi, a vztrajno širi tudi zato, ker tu zaenkrat še ni učinkovitega avtohtonega naravnega sovražnika, ki bi lahko omejeval številčno velike populacije in širjenje medečega škržata v notranjost države. Osica Neodryinus typhlocybae Ashmead je na območju obeh Amerik ena izmed glavnih, od njenega vnosa v Italijo, pa tudi v Evropi glavni antagonistični organizem za omejevanje širjenja medečega škržata. Z vnosom osice v Slovenijo smo želeli omejiti širjenje medečega škržata, znižati številčnost populacij in tako vzpostaviti delno biološko ravnotežje med tema vrstama. V raziskavi smo ugotavljali časovno usklajenost izleganja osice s pojavljanjem različnih razvojnih stadijev medečega škržata in pojavljanje druge nepopolne generacije osice, ki je pomembna za zagotavljanje uspešnega predatorskega in parazitoidnega učinka. Ugotavljali smo tudi uspešnost naselitve osice v naravno okolje na dveh lokacijah na Primorskem.