IPS-TYPOGRAPHUS L (COL, SCOLYTIDAE) IN TH E CZECH-REPUBLIC

The Czech Republic is passing the third outbreak-period of Ips typogra phus since 1880. The first and second outbreaks (1870-1876 and 1945-19 54) were a consequence of falling of masses of trees caused by storm. The data of Ips duplicatus during the first outbreak mentioned in late r papers are a mistake, reality it has been Ips amitinus. The third ou tbreak from 1980 until now has not one but several from man dependent and not dependent causes. There are: Falling of trees, by repeating wi ndstorms damage of trees by pollutions of SO2 and their pollutants, th e increasing temperatures during the last period of 30 years and the d evelopment of higher numbers of generations of the beetle. The success es in using pheromones in control of Ips typographus were overestimate d. Also the changes in the ownership of forest stands were of importan ce. Ips duplicatus occured in North Moravia having been migrated acros s Northpoland to the east Czech Republic. In the Nationalpark of Sumav a (on the other side to the Nationalpark of Bavaria) in some reservati ons no measures against Ips typographus as in Bavaria were made. Here new control measures must be taken against this pest.