SUMMARY 



Studying daily and seasonal activity of potato beetle we tried to find out how many 

 per cent of beetles are to be found by means of the field examination actions and when 

 and under which conditions beetles can be found. Further aim of ours was to find out 

 the bases for the economical evaluation of present methods of control. This was done by 

 means of investigation on nutrition of beetles and larvae. We tried to provide the data 

 for a new method of estimation of pest infesting of potato stands. Besides field investi- 

 gation on the influence of temperatiu-e on the activity of potato beetles and their larvae 

 laboratory experiments were carried on. The influence of sunshine, air humidity, Avind, 

 barometric pressure and rainfall was examined in filed experiments only. 



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