In this study, prevalence, distribution and seasonal dynamics of Howardula phyllotreae Oldham, parasitic nematode of two flea beetles, Phyllotreta undulate and p. atra in Middle and East Blacksea Region of Turkey were investigated. Nematode infection was observed in all localities investigated during the study. The infection was always found higher in P. undulata population than that in P. atra population. Maximum infections for both insects were recorded in April. This study confirms that H. phyllotretae is a wide spread parasite.