The aim of this study was to compare the effect of PE black mulch with bare soil and hay cover against winged aphid number. In order to create management strategy in watermelon, flight dynamics of aphid population was recorded. The field experiment was set up as a randomized block design in three replications at Pula in Mediterranean region of Croatia. Aphids were collected weekly using yellow water metal traps. There were six sampling dates starting from 19 May until mulch was covered by plant canopy. We found significant difference in aphid number among the sampling dates as a result of their population dynamics on watermelon. The catches of two assessments in the second half of May were more numerous than during assessments in June. The flight maximum was recorded on 26 May and the population density significantly decreased from 9 June. There was not much effect of mulch on aphid number. However, at the peak of aphid population hay cover attracted 13% (26 May) and 18% (2 June) more aphids compared to bare soil. . maja do trenutka, ko so listi lubenic prekrili tla, smo opravili šest preštevanj. Med posameznimi datumi smo ugotovili značilno razliko med številom uši na vabah, ki je bila posledica njihove populacijske dinamike na rastlinah. Število uši v dveh preštevanjih v drugi polovici maja je bilo znato večje od števila uši naštetih v juniju. Največji nalet uši je bil ugotovljen 26. maja. Njihova razširjenost pa se je značilno zmanjšala do 9. junija. Način zastiranja tal ni statistično značilno vplival na razširjenost uši. Poudariti pa je treba, da je na vrhuncu prisotnosti uši senena zastirka privabila 13 % (26. maja) oz. 18 % (2. junija) več uši, kot smo jih našteli v obravnavanjih na golih tleh.