Use of suction-trap and Moericke traps for monitoring the migration of damson-hop aphid (Phorodon humuli) (Hemiptera, Aphididae)

Field catches of Phorodon humuli during 2 years (2000 and 2001) by means of Moericke and suction trap were compared in the province of León (north-west Spain). Positive correlations between the catches with Moericke traps and the catches with the suction trap were found. Positive correlations between the catches with the suction trap and the appearances of the first colonies on crops were also found. These results show that suction trap catches are useful for monitoring the start of spring flight of P. humuli and could serve as a guideline for application of treatments for control of this aphid.