Oriental hornet  Vespa orientalis L.,causes a great damage to apiaries , where it attacks larvae and adult of the bees also it attacks the honey , Our research carried out in apiary of faculty of agriculture Al-Azhar university at Mosturod location, Kalubia governorate during  2002 and 2006  seasons, The population dynamic of this pest was studied by using sticky traps and the effect of the coloured sticky traps on the wasps catching number. Oriental wasps appear in the first week of April and decreased gradually to the minimum levels during June and July. Then the activity of wasps increased gradually from the second week of August to the fourth week of September. The maximum Total numbers of wasps recorded in October, September and November, after that these numbers decreased gradually at the first week of December.  The pink sticky traps proved to be the most, attractive method followed by orange and the white ones. On the other hand, black color proved to be the least one. The mean numbers of captured hornets by these sticky traps were 43.33, 30.66, 17.33, 11.66 wasps/ trap/ day respectively. Opposite trend was recorded for the mean numbers of captured honey bees by these coloured sticky traps