Mosquito pupae usually take nine days to develop so the ovitraps are retrieved after seven days . mr . lam said , ovitraps are placed at black spots where aedes pupae or pupae of other mosquitoes have been found 蚊蛹孵化期一般是九天，所以大学安全及环境事务处的同事会在七天内收回诱蚊产卵器，避免蚊蛹孵化成蚊。
In response to the high ovitrap indices detected in april , the second phase of the campaign was advanced from 15 july to 28 may 2002 and the duration was extended from four weeks to six weeks 同年四月，诱蚊产卵器指数偏高，第二期灭蚊运动遂由七月十五日提前至五月二十八日开始，并由原定的四个星期延长为六个星期。
Fehd will continue to inspect all building construction sites once weekly and strengthen anti - mosquito measures in public places ( not already covered by another department ) commensurate with the ovitrap indices 食环署会继续每周巡查各建筑地盘，并按照诱蚊产卵器指数加强公众地方（未有其他部门跟进的）灭蚊措施。
In response to the high ovitrap indices detected in april , the second phase of the campaign was advanced from 15 july to 28 may 2002 and the duration was extended from four weeks to six weeks 同年四月，诱蚊产卵器指数偏高，第二期灭蚊运动遂由七月十五日提前至五月二十八日开始，并由原定的四个星期延长为六个星期。
Mr . lam shi - kai , safety manager of the office , said , we place ovitraps at 15 different locations on campus , for seven days at a stretch . we then tally the number of pupae and change locations monthly 该处安全事务经理林树佳先生说：我们在校园十五个不同地点放置诱蚊产卵器，每次摆放七天，然后统计蚊蛹数目，每月则会更换放置地点。
The ovitraps are provided by the department of food and environmental hygiene . they are black cylinders of 200 ml each and come with a brown paddle . the paddle is dipped in water to lure female mosquitoes to lay eggs 大学的诱蚊产卵器均由食物环境卫生署提供，是一个约二百毫升的细小黑色容器，内有水和一褐色产卵棒，吸引雌蚊产卵。
The ' shape of basal tegmen , basal piece of lateral lobe with crack in base , lateral margins of basal piece of lateral lobe , the ratio of width of lateral lobe and width of apex of basal piece , shap 本文分析讨论了雌性产卵器各部分的结构特点在伪叶甲亚科分类中的意义，如肛侧板是否分片、肛侧板背面部分是否延长、基腹片基部大片的分节
In this connection , fehd would pilot an ovitrap study covering upper floors of high - rise buildings in mid 2003 . the findings of this pilot study will shed light on how best to prevent mosquito bites inside homes 在这方面，食环署将于本年中在一些大厦的高层单位内进行诱蚊产卵器试验研究，该研究可就如何预防在家居环境被蚊叮，提供重要参考资料。
12 july to 21 august old tenement buildings and other problem areas are targeted in a follow up to the second phase of the anti - mosquito campaign and to address high ovitrap indices recorded in the rainy season 2004年第二期灭蚊运动结束后，为保持灭蚊工作的成效及针对在雨季期间录得偏高的诱蚊产卵器指数，本署加强在全港旧唐楼和蚊患黑点的防蚊工作。
Indeed , the anti - mosquito campaign was so effective that the average ovitrap index of 3 . 8 per cent recorded during the year was the lowest since the dengue fever vector surveillance programme was launched in 2000 本署推行的灭蚊运动相当有成效，年内录得的平均诱蚊产卵器指数为3 . 8 % ，是自二零零零年推行登革热病媒监察计划以来所录得最低的全年平均记录。
