Toma Luciano, Severini Francesco, Bella Antonino, Romi Roberto
Istituto Superiore di Sanità, Laboratorio di Parassitologia, Rome, Italy.
J Am Mosq Control Assoc. 2003 Dec;19(4):424-9.
We evaluated the effectiveness and duration of effectiveness of a new formulation of Bacillus thuringiensis var. israelensis (Bti) for control of larval Aedes albopictus. The product tested was Vectobac DT (ABG-6499), a Bti tablet formulation containing 3.4% of active ingredient (3,400 ITU/mg) supplied by SCAE Valent BioSciences Italy S.r.l. The study was conducted at the Botanical Garden of the University of Rome "La Sapienza" between June and September 2002, the most favorable season for the development of Ae. albopictus in Italy. Black 20-liter plastic buckets containing water and an organic substrate were used as experimental breeding sites. The number of larvae in these buckets was estimated weekly, and positive buckets were treated with the recommended dose of the larvicide. The results showed that Vectobac DT induced 100% larval mortality after 24 h in all experimental breeding sites during the entire study period. Nonetheless, in most cases, the larvicidal activity only lasted about 48 h; thus, effective mosquito control would require that treatment be performed every 8-10 days in this habitat.
我们评估了一种新型以色列亚种苏云金芽孢杆菌（Bti）制剂对白纹伊蚊幼虫的防治效果及有效期。所测试的产品是Vectobac DT（ABG - 6499），这是一种Bti片剂制剂，由意大利SCAE Valent BioSciences Italy S.r.l.提供，活性成分含量为3.4%（3400国际毒力单位/毫克）。该研究于2002年6月至9月在罗马“La Sapienza”大学植物园进行，这是意大利白纹伊蚊生长最适宜的季节。装有水和有机基质的20升黑色塑料桶被用作实验性滋生地。每周估计这些桶中幼虫的数量，对有幼虫的桶按推荐剂量施用杀幼虫剂。结果表明，在整个研究期间，Vectobac DT在所有实验性滋生地24小时后均导致100%的幼虫死亡率。然而，在大多数情况下，杀幼虫活性仅持续约48小时；因此，要在该栖息地有效控制蚊虫，需要每8 - 10天进行一次处理。
