苏云金芽孢杆菌以色列变种发泡块剂灭白纹伊蚊幼虫的效果研究

Efficacy of Fizzy Tablets of B. t. i against Aedes albopictus Larvae

目的：比较苏云金芽孢杆菌Bti－951发泡块剂（由本所研制）和Bti－Ft发泡块剂（德国提供）灭白纹伊蚊效果。方法：模拟现场试验和现场试验。结果：室内生物测定，Bti－951发泡块剂LD50为0.2365μg／ml；Bti－Ft发泡块剂LD50为0．0903μg／ml。在3．4～3．7m2现场水池中，两种发泡块剂使用剂量为0．5、1．0、1．5g／m2，制剂24小时灭蚊效果均达100％；当剂量为1．5g／m2时，Bti-951发泡块剂持效15天，Bti－Ft可达20天。结论：该剂型运用于小型水体，便于贮存、携带和使用，比乳剂、粉剂持效更长。

Two kinds of fizzy tablets Bti - 951 (local product) and Bti - Ft (from Germany) of Bacillus thuringiensis var israelensis were tested against the larvae of Aedes albopictus in laboratory and field.Laboratory tests showed the LD50 was 0. 2365μg/ml for Bti - 951 fizzy tablet, and 0. 0903μg/ml for the BtiFt fizzy tablet. Three doses of each formulation were used in field trial:0. 5, 1, 1. 5g/m2, 24h after treatment,the reduction rate of larvae of all doses of the two fomulations was 100%. With dose 1. 5g/m2, the persistence of 15 days for Bti - 951 and 20 days for Bti - Ft. The fizzy tablet was easy to store. carry. and use.