Send to

Choose Destination
See comment in PubMed Commons below
J Am Mosq Control Assoc. 1992 Sep;8(3):285-9.

Factors influencing the activity of Bacillus thuringiensis var. israelensis treatments.

Author information

German Mosquito Control Association (KABS), Ludwigshafen, Germany.


Environmental factors influence the effectiveness of microbial control agents in mosquito control programs. Four of these factors (water temperature, larval density, sunlight and the effect of associated filter feeders) were studied with Bacillus thuringiensis var. israelensis under laboratory and semifield conditions in Europe using different instars of Aedes vexans, Ae. aegypti and Culex pipiens. Bioassays conducted at a low temperature (5 degrees C) yielded 10-fold higher LC50 and LC90 values compared with those conducted at a high temperature (25 degrees C). The efficacy of B.t.i. decreased in a linear manner with increasing larval density. Sunlight can reduce the effectiveness of B.t.i. by several times. Competition in food intake by filter feeding Daphnia resulted in lower mortality of mosquito larvae after B.t.i. applications.

[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Loading ...
    Support Center