Bacillus thuringiensis subsp. israelensis


Schizomycetes: Eubacteriales


Approved name:

Bacillus thuringiensis subsp. israelensis.


Bacillus thuringiensis subsp. israelensis occurs naturally in soil (Serotype H-14, strain SA-3 is widely used for development as an insecticide).


Produced by fermentation, as for otherBtk.


Only Diptera: e.g. mosquito and blackfly (simuliid) larvae and fungus gnats (Gnatrol).


Mode of action:

Insecticide with stomach action as for Btk.


As for Btk except that the crystal inclusions derived from Bti are the most insoluble of any Bt crystals, requiring a very high pH (>11) for full solubilisation. Bti produces five different insecticidal proteins and all have dipteran activity although one toxin, the 27kDa cytolytic toxin, appears to synergise the others. The effects of Bti on larvae are as for Btk. Sometimes its effects are more rapid: heavily infested mosquito pools may be dramatically covered by floating, dying larvae within twenty minutes of application of Bti granules. Cannibalising habit of larvae help spread of the infection The spores cause no significant increase in mortality and so spore-free products are marketed to minimise the weight and to suit during aerial application, in contrast to Btk in which the action of spores is significant in some host species.



Sold as aqueous suspensions, briquettes (BR), flowable concentrates, granules (GR), wettable powders (WP) and slow release rings.


.Aqua Bac XT.


Applied hand-held application equipment to water bodies to be treated. Rates of application increase with the age of larvae to be treated and the organic content of the water. Rates between 2 and 4 kg of product per hectare are usual. Spray on the soil surrounding germinating seedlings to control fungus gnats.



B.thuringiensis subsp. israelensis formulations contain delta-endotoxins with or without spores.

Storage conditions:

Store under cool and dry conditions. Stable for up to two years if stored under recommended conditions.


Apply Bti alone and avoide pesticide mixing. Incompatible with strong oxidising agents, acids and bases.


LC50 for water feeder guppies (Toecilia reticulata) >156 mg/litre (as Teknar). LC50 (96 hours) Daphnia pulex >25 mg/litre (technical).


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