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Published online by Cambridge University Press: 19 September 2011
Twenty isolates of Bacillus thuringiensis Berliner belonging to vars. kenyae, kurstaki, aizawai and ostriniae, were tested for their activity against first instar larvae of Boarmia selenaria Schiffermüller. Isolate 30-11 (serovar 3a3b, kurstaki) proved to be 8% more effective than the standard HD-l-S-1980 (serovar 3a3b, kurstaki). This isolate was 13% more larvicidal to third instar larvae than the standard. Significant lower mortalities than the standard were obtained with the isolates: 400-1, 400-2, 400-3, 400-4, 400-8, 400-11, 400-12, 400-14, 30-2, 30-12, 30-13, 30-15, Ser. 17 and BL8a8c. Isolates 400-5, 400-6, 400-7, 400-9 and 400-10 were similar in larvicidal effectiveness to the standard.
Vingt souches de Bacillus thuringiensis Berliner qui appartiennent aux variétés: kenyae, kurstaki, aizawai et ostriniae, ont été testées pour leur activité contre le prémier stade de la larve de Boarmia selenaria Schiffermüller. La souche 30-11 (sérovar 3a3b, kurstaki) s'est avérée être 8% plus effective que le standard HD-l-S-1980 (sérovar 3a3b, kurstaki). Cette souche a été de 13% plus larvicide pour le troisième stade des larves que le standard. Les souches 400-1, 400-2, 400-3, 400-4, 400-8, 400-11, 400-12, 400-14, 30-2, 30-12, 30-13, 30-15, Ser.17 et BL8a8c prouvaient une baisse de mortalité obtenue par rapport au standard. L'effectivité comparable au standard étant de: 400-5, 400-6, 400-7, 400-9 et 400-10.
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