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[The duration of action of Bacillus thuringiensis spp. israelensis and Bacillus sphaericus after encapsulation by infusoria Tetrahymena pyriformis].

The study of the duration of the insecticidal activity of a mixture of infusoria with each of these bacteria revealed differences in the pattern of their relations during their long contact. T. pyriformis may be used for the prolongation of its insecticidal action if Bti is applied. An increase in the duration of this action depends on the viability of tetrahymena in the experimental flasks and on the presence of free spores and crystals of Bti. The prolongation of the action may be associated with the multiplication of this type of bacteria in the digestive vacuoles of infusoria. The use of Bsph in the mixture with T. pyriformis caused no increase in the insecticidal activity of bacteria. Tetrahymena increased the duration of Bsph and even reduced the period of its larvicidal activity. Tetrahymena used a sporocrystalline complex of Bsph as food and reduced its water concentration.

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