| 摘要 |
<p>The invention relates to inseticidal compositions comprising an insecticide from Bacillus thuringiensis. The invention also relates to a process for the preparation of formulations of such compositions and the use of the insecticidal compositions for the control of mosquito larvae. The composition of the invention comprises an insecticidal component derived from the strain Bacillus thuringiensis M-H-14, a carrier component, a component for the protection against sun-light and optionally feeding filler and excipients. The insecticidal component from Bacillus thuringiensis M-H-14 is a delta-endotoxin produced by the microorganism when in a state of dying. The carrier of the invention is of plant material like peat, corn cobs, corn grain, wheat strain, cork and palm seed grain. The method for the preparation of the insecticidal component comprises the steps of fermenting Bacillus thuringiensis M-H-14 in a fermentation reactor until completion of sporulation, separating the solid components from the fermentation reactor by centrifugation to obtain a concentrated solution called concentrated cream, spray drying the concentrated cream to obtain a wettable powder on diluting the concentrated cream with an aqueous solution to obtain a pourable aqueous solution.</p> |
