The Relative Effectiveness of the Principal Alkaloids of Sabadilla Seed1

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Abstract
The insecticidal effectiveness of the principal alkaloids isolated from sabadilla seed was tested against Oncopeltus fasciatus and Melanoplus femur-rubrum. These constituents, i.e., veratrine, veratri-dine, cevadine, cevine, hydrochlorides of veratrine and the oil obtained by petroleum ether extraction of the seed, were blended at various levels with inert dusting powder, and controlled dosages were applied to the insects mentioned above. Cevadine was found to possess the greatest toxicity; veratrine, veratridine, and the hydrochlorides of veratrine were less toxic in the order given. Cevine and the oil ob-tained from petroleum ether extractions were non-toxic at the level employed. In kerosene soln. against the milkweed bug, cevadine was found to be the most toxic constituent of the seed to these insects.

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