LABORATORY EVALUATION OF THE TOXICITY AND REPELLENCY OF CORIANDER SEED TO FOUR SPECIES OF STORED-PRODUCT INSECTS¹

Seed and oil of Coriandrum sativum L. (coriander) were evaluated for their contact toxicity to adults of Callosobruchus maculatus (F.), Sitophilus oryzae (L.), Lasioderma serricome (F.), and Tribolium confusum Jacquelin du Val; and for their repellency to S. oryzae and T. confusum. The acetone extract of the seed was topically nontoxic to C. maculatus, slightly toxic to L. serricorne and T. confusum, and moderately toxic to S. oryzae at 40 μg/insect and higher at 48 hr after application. The oil was topically nontoxic to C. maculatus, L. serricome, and T. confusum, and was moderately toxic to S. oryzae at 30 μg/insect and higher.

Both the acetone extract and oil were repellent to S. oryzae when they were used to surface treat the wheat at dosages of 0.2, 0.1, and 0.05%, with the oil slightly more repellent than the extract at the 0.2% concentration. Both the extract and oil repelled T. confusum when the insects were exposed to the surface of the treated paper at concentrations of 600, 400, 200, and 100 μg/cm², with the extract more effective than the oil