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Piper nigrum L. seed is well known for its insecticidal properties against storage pests. P. nigrum dust formulation (Pn10D) was prepared by mixing pulverized seed powder of P. nigrum (10%) and fly ash (90%). Pn10D was tested against pulse beetle Callosobruchus maculatus (F.) Pn10D at 4.00 percent caused cent percent mortality of C. maculatus after 72 hr after the treatment. Pn10D 4.00 percent was most effective in reducing the oviposition. Egg hatchability of C. maculatus ranged between 57.12 (Pn10D 2.00 %) and 73.73% (Pn10D1.00 %). Only 7.00 beetles emerged from the seeds treated with Pn10D 4.00 per cent. Seed weight loss was 0.35 percent in Pn10D 4.00 and 3.50 percent. Germination ranged between 57.33 (Pn10D 0.50 %) and 93.33 percent (Pn10D 4.00 %).
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