Navistar adopts poison pill

June 20 (Reuters) - Truck and engine maker Navistar International Corp said it adopted a shareholder rights plan to "deter coercive takeover tactics," and declared a dividend of one right on each outstanding share of common stock.

The rights will be exercisable at $0.001 each until the tenth business day following the acquisition of beneficial ownership of 15 percent of the company's common stock, Navistar said.