Corteva adds to gains on report of possible split; BMO, Oppenheimer differ on need

** Corteva shares CTVA rise 1% to $75.03 premarket, adding to 1.8% increase on Friday

** WSJ reported late Fri that Corteva is exploring splitting its seeds and pesticide businesses, aiming to shield its seeds ops from potential liabilities on pesticide ops

** CTVA did not respond to Reuters request for comment on Fri

** BMO Capital Markets says not convinced break-up is value-enhancing, but Oppenheimer says a carve out make sense from a financial perspective

** Oppenheimer's Kristen Owen adds seeds could fetch an EV of ~41 bln or ~$63/shr and pesticides ~15 bln or $24/share, assuming proportional balance sheet

** As of last close, CTVA shares up 30.4% YTD