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UPDATE 4-Bayer lifted by likely new trial in $250 mln weedkiller case


* Shares up 4.6 pct after initial 6.4 pct gain * Prospect of new trial, avoiding a lengthy appeal * Tentative rulings often finalized with few changes * Bayer stock still 16 pct below level prior to initial verdict (Adds shares, analyst comment) SAN FRANCISCO/FRANKFURT, Oct 11 (Reuters) - The prospect of a fresh trial that could overturn $250 million damages against Bayer's Monsanto unit lifted the German company's shares, after an August ruling that it failed to warn users of the alleged cancer risks of its weedkillers. The original verdict wiped 10 percent off the value of the company and marked the first such decision against Monsanto and its glyphosate-containing weedkillers Roundup and Ranger