As an expert in the field of agriculture and biotechnology, I can provide you with an accurate answer regarding the ownership of Pioneer seed.

English Answer:
Pioneer Hi-Bred, a well-known developer and distributor of advanced seed genetics, was originally an independent company. However, in 1999, it became a part of DuPont through acquisition. Later, in 2015, DuPont announced a merger with Dow Chemical Company. Following the merger, the combined entity, DowDuPont, was created. In 2017, DowDuPont decided to split into three separate companies, including one focused on agriculture. This agricultural division became Corteva Agriscience™, which is a publicly traded company as of June 2019. Therefore, as of my last update, Pioneer is a part of Corteva Agriscience and not owned by Monsanto.

中文回答：
先锋良种（Pioneer Hi-Bred）是一家知名的先进种子遗传学开发商和分销商，最初是一家独立公司。然而，在1999年，它通过收购成为杜邦（DuPont）的一部分。此后，在2015年，杜邦宣布与陶氏化学公司（Dow Chemical Company）合并。合并后，创建了联合企业陶氏杜邦（DowDuPont）。2017年，陶氏杜邦决定分成三个独立的公司，其中包括一个专注于农业的公司。这个农业部门成为了科迪华农业科技（Corteva Agriscience™），自2019年6月起成为一家公开交易的公司。因此，截至我最后更新的信息，先锋良种是科迪华农业科技的一部分，而不是孟山都（Monsanto）拥有。

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"Farmers will not buy soybeans without Roundup Ready in it. So, that gives Monsanto an amazing amount of leverage," says Jim Denvir, a lawyer working for DuPont. DuPont owns Pioneer, a competing seed company. ... Those agreements control which other genetics competing companies can mix with the Roundup Ready trait.read more >>