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U.S. corn, wheat and soybean futures fell after President Trump threatened tariffs on all Mexican goods, starting at 5% and rising until illegal migration stops. The grains had posted large monthly gains, so profit-taking added to the decline.
Heavy May rains had delayed planting and may have reduced the quality of the Plains wheat crop.
Mexico is the top foreign buyer of U.S. corn and wheat, so tariffs could cut export demand and weigh on prices. A weaker peso would also make Mexican imports of U.S. grain more expensive.
grainews.caMark Weinraub, GFM Network News2019年5月31日在过去 683 次看跌的贸易事件之后，玉米 在 5 个交易日内中位数变动 -0.2%（47% 上涨；中间一半区间为 -1.7% 至 +1.6%），20 个交易日内为 +0.3%。
在过去 803 次看跌的贸易事件之后，大豆 在 5 个交易日内中位数变动 +0.0%（51% 上涨；中间一半区间为 -1.7% 至 +1.7%），20 个交易日内为 +0.9%。
在过去 375 次看跌的贸易事件之后，小麦(SRW) 在 5 个交易日内中位数变动 -0.2%（47% 上涨；中间一半区间为 -2.0% 至 +1.1%），20 个交易日内为 -0.1%。
历史可比事件尚不足，暂无法给出历史解读。
各商品基准价相对事件前最后收盘价的变动。历史数据汇总同类过往事件；仅描述已发生的情况，不代表未来走势。不构成投资建议。
On May 31 Trump's Mexico tariff threat sent wheat, corn and soy lower, and profit-taking after large monthly gains added to the selling, which fits the sharp drop in the final session.
