Overnight trading saw corn, soybean and wheat futures start the week lower after closing out last week on a higher note, with soybeans closing Friday’s session at multi-year highs. The dip comes as Commodity Futures Trading Commission officials report the highest volume of net-long futures contracts in over a year, a sign that speculators and money managers are bullish on the grains in the long term. Prices look to be tracking harvest weather, which is largely dry in the Plains and Midwest as another storm — Tropical Storm Beta — makes landfall in the Delta region, bringing heavy rain and storm surge to that region. Read more about these major developing stories.