September London cocoa settled down 7 pounds, or 0.4 percent, at 1,646 pounds a tonne, its weakest since early March. Both future contracts attracted technical selling after falling below their 200-day moving averages earlier this week, pushing them near oversold levels on the 14-day relative strength indices.
"Weather outlook is pretty good ... production seems to be getting a little bit stronger," said Peter Mooses, senior market strategist for RJO Futures in Chicago, referring to West Africa.
"In New York, my next support level would be the November 10 high of $2,236. But really, by breaking these levels here, we could be entering into a bear market," said Jason Estrada, senior trader at INTL FC Stone in Miami.
"We're in an instance where the funds - I don't know if they want to be short, but they no longer want to be long," said Estrada.
October raw sugar was unchanged at 11.19 cents per lb, after trading as high as 11.35 earlier in the session.
Data from top grower Brazil showed mills in the main center-south region crushed 45 million tonnes of cane in the first half of July, slightly below the 47.7 million tonnes in the same period last year.
The report "has not been enough to spark the market into any major reaction," James Liddiard, of consultancy Agrilion, said in a note.
Some dealers had anticipated a more bullish report, Liddiard wrote, indicated by the increase in prices prior to the report's release and their subsequent retreat.
October white sugar settled up for a fourth straight session, gaining $1.30, or 0.4 percent, to $327.40 a tonne.
Qatar is building a sugar refinery to avoid supply disruptions amid continued Gulf tensions.
September arabica coffee was little changed, settling up .0005 cent, or .05 percent, at $1.1100 per lb.
September robusta coffee settled down $13, or 0.8 percent, at $1,680 a tonne.
The July robusta contract, supported by tight deliverable supplies, surged to a $107 premium over September ahead of expiry on Wednesday, marking a contract high in a volatile session.