NEW YORK, April 12 (Reuters) - Arabica coffee futures on ICE rallied to their highest price in 18 months on Friday, on worries over adverse weather in Brazil and tightening supplies in robusta grower Vietnam.

Robusta futures hit their highest price in at least 16 years, while the relentless rally in cocoa continued.

COFFEE

* July arabica coffee settled up 3.1 cents, or 1.4%, at $2.2045 per lb, after touching an 18-month high of $2.2975.

* Arabica prices have benefited from a sustained robusta price rally, which has prompted roasters to boost the amount of arabica coffee they use in blends and reduce robusta volumes.

* "Concerns surrounding supply in Vietnam and below-average rainfall in Minas Gerais, a Brazilian region which produces around 30% of the country's arabica crop, have contributed to the tightening of the market," Fitch Solutions said in a note.

* July robusta coffee rose 1.6% to $3,852 a metric ton. It earlier hit $3,903, the highest since the current form of the contract started trading in 2008.

* There are deepening concerns about the crop outlook in Vietnam because of dry conditions, with dealers saying that farmers remain reluctant to sell.

COCOA

* July London cocoa settled up 427 pounds, or 5.2%, at 8,640 pounds per ton, after hitting a record high of 8,652 pounds. It gained 13% in the week.

* Top producers Ivory Coast and Ghana are in the midst of one of their worst harvests.

* ICE-monitored cocoa inventories in U.S. ports are at their lowest level in three years.

* July New York cocoa rose 5.9% to $10,475 a ton, after touching a record peak of $10,511.

SUGAR

* May raw sugar settled down 0.4 cent, or 1.9%, at 20.45 cents per lb, after slumping to the lowest price since late December of 20.41 cents. It lost 7% in the week.

* Dealers cited high stocks levels in Brazil at the end of the 2023/24 crop and the good start to the new crop.

* Brazil's center-south sugarcane crushing totalled 5.04 million metric tons in the second half of March, data from industry group UNICA showed, up 6.5% from a year ago.

* May white sugar rose 0.2% to $629.10 a ton. (Reporting by Maytaal Angel and Marcelo Teixeira; Editing by David Goodman, Paul Simao and Shilpi Majumdar)