* Palm charts first decline in three sessions

* Sharpest fall since Aug. 18Market weaker on

lower-performing competing oils - trader

* Palm seen supported at 2,522 rgt/T

(Updates latest prices)

26/08/206 (Reuters) - Malaysian palm oil futures recorded their first session of declines in three on Thursday, weighed down by weaker related vegetable oils, despite strong cargo surveyor export data for August.

Benchmark palm oil futures for November on the Bursa Malaysia Derivatives Exchange fell 1.5 percent to 2,561 ringgit ($639) per tonne at the close of trade, its sharpest drop since August 18.

Palm is in line for its first week of losses after seeing gains for three consecutive weeks on tight supplies and stronger demand. Currently, palm is down 0.7 percent for the week.

Traded volumes stood at 41,688 lots of 25 tonnes each on Thursday evening, below the 2015 average of 44,600.

"Bean oil, soybean, and Dalian are all lower," said a futures trader from Kuala Lumpur, referring to China's Dalian Commodity Exchange.

Chicago soybean futures hit their lowest since mid-August on expectations of a bumper crop harvest.

The Chicago Board of Trade soybean oil December contract fell 1 percent, while the January soybean oil contract on the Dalian Commodity Exchange dropped 1.4 percent.

Palm oil exports rose 31.1 percent during the August 1-25 period compared with a month ago on better Indian demand, according to data from cargo surveyor Intertek Testing Services, but palm's downtrend remained.

"There are no aggressive buyers here yet, and palm's nearby month prices are already at a premium," said the trader.

Palm oil is expected to seek a support at 2,522 ringgit per tonne before resuming its uptrend, showed analysis by Reuters market analyst for commodities and energy technicals Wang Tao.

Palm, soy and crude oil prices at 1039 GMT

Contract Month Last Change Low High Volume

MY PALM OIL SEP6 2800 -37.00 2790 2825 730

MY PALM OIL OCT6 2650 -30.00 2620 2660 2326

MY PALM OIL NOV6 2556 -39.00 2538 2574 22460

CHINA PALM OLEIN JAN7 5530 -48.00 5446 5616 1314670

CHINA SOYOIL JAN7 6326 -92.00 6264 6420 715824

CBOT SOY OIL DEC6 33.64 -0.34 33.51 34.04 9116

INDIA PALM OIL AUG6 562.50 -3.20 562.00 566.2 1064

INDIA SOYOIL SEP6 653.65 -4.40 652.3 655.8 29060

NYMEX CRUDE OCT6 46.65 -0.12 46.64 47.08 70377

Palm oil prices in Malaysian ringgit per tonne
CBOT soy oil in U.S. cents per pound
Dalian soy oil and RBD palm olein in Chinese yuan per tonne
India soy oil in Indian rupee per 10 kg
Crude in U.S. dollars per barrel

($1 = 4.0100 ringgit)
($1 = 67.0450 Indian rupees)
($1 = 6.6538 Chinese yuan)