PALM BEACH GARDENS, Fla. (AP) _ Steve Termeer of Conroe, Texas, and Margaret Platt of Elmsford, N.Y., posted the low rounds of the tournament Saturday to take control of their respective divisions of the PGA Junior Championship.

Termeer shot a 3-under-par 69, giving him a three-day total of 214 at PGA National and opening up a four-stroke lead over the field in the boys' division.

Platt carded the first sub-par round in the girls' division, firing a 1- under 71 for a 54-hole total of 226. She has a two-stroke advantage over Vicki Goetz of Hull, Ga.

Goetz, at 12 the youngest player in the tournament, turned in a 75 Saturday to stand at 228 going into Sunday's final round.

John Aber of Greensburg, Pa., carded a 72 Saturday to remain in second place in the boys' division at 218. Termeer's 69 was equaled by fellow Texan Jeff Gibralter of Dallas, who moved into third place at 221.

Michael Finney of New Orleans is alone in fourth at 222.

While Platt was moving to the front in the girls' division, the second- round leaders dropped back into the pack. Kathy Highfill of Monroe, La., slipped to 79 for a 230 total, and Cathy Stevens of Wichita, Kan., shot an 80 to put her at 231.

Others in contention for the girls' championship include Jean Zedlitz of Pleasanton, Calif., at 229; Anne Jones of Louisville, Ky., at 230; and Dana Lofland of Oxnard, Calif., at 231.