Gary Mankulish of Prince Georges and Ben Brundred III of Congressional, two tournament-tested golfers, moved into the final of the Maryland State Amateur Championship at Argyle yesterday and will meet in the 36-hold climax today.

Mankulish, who won the title in 1975 and was runner-up last year, bested Jimmy Glass of Turf Valley, former D. C. schoolboy champion, 2 and 1.

Brundred turned back 16-year-old Jack Skilling, of Chevy Chase, 5 and 3.

Earlier, Mankulish disposed of Jim Kleaman, Maryland golf and Country Club champion, on the 19th hole. Glass gained the semifinals by beating Mike Toomey, Crofton, also on the 19th.

Brundred beat Jim Debusk, Swan Creek, 6 and 5, in the morning and Skilling eliminated Bob Lang, Country Club of Maryland, 3 and 2.

The big break for Mankulish in the afternoon match played in the rain came on the ninth hole. It was even at that point.

Mankulish was on the ninth green in three, some 20 feet from the hole and lagged the ball to within three inches. Glass elected to leave his opponent's ball there when he putted from 15 feet away.

His ball knocked Mankulish's ball in the hole. Glass' ball came to rest a foot away. Under Rule 35-D in match play, when a player knocks an opponent's ball into the hole, it is counted as the continuation of the previous stroke for the opponent, which meant Mankulish got a 4 to Class' 5 and won the hole.

Mankulish birdied the 10th from 15 feet and the 11th from three feet. He won the 12th with a par to go 4 up. But he lost the 13th with a double bogey and the 15th with a bogey. The 16th was halve with bogeys and the 17th with pars to end the match.