De La Rose, a champion turf filly and grade I stakes producer, was euthanized Tuesday, March 6, at Henryk de Kwiatkowski's Calumet Farm near Lexington because of the infirmities of old age. The 23-year-old mare had dropped weight and been weakened by the harsh winter, according to the farm.De La Rose was the highest-priced filly sold at the 1979 Saratoga yearling sale. Bred by Dr. and Mrs. R. Smiser West and trainer MacKenzie Miller, De La Rose (Nijinsky II--Rosetta Stone, by Round Table) was bought by de Kwiatkowski for $500,000.Trained by Woody Stephens, De La Rose was a stakes winner at Belmont Park as a 2-year-old and champion turf filly the following year in 1981. She scored her big win against males in a division of the Hollywood Derby (gr. IT) and also beat them in winning the Saranac Stakes (gr. IIT) in New York and the Long Branch Stakes (gr. IIIT) at Monmouth Park. Against fellow distaffers, she won the Diana (gr. IIT), Athenia (gr. IIIT), and Lamb Chop Handicaps, plus the E.P. Taylor Stakes (gr. IIIT). Her runner-up finishes included efforts in the Kentucky Oaks (gr. I) and Flower Bowl Handicap (gr. IIT).De La Rose was retired her 4-year-old season in 1982 with a record of 11 wins from 26 starts and earnings of $544,647. She was bred the following year to first-year stallion Conquistador Cielo, who was 1982 Horse of the Year for de Kwiatkowski. The mating between the two champions produced Conquistarose in 1984. Bred in the name of de Kwiatkowski's Kennelot Stable, Conquistarose won the Young America Stakes (gr. I) as a 2-year-old. He earned a career total of $487,055.De La Rose produced a total of seven named foals, including additional graded stakes winner De La Devil and French stakes-placed Maratha. A member of De Kwiatkowski's broodmare band, De La Devil is not in foal for this year and is booked to Conquistador Cielo. De La Rose was buried at Calumet.