I am not aware of any attempt to publish such a list in English previously. I have had to rely on sources in Danish and apologise for mistakes made in consequence.
KNUDAGE RIISAGER: A CATALOGUE OF THE ORCHESTRAL MUSIC
1918-20:Overture "Erasmus Montanus": Danish Pictures No.1, op.1: 12 minutes + (Chandos and Dacapo cds)
1919/45:"Bellman Variations" for orchestra: 10 minutes
1921: "Florez and Blanzeflor" for chorus and orchestra
1922: "Til dig" for reciter and chamber orchestra
1923: "Jomfru Morgenstund" for mezzo-soprano and chamber orchestra
Symphonic Sketch for chamber orchestra
1924: "For Sent" for soprano and orchestra
"Suite dionysiaque" for chamber orchestra, op.6: 17 minutes
1925: Symphony No.1, op.8: 25 minutes + (Dacapo cd)
1926: Variations on a Theme of Mezangeau for orchestra, op.12: 20 minutes
"T. –Doxc. Poeme Mechanique" for orchestra, op. 13: 7 minutes
1927: Symphony No.2, op. 14
1928: Ballet "Benzin", op.17: 43 minutes + (Dacapo cd)
Comedy Overture No.1
1929: "Klods Hans": Danish Pictures No.2 for orchestra, op.18: 9 minutes + (Dacapo cd)
1930: Ballet "Cocktailt Party", op.19 (unfinished)
"Fatelavn": Danish Pictures No.3 for orchestra, op.20: 9 minutes + (Dacapo cd)
"Comoedie": Danish Pictures No.4 for orchestra, op.21: 9 minutes + (Dacapo cd)
1931: Suite for Small Orchestra, op.23: 14 minutes
Concerto for Orchestra, op.24: 18 minutes
1932: Comedy Overture No.2, op.27: 5 minutes
1933: Concertino for Trumpet and String Orchestra, op.29: 11 minutes + (Danacord and Dacapo cds)
"Marche Tatare" for orchestra: 3 minutes
1934: Little Overture for Strings: 5 minutes + (Danacord cd)
Concert Overture "Primavera", op.31: 5 minutes
"I Anledning Af"-Danish Children's Songs for orchestra: 14 minutes + (Danacord cd)
1935: Symphony No.3, op.30: 19 minutes
Valse lente for small orchestra
1935-36:"Darduse"-Dances from the fairytale play, op.32: 18 minutes + (Dacapo cd)
1936: "Slaraffenland"-Suite No.1 for orchestra-, op.33: 16 minutes + (Danacord and Dacapo cds)
"For the Children's Party" for orchestra: 12 minutes
1937: Sinfonia Concertante for string orchestra, op.34: 14 minutes
Partita for orchestra, op.35: 12 minutes
"Tre danske Peblingeviser" for orchestra: 8 minutes + (Danacord cd)
1938: "Qarrtsiluni" for orchestra, op.36: 11 minutes + (Chandos and Dacapo cds)
"Basta: Epilogo festivo" for orchestra: 5 minutes
1939: "Tolv med Posten"-Six Dances from the ballet, op.37: 11 minutes + (Danacord and Dacapo cds)
Torgutisk Dance for orchestra
1940: "Slaraffenland"-Suite No.2 for orchestra: 14 minutes + (Dacapo cd)
Symphony No.4 "Sinfonia Gaia", op.38: 20 minutes
Variations for orchestra "Frederik II I Ditmarsken", op.39
1941: Finalegalop for orchestra: 3 minutes
1942: Danish Psalm for chorus and orchestra, op. 41: 12 minutes
Jubilee March for brass band
1943: Summer Rhapsody for orchestra: 12 minutes
"Tivoli Tivoli!" for orchestra: 7 minutes
1944: "Monument for Kingo" for orchestra
"Morgensang" for orchestra
"Den Krollede Frits"- a Danish Overture, op. 43
1944-45:Ballet "Fugl Fonix", op.44
1947: Sinfonietta, op.46: 15 minutes
"Song to the Sun" for mezzo-soprano, baritone, chorus and orchestra, op. 47: 20 minutes
Cantata for the Centenary of Carlsberg's Brewery for reciter, soloists, chorus and orchestra
Ballet "Etudes": 40 minutes + (Chandos cd)
1948: Danish Scene for orchestra, op.48: 4 minutes
Festmarsch for concert band
"Sorgepraeludium of Frydesang" for wind band
Chaconne for orchestra, op.50: 12 minutes
1949: "Archaeopteryx" for orchestra, op.51: 16 minutes + (Dacapo cd)
"Foraarskantate" for reciter, chourus and orchestra
1949-50:Symphony No.5 "Sinfonia Serena" for string orchestra and percussion, op. 52: 15 minutes
1950: Variations on a Sarabande of Charles, Duc d'Orleans for string orchestra, op.51: 26 minutes
1950-51:Violin Concerto, op.54: 23 minutes + (Danacord cd)
1951: "Palavas" for violin and piano with orchestra
1952: Toccata for orchestra: 8 minutes
"Pro fistulis et fidibus" for woodwind and strings, op.56: 15 minutes
1953: Suite "Barneland" for small orchestra
1956: Ballet "Manerenen", op.57: 45 minutes + (Dacapo cd)
"Et Forspil" for reciter and orchestra
"Akademisk Forspil og Akademisk Efterspil" for orchestra
"Studentersang" for chorus and orchestra
"Aandeligt Siungkevor" for string orchestra: 10 minutes
1957: Rondo Giocoso for Violin and Orchestra: 5 minutes
1958: Ballet "Stjerner", op.58: 20 minutes
1959: Ballet "Fruen fra Havet", op.59: 40 minutes
1964: Burlesque Overture, op.60: 4 minutes
"Sangen om det uendelige"("Canto dell'infinito") for chorus and orchestra, op.61: 30 minutes
1966: Stabat Mater for chorus and orchestra, op. 62
"Galla Variations" for orchestra: 12 minutes
1971: "Trittico" for orchestra
1972: "Til Apollon, Lysets Gud" for orchestra: 10 minutes + (Dacapo cd)
and
Concerto for Trumpet and wind ensemble ?