Trollhaugen
Synonym: ES 3-22-18		Parent: MN 78 x Venus		Origon: Elmer Swenson, Osceola		Vitis: Riparia Hybrid
			Blue seedless table grape. Hardy to near -30 F. Medium to large blue berries are born on compact, medium sized clusters. Sweet and mild Concord-like flavor. Ripens extremely early to high sugar but can hang in good condition until a hard frost. Selected by Elmer Swenson. Ref 1 A hardy, blue, seedless table grape. Origin: developed by Elmer Swenson, Osceola, Wis. MN 78 x Venus; sel. In 1985; tested as E.S. 3-24-7; released in 2000; not patented. Fruit: blue; round; small to medium size; sugar content 22%; flavor is fruity American but mild; seedless with soft seed remnants; medium skin; ripens 10 Sept. in central Minnesota. Cluster: small to medium; cylindrical, semi-loose. Vine: hardy to –38 ｰC; high vigor; resistant to downy mildew and black rot. Ref 2 Slarsen: Please notice that ES 3-24-7 is not correct !! Trollhaugen—blue to black Swenson hybrid small seedless berries and small to medium clusters, used in sweet red table wines and as a fresh eating grape. Ref 3 Elmer Swenson wrote in Nov. 1997: (Mn 78x Vesuv) beautiful large clusters, blue of excellent eating quality. Early ripening seedless.
Table of Characteristics:
Grape color: Blue	Grape size: Large		Cluster size: Medium		Cluster shape: Compact to Semi-loose		Vigor: High
Budbreak: ??	Crop set: ??		Flowering: ??		Flower problems: ??		Sex: Hermaphrodite
Resistant to:
Oidium: Medium	Botrytis: ??		Peronospora: Medium to high		Others: Blackrot resistant		Winter Hardiness: -34 C / -30 F
Harvest:
Harvest: Very Early	Sugar: Up to 22%		Acid: Low		Particular flavour: Mild Concord-like		Use: Seedless Table grape

Ref: Unknown xx, Editor Slarsen, Picture, ph. Otto.