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Abstract

TOP 76-6: a new sweet sorghum variety for sirup production.

Abstract

New Sorghum bicolor variety TOP76-6, released in 1994, was selected from the F2 progeny of the emasculated cross Mer. 60-2 × Brandes and the progeny were advanced the using pedigree breeding method. Panicles are erect and semicompact while seeds are white with a corneous endosperm. TOP76-6 is similar to Dale and Bailey in maturity but is normally shorter and resistant to lodging. Optimum crop density is 35 000-40 000 plants per acre. Data on agronomic, yield and quality character over 1992 and 1993 at Blairsville, Georgia are tabulated. TOP 76-6 has a Brix equivalent to Dale and slightly higher than Bailey. Sugar yield is comparable to Dale and Della but lower than Bailey. Syrup yield is equivalent to M81-E and Dale but less than Bailey. TOP 76-6 is highly resistant to foliar anthracnose caused by Colletotrichum graminicola, and intermediate to good resistance is shown to grey leaf spot (Cercospora sorghi), zonate leaf spot (Gloeocercospora sorghi), rough leaf spot (Ascochyta sorghina), bacterial leaf stripe (Pseudomonas andropogoni) and pokkah boeng twisted top caused by Fusarium moniliforme [Gibberella fujikuroi] var. subglutinans. TOP76-6 is resistant to injury from methyl parathion and other commonly used insecticides. Although TOP76-6 is lower than Bailey in juice production, the good disease resistance, short stature, good standability and high quality syrup give the cultivar good market appeal in north Georgia and the Appalachian region.