Grading Suitable for Commercial Application
Mar 27, 2019


Stickiness in cotton is a serious problem confronting both producers and users. The major causative agent of cotton lint stickiness is the honeydew excreted by the insects whitefly and aphid. The sugar constituents of the honeydew are the reducing monosaccharides glucose and fructose and the non-reducing oligosaccharides sucrose and melezitose. The concentration of the monosaccharides don't seem to change with increasing stickiness grade while that of the non-reducing oligosaccharides and the total soluble sugars increased with increasing stickiness grades. A chemical method based on the determination of total soluble sugars as reducing sugars was adopted. In this method, the sugars of the contaminating honey were extracted and hydrolyzed to monosaccharides by treatment with a weak organic acid. Based on sugars concentration five stickiness grades (0-4) were then established. Because of heterogeneity of honeydew contamination even within a single cotton plant, at least ten determinations of sugars concentration are required and the average of these is taken as the sugar concentration for a single cotton lint sample. The chemicals used are not expensive and their reagents are rather stable and do not require daily preparations. The equipment is not complicated. The test is easy to run and can be perfected quickly.

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