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KMID : 0903619770180020137
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Journal of the Korean Society for Horticultural Science
1977 Volume.18 No. 2 p.137 ~ p.144
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Effects of Machine Oil Emulsion and Potassium Monophosphate Sprays on the control of mitesand Somo Physiological Aspects of Satsume Mandarin (citrus unshiu Mar.) Tree
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Abstract
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Sprays of machine oil emulsion of 2-4% (v/v) on Dec. 30 and of 2% from early Dec. to late Feb., significantly decreased the number of mites in the following spring. The water contents in leaf sprayed with oil on Dec. 30, were higher than those of control in a month after spray, but became similar after two months. The contents of glucosides in leaf were decreased by oil spray of higher cone. especially reducing sugar one month after spray and crude starch two months after. Oil spray during winter tended to increase the defoliation and to decrease the flower bearing, but the effect was insignificant. It was concluded that the spray of 2% machine oil emulsion form Jan. to Feb. may be the most profitable for the purpose of the control of mites.
The results of the analysis of leaves to confirm the absorption of foliar sprayed potassium mono phosphate, were uncertain and the effect of the phosphate on the defoliation and the flower bearing also was insignificant. The effect of potassium monophosphate spray during winter, especially with machine oil emulsion, was considered to be further explored.
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