During the years of 1920 to 1922 inclusive, the San Jose Scale, Aspidiotus perniciosus, has increased very rapidly in southern Illinois and neighboring states. In southern Illinois it has resulted in the loss of over one thousand acres of commercial orchard annually treated with lime sulphur. Experimental work was carried out in the spring of 1922 with miscible oil and lubricating oil emulsion, similar to those used by the Federal Bureau of Entomology in Florida. The lubricating oil emulsion gave nearly as good control of the scale as did the miscible oil and a much higher degree of control than was obtained from the best grades of liquid lime sulphur. As a result of this work the lubricating oil will be generally used in southern Illinois during the coming year.
Document Type: Research Article
Publication date: April 1, 1923
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