Abstract
The San Jose scale, Aspidiotus perniciosus Comst., has been gradually increasing on peach trees in the South in spite of annual dormant treatments with lime-sulphur. During the years 1922, '23 and '24, lubricating oil emulsions were compared with the standard lime-sulphur for scale control and tree injury. A 2% lubricating oil emulsion made from either the boiled or cold formulae gave excellent scale control and caused no tree injury, even when twice used in one dormant season Lime-sulphur gave poor control and caused some twig injury. Trees incrusted and covered with crawlers require two dormant applications of 2% emulsion for effective control while under similar conditions lime-sulphur applied twice was ineffective. Summer treatments with oil emulsions caused premature defoliation and were less effective than winter treatments.
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