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Horticultural Oil Sprays to Control Pests of Landscape Plants: An Industry Survey

During 1983-84, a 3-page questionnaire was distributed to selected Green Industry companies to document oil-use practices. More than half of the respondents had never used oil for pest control. The majority of those who used oil, found it to be an effective product to control or deter scale insects and mites. From this group of people, 54% found pest control to be improved when a synthetic organic pesticide was added to the oil. Most respondents did not report phytotoxicity problems. However, plants most frequently injured (presumably from the oil applications) were aucuba, cryptomeria, hickory /pecan, Japanese holly and Japanese, sugar, and red maples. The majority of applications (64%) were made in the spring and only 8% (of all applications) were applied in the summer.