In order to evaluate the effect of repetitive verdant horticultural oil sprays on plant growth and appearance, 32 different species/cultivars of shade trees, evergreens, and woody shrubs were sprayed three times during the 1994 growing season with 2% SunSpray Ultra-Fine spray oil. Visual phytotoxicity ratings were assigned to treated plants and growth affects were measured by measuring leaf area and incremental twig growth following the last spray application. No phytotoxicity was observed on any of the 32 species/cultivars of woody plants using three repetitive verdant horticultural oil sprays. Collectively, repetitive oil sprays did not significantly affect incremental twig growth or leaf area of treated plants. Results from this study show that repetitive sprays of 2% SunSpray Ultra-Fine spray oil can be used safely on shade trees, evergreens, and deciduous landscape shrubs commonly grown in the upper mid-west.
Microorganisms of Beggiatoa, or a closely related group, have been found to be the cause of an apparent precipitate of sulfur occurring in commercial limesulfur concentrates, making the whole mass of the consistency of thin ketchup. Some data regarding this thickened lime-sulfur is given.The further study of the microorganisms, their iden-tification, the sources of infection, and means of prevention are being investigated.
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