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Florida citrus utilizing 224°C or 235°C horticultural mineral oils (HMO)*

By Carl C. Childers


The objective of this work was to compare HMO-only foliar spray programs with grower´s usual practices for the control of the fungal pathogen greasy spot, Mycosphaerella citri Whiteside, and for suppression of arthropod pests, primarily the citrus rust mite, Phyllocoptruta oleivora (Ashmead), the pink citrus rust mite, Aculops pelekassi (Keifer), and the spider mites, Eutetranychus banksi (McGregor) and Panonychus citri (McGregor). Four cooperators with 2.38 to 5.22 hectare blocks of either ‘Hamlin ’ or ‘Valencia ’ oranges were switched to 224°C or 235°C horticultural mineral oil (HMO)-only foliar spray programs applied at 46.8 liters/hectare for four years. HMO applications varied from one to three applications in the test blocks per location at each year. Cooperating grower spray programs included various fungicides, acaricides, insecticides, and HMOs. First year transition from the standard fungicide-insecticide-acaricide programs resulted in active citrus rust mite development, and multiple HMO treatments were required in three of the four sites for their control. Subsequent rust mite populations in years two, three, and four did not develop in three of four sites using the HMO-only foliar spray programs. Spider mite densities in the four HMO blocks never reached levels of economic injury during any year of the study. One of the cooperators was dropped after the third (2002) season, as the test block in his property was sprayed sometime early in 2003 with a pesticide that eliminated beneficial mite populations. No secondary arthropod or disease problems developed in any of the remaining three HMO-only blocks through Marc

Year: 2013
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