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Proper Application Concentration of Oleic Acid for Eco-friendly Control of Whiteflies by Two-fluid Fogging System in Greenhouses  

Kim, Sung Eun (Sangmyung University)
Lee, Sang Don (Sangmyung University)
Lee, Moon Haeng (Buyeo Tomato Experiment Station C.A.R.E.S.)
Sim, Sang Youn (Gyeonggi-Do Agricultural Research & Extension Services)
Kim, Young Shik (Sangmyung University)
Publication Information
Journal of Bio-Environment Control / v.21, no.3, 2012 , pp. 299-304 More about this Journal
Abstract
In this work, we experimented with the two-fluid fogging system that eco-friendly prevents whiteflies in greenhouses in order to find the optimal concentration of oleic acid supplied through the system and to evaluate the control value of three consecutive treatments. The first experiment, which was to find the optimal concentration of oleic acid, used "Dotaerang Gold" tomatoes grown in stand-alone plastic greenhouse at Buyeo Tomato Experiment Station. We tested three levels of concentration of oleic acid, which were 0, 2000, and 4000 ppm. The second experiment, which was to evaluate the control value of three consecutive treatments of oleic acid, used "Rokusanmaru" tomatoes grown in Venlo type glasshouse at Gyeonggi-Do Agricultural Research & Extension Services. In this experiment, oleic acid of 2000 ppm was applied three times with two days intervals. The number of whiteflies was counted 2 two days after the last application of oleic acid. Even when oleic acid was not being applied, the two-fluid fogging system was run from 9:00 am to 5:00 pm whenever the temperature is higher than $25^{\circ}C$ or the humidity is lower than 75%. In the first experiment, the control value was 81.6% with 2000 ppm of oleic acid and 93.6% with 4000 ppm. It means that the higher the concentration is, the greater the control value. In the second experiment, 2000 ppm treatment resulted in 85.8% of the control value, which is higher than the required standard for insecticides. Hence, spraying oleic acid with the concentration of 2000 ppm three times with two days intervals turned out to be a very effective in the eco-friendly prevention of whitefly.
Keywords
fog nozzle; insect control value; mist; natural repellent;
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