Recently, Metcalfa pruinosa is the pest that can not be easily controlled due to its wide host range. Therefore, it seems necessary to develop a trap plant that can block the entry of M. pruinosa into the farm. We have examined the host preference of M. pruinosa in previous studies and verified their attractiveness to these pests for some favored plants(bean, perilla, sunflower and sesame). We divided the plants used in the experiment into young and maturing stages. In the yougn stage of the plant, the soybeans were highly suscetible to M. pruinosa, but the sunflower was the most influential in the mature stage. Therefore, we selected sunflower as a trap plant to M. pruinosa and conducted a field survey. The sunflower attracted effectivley M. pruinosa in aronia cultivation system. But the time of our experiments was at the nymphal stages of M. pruinosa and at the beginning of adult emergence. Therefore, we plan to conduct experiments at the peak period of adult emergence and develop the trap with attractants.

The problem of disposal of brine due to increased MD/RO desalination plant has recently become a big social issue. The chlor-alkali process through electrolysis of brine has been studied as a method to overcome this problem. In order to increase the electrolysis efficiency, a pretreatment process for removal of hard substances must be preceded. In this study, we investigated the mechanism of removal of hardness through chemical precipitation. As a result, Ca was greatly influenced by addition of Na2CO3, and Mg was strongly influenced by pH. Also, the addition of NaOH and Na2CO3 enabled simultaneous removal of Ca and Mg, and showed a removal efficiency of 99.9% or more. Finally, the residual concentrations of Ca and Mg in the brine after the reaction were 0.14 and 0.13 mg/L, respectively. Saturation index was calculated using Visual MINTEQ 3.1, and solid phase analysis of the precipitate was performed by FE-SEM and PXRD analysis. It was confirmed that precipitate formed by the formation of calcite and brucite.