Bemisia tabaci Gennadius, one of the most invasive insect pests, has spread quickly nationwide since it was introduced to South Korea in 2008. The use of insecticides is the main management strategy for this pest, but the control efficiency has been decreased due to insecticide resistance. We collected 12 local B. tabaci populations to investigate the regional differences in efficiency and observed the mortality from 14 commercial insecticides applied at recommended concentrations (RC) and dilutions (0.1 RC and 0.01 RC) using the leaf dipping bioassay. Except for etofenprox (46-64%), thiamethoxam (37-60%), pyriproxyfen (21-61%), and pyridaben (61-65%), the other insecticides showed excellent insecticidal efficacy of 70% to 100% at their RC. In particular, flupyradifurone, emamectin benzoate, and cyantraniliprole showed high insecticidal efficacy of over 90% in all of the tested populations. Some insecticides that rapidly decreased in activity (less than 30%) at diluted concentrations or showed high resistance levels in nearby regions were classified for cautious use due to the possibility or potential to develop resistance. The results provide selected insecticides for B. tabaci control by region and could contribute to reducing insecticide abuse and increasing insecticidal efficiency in farming fields.

The objective of this study was to develop a standard for setting a legal system for senior-friendly food. We conducted a web-based survey on 95 food industry workers. Answers to 10 questions in the survey were analyzed using SPSS 19.0. Important factors to consider when it comes to food for seniors are the supply of balanced nutrition, enhancement of functionality, and promotion of convenience. A total of 47 respondents (51.1%) felt the need for a legal system for senior food, and they thought that a certification for senior-friendly food would be advantageous for companies. They said that there should be texture standards to promote ease of chewing, standards for functionality, nutritional standards, and safety standards to certify senior-friendly foods. A total of 41 people (44.6%) said that it was reasonable to classify Japanese food into five levels of senior-friendly foods according to ease of chewing. Certification management received the highest score in implementing an activation plan for senior-friendly food.

Level and distribution of fourteen polycyclic aromatic hydrocarbons (PAHs) in the agricultural water samples collected in the waterways located in Gyeonggi and Gangwon, Korea were determined for monitoring and risk assessment. A simplified, fast but effective extraction and clean-up methods combined with gas chromatography tandem mass spectrometry (GC-MS/ MS) was employed to measure the concentration of the target compounds. The extraction of the analytes of interest in water sample (10 mL) was performed with acetonitrile (10 mL) and the salt. To purify the target PAHs, the clean-up procedure was employed with 2 mL tubes of dispersive solid phase extraction. The optimized method was validated with recoveries, method detection limit (MDL), accuracy and precision. Good recoveries for each PAHs at 10 and 25 μg L-1 were achieved (60 to 110%, with RSD <20%) with linearity (>0.99). MDL for all the analytes was achieved with 0.2 μg L-1. GC-MS/MS results showed that concentration of phenanthrene in the water samples from Gyeonggi (20 sites) ranged from 0.82 to 2.56 μg L-1 and from Gangwon (15 sites) ranged from 0.83 to 1.62 μg L-1. Other PAHs were not found in the water samples but the continuous monitoring for these areas were required.