Comparision of the Residue Property of Insecticide Bifenthrin and Chlorfenapyr in Green Onion and Scallion under Greenhouse Condition

In order to use in the classification of minor crop for the mutual application of safe use guideline, it was compared a green onion with a scallion on the residue property of insecticide bifenthrin and chlorfenapyr. After pesticides were applied 2 times with 1 week interval in that day of harvest, 3 days, 7 days, 10 days and 14 days before harvest, vegetables were harvested, and the residue of pesticides was investigated. Base on the residue in that day of harvest, the deposit of spray solution in vegetables was calculated. The deposit of spray solution of bifenthrin was 123.0 mL/kg in a green onion, and 74 mL/kg in a scallion. In case of chlorfenapyr, it was calculated 126.5 mL/kg in a green onion, and 70.0 mL/kg in a scallion. When the amount of the deposit of both pesticides was compared a green onion with a scallion, it was higher in a green onion. On the other hand, it was estimated the predicted dissipation curve of pesticides in a green onion and a scallion during cultivation. The dissipation curve of bifenthrin was y = 1.0334 $e^{-0.0602x}$ ($R^2$= 0.8606) in a green onion, and y = 0.7693 $e^{-0.1823x}$ ($R^2$= 0.9756) in a scallion. In case of chlorfenapyr, it was y = 2.2603 $e^{-0.0519x}$ ($R^2$= 0.9043) in a green onion, and y = 1.2940 $e^{-0.1051x}$ ($R^2$ = 0.9782) in a scallion. The half-life of bifenthrin was 11.51 days in a green onion, and 3.80 days in a scallion, respectively. Also, it was estimated half-life in chlorfenapyr, it was 13.35 days in a green onion, and 6.59 days in a scallion, respectively. The half-life of both pesticides in a green onion was longer than in a scallion. When both vegetables were compared with the residue property, the deposit of spray solution and half-life of dissipation in a green onion were more than those in a scallion.

시설재배 쪽파와 부추에서 살충제 Bifenthrin과 Chlorfenapyr의 잔류특성 비교

일시에 수확하는 경채류 중 쪽파와 부추에 대한 살충제 bifenthrin와 chlorfenapyr의 잔류특성을 비교 조사하였다. 수확일을 기준으로 각각 1주일 간격으로 2회 살포한 후 수확당일, 수확 3일 전, 수확 7일 전, 수확 10일 전 및 수확 14일 전에 시료를 수거하여 잔류량을 조사하였다. 수확당일의 잔류량을 기초하여 작물 중 농약살포액의 부착량을 환산한 결과, 쪽파의 경우 123.0-125.5 mL/kg, 그리고 부추에서는 70.0-74 mL/kg으로 조사되어 쪽파가 부추에 비해 더 많은 살포액이 부착될 수 있는 것으로 나타났다. 각 작물에서 bifenthrin과 chlorfenapyr의 생육기간 중 농약의 분해소실 정도를 조사한 결과, 쪽파에서 bifenthrin의 분해소실곡선은 y = 1.0334 $e^{-0.0602x}$ ($R^2$= 0.8606), chlorfenapyr는 y = 2.2603 $e^{-0.0519x}$ ($R^2$= 0.9043)이었으며, 부추에서는 bifentrhin의 경우, y = 0.7693 $e^{-0.1823x}$ ($R^2$= 0.9756), chlorfenapyr는 y = 1.2940 $e^{-0.1051x}$ ($R^2$= 0.9782)으로 나타났다. 이 분해소실곡선을 이용하여 각 작물에서 두 농약의 분해반감기를 조사한 결과, bifenthrin의 경우, 쪽파에서 분해반감기는 11.51일이었으며, 부추에서는 3.80일로서 쪽파에서의 분해 반감기가 더 긴 것으로 나타났으며, chlorfenapyr의 경우에서도 쪽파 13.35일, 부추 6.59일로 쪽파에서의 분해반감기가 더 길었다. 쪽파와 부추에서 두 농약의 잔류특성이 비교되었을 때 농약살포 후 살포액의 부착량과 작물생육기간 중 농약의 분해반감기는 부추에서보다는 쪽파에서 더 많거나 긴 것으로 나타났다.