Control Standards of Three Major Insect Pests of Chinese Cabbage (Brassica campestris) Using Drones for Pesticide Application

In order to setting the control standard of Chinese cabbage pests using a drone, the downward wind speed, spraying width, and the number of falling particles and particle size were examined using a water sensitive paper with spray different heights (3, 4, 5 m) and flying speeds (3, 4 m/sec). Fore kinds of pesticides for aviation control were used to test the perfect lethal concentration and dose for major pests of Chinese cabbage such as Plutella xylostella, Spodoptera exigua and Spodoptera litura. The number of falling particles in spraying pesticides with drones was 80.5% on the upper side, 14.8% on the vertical side, and 4.7% on the back side. The number of falling particles as different spray heights were 3 m = 53, 4 m = 40 and $5m=39particles\;cm^{-2}$. The number of falling particles as different flying speeds were $3m\;sec^{-1}=62$ and $4m\;sec^{-1}=25particles\;cm^{-2}$. In the laboratory test, the perfect lethal concentration and dose of Plutella xylostella was chlorfenapyr SC (20 times, $0.5{\mu}l$) and bistrifluron chlorfenapyr SC (25 times, $0.5{\mu}l$). The perfect lethal concentration and dose of Spodoptera exigua was chlorfenapyr SC (20 times, $1{\mu}l$), bistrifluron chlorfenapyr SC (20 times, $1{\mu}l$), and chlorfenapyr SC (20 times, $1{\mu}l$) and bistrifluron chlorfenapyr SC (20 times, $0.5{\mu}l$) for Spodoptera litura. Therefore, the main pest control method of Chinese cabbage using drones is 20 times diluted chlorphenapyr SC or bistrifluoruron-chlorphenapyr SC, sprayed at 3 m height by $3msec^{-1}$ of going speed. This spraying method will be effective for control of Chinese cabbage pest.

농약살포용 드론을 이용한 배추 주요해충 3종의 방제기준 설정

드론을 이용한 배추 해충 방제기준을 설정하기 위하여, 드론의 살포높이(3, 4, 5 m), 진행속도(3, 4 m/sec) 에 따른 하향풍 속도, 살포 폭, 그리고 낙하 입자수와 입자크기를 감수지를 이용하여 조사하였고, 항공방제용 농약 4종을 이용하여 배추 주요해충인 배추좀나방, 파밤나방, 담배거세미나방에 대하여 완전치사농도와 약량을 실험실에서 검정하였다. 드론의 농약 살포시 면별 낙하입자비율은 표면 80.5, 수직면 14.8, 밑면 4.7%였고, 살포높이에 따른 낙하입자수는 3 m = 53, 4 m = 40, 5 m = 39개/$cm^2$였다. 비행속도별 낙하입자수는 3 m/sec = 62, 4 m/sec = 25개/$cm^2$였다. 실내시험에서 배추좀나방의 완전치사농도와 치사량이 클로르페나피르액상수화제(20배, $0.5{\mu}l$) 비스트리플루론 클로르페나피르 액상수화제(25배, $0.5{\mu}l$)였다. 파밤나방에 대하여는 클로르페나피르액상수화제(20배, $1{\mu}l$), 비스트리플루론 클로르페나피르액상수화제(20배, $1{\mu}l$)였고, 담배거세미나방에 대하여는 클로르페나피르액상수화제(20배, $1{\mu}l$), 비스트리플루론 클로르페나피르액상수화제(20배, $0.5{\mu}l$)였다. 따라서 드론을 이용하여 배추 주요해충을 방제하는 방법으로 클로르페나피르액상수화제 또는 비스트리플루론 크로르페나피르액상수화제를 20배액으로 희석하여 3 m 높이에서 3 m/sec 속도로 살포하면 72개/$cm^2$의 농약입자가 낙하하므로 해충방제에 효과적일 것으로 판단된다.