논 담수 여부에 따른 유기농업자재의 먹노린재 방제 효과
Controlling effect of environmentally friendly organic materials on the black rice bug, Scotinophara lurida (Hemiptera: Pentatomidae), depending on paddy flooding
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초록
벼의 주요 해충인 먹노린재에 대해 실내에서 충체분무법과 기주분무법을 통해 시판 중인 유기농업자재 (EFOM) 27종을 대상으로 살충 활성을 평가하였다. 그 결과, 유기농업자재 7종 (EFOM-8, -10, -12, -13, -19, -20, -26)에서 기주식물에만 살포하는 것보다 충체에 직접 살포되어 접촉하는 경우에만 높은 살충 효과를 보였다. 실내 벼 포트 검정에서는 선발된 7종 모두 담수 조건에서 살충률이 73.3% 이상이었으며, 특히 EFOM-13과 EFOM-20은 퇴수 조건에서보다 담수 조건에서 살충률이 1.5~1.8배 높은 차이를 보였다. 야외 간이 검정에서 EFOM-10 (마늘 80%), EFOM-13 (님 62%), EFOM-26 (고삼 70%+에틸알콜 28%+제충국 2%)는 7일차 담수한 논에서 88.9%의 높은 방제가를 보였고 퇴수한 논보다 방제가는 1.4~1.9배 높았다. 선발된 EFOM-10을 살포한 농가의 담수한 논에서도 7일차 방제가는 86.2%로 퇴수한 논의 방제가 61.9%보다 1.4배 높았다. 종합적으로 살포액의 충분한 충체 접촉과 논의 담수 조건이 유기농업자재의 방제 효과를 높일 수 있음을 보여주었다. 이러한 연구 결과가 앞으로 농가에서 적용할 수 있는 최적의 먹노린재 방제전략 수립에 도움이 되기를 기대한다.
Abstract
The insecticidal activities of 27 different commercial products with environmentally friendly organic material (EFOM) against Scotinophara lurida, a major rice pest, were evaluated in the laboratory using spraying methods on plants and insects. Seven plant-derived organic farming materials (EFOM-8, -10, -12, -13, -19, -20, and -26) with high insecticidal effects when sprayed directly on the insect’s body rather than on the plant were selected. In the indoor rice pot test, all 7 EFOMs showed an insecticidal rate of over 73.3% under irrigated conditions. Notably, EFOM-13 and EFOM-20 demonstrated much higher insecticidal rates, ranging from 1.5 to 1.8 times, in irrigated conditions compared to drained conditions. In the semi-paddy field test, EFOM-10 (80% garlic extract), EFOM-13 (62% neem extract), and EFOM-26 (70% sophora extract+28% ethyl alcohol+2% pyrethrum extract) exhibited a higher control value of 88.9% in the irrigated paddy on the 7th day, surpassing the control values in the drained paddy by 1.4 to 1.9 times. The control value in the irrigated rice paddy field sprayed with EFOM-10 reached 86.2% on the 7th day, which was 1.4 times higher than 61.9% in the drained paddy. Taken together, the findings suggest that direct contact of the insect’s body with sufficient amounts of spray solution and the maintenance of paddy irrigation can enhance the controlling effect of EFOMs. These findings will be valuable in developing an optimal S. luridacontrol strategy for application in rice paddy fields in the near future.
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