곤충병원성 선충은 중요한 천적자원으로서 다양한 해충의 방제효과가 알려져 있다. 본 연구에서는 주요 작물 해충인 작은뿌리파리 (Bradysia impatiens)와 담배거세미나방(Spodoptera litura Fabricius)를 대상으로 곤충병원성 선충 4종(Heterorhabditis bacteriophora, H. indica, Steinernema carpocapsae, S. longicaudum)과 포식성 응애 2종(Androlaelaps casalis, Stratiolaelaps scimitus)의 살충효과를 사망률, 유충 침투율, 생식률로 분석하였다. 병원성 선충은 ...
곤충병원성 선충은 중요한 천적자원으로서 다양한 해충의 방제효과가 알려져 있다. 본 연구에서는 주요 작물 해충인 작은뿌리파리 (Bradysia impatiens)와 담배거세미나방(Spodoptera litura Fabricius)를 대상으로 곤충병원성 선충 4종(Heterorhabditis bacteriophora, H. indica, Steinernema carpocapsae, S. longicaudum)과 포식성 응애 2종(Androlaelaps casalis, Stratiolaelaps scimitus)의 살충효과를 사망률, 유충 침투율, 생식률로 분석하였다. 병원성 선충은 작은뿌리파리의 노숙유충에게 효과적이였고 H. indica가 S. carpocapsae보다 효과적이였다. 대조적으로 포식성 응애는 어린유충에게 효과적이였으며 S. scimitus가 A. casalis보다 효과적이였다. 또한 병원성 선충과 포식성 응애를 동시에 이용할 경우 H. indica와 S. scimitus를 혼용하였을때 살충률이 가장 높았다. 담배거세미나방에 관하여 4종류의 병원성 선충 모두 노숙 유충보다 어린 유충에게 더 효과적이었다. 또한, 사망률, 유충 침투율, 생식률 3가지를 비교하였을때, H. Indica, S. carpocapsae, S. longicaudum가 H. bacteriophora보다 효과적이였다. 즉, 곤충병원성 선충의 살충효능은 종마다 다양하게 나타났으며 포식성응애와 혼용시에 상승작용을 나타냈다. 본 연구를 통하여 천적을 활용한 효과적인 해충방제에 기여할 수 있을 것으로 판단한다.
곤충병원성 선충은 중요한 천적자원으로서 다양한 해충의 방제효과가 알려져 있다. 본 연구에서는 주요 작물 해충인 작은뿌리파리 (Bradysia impatiens)와 담배거세미나방(Spodoptera litura Fabricius)를 대상으로 곤충병원성 선충 4종(Heterorhabditis bacteriophora, H. indica, Steinernema carpocapsae, S. longicaudum)과 포식성 응애 2종(Androlaelaps casalis, Stratiolaelaps scimitus)의 살충효과를 사망률, 유충 침투율, 생식률로 분석하였다. 병원성 선충은 작은뿌리파리의 노숙유충에게 효과적이였고 H. indica가 S. carpocapsae보다 효과적이였다. 대조적으로 포식성 응애는 어린유충에게 효과적이였으며 S. scimitus가 A. casalis보다 효과적이였다. 또한 병원성 선충과 포식성 응애를 동시에 이용할 경우 H. indica와 S. scimitus를 혼용하였을때 살충률이 가장 높았다. 담배거세미나방에 관하여 4종류의 병원성 선충 모두 노숙 유충보다 어린 유충에게 더 효과적이었다. 또한, 사망률, 유충 침투율, 생식률 3가지를 비교하였을때, H. Indica, S. carpocapsae, S. longicaudum가 H. bacteriophora보다 효과적이였다. 즉, 곤충병원성 선충의 살충효능은 종마다 다양하게 나타났으며 포식성응애와 혼용시에 상승작용을 나타냈다. 본 연구를 통하여 천적을 활용한 효과적인 해충방제에 기여할 수 있을 것으로 판단한다.
Fungus gnat, Bradysia impatiens is a serious soil pest of seedlings of various crops in the greenhouse and also in mushroom nurseries where as Spodoptera litura Fabricius is the serious, polyphagous pest which damage on the upper part of plant particularly on leaves and inflorescences of various cro...
Fungus gnat, Bradysia impatiens is a serious soil pest of seedlings of various crops in the greenhouse and also in mushroom nurseries where as Spodoptera litura Fabricius is the serious, polyphagous pest which damage on the upper part of plant particularly on leaves and inflorescences of various crops. Control with chemical pesticides may not be suitable for both insects because B. impatiens infestation mostly occurs indoor and S. litura is mostly resistant to the common insecticides. In B. impatiens, I determined the control efficacy of two biological agents: entomopathogenic nematodes (EPNs) and predatory mites, and investigated whether the combined treatments of these two agents improved the control efficacy of B. impatiens. Mortalities of various stages of B. impatiens maggots were determined in single treatments of two species of EPNs, Heterorhabditis indica and Steinernema carpocapsae, and two species of predatory mites, Androlaelaps casalis and Stratiolaelaps scimitus. EPNs were more effective in controlling the older larvae of B. impatiens and the effect was higher with H. indica than with S. carpocapsae. Predatory mites were more effective in controlling the younger larvae of B. impatiens and the effect was higher with S. scimitus than with A. casalis. Furthermore, the control efficacy using H. indica was increased in combination with S. scimitus but not with A. casalis, when compared with the single treatments. Therefore, the combination of H. indica and S. scimitus can be used to improve the control efficacy of B. impatiens. In Spodoptera litura, I compared the virulence of four EPNs, Heterorhabditis bacteriophora, H. indica, Steinernema carpocapsae, and S. longicaudum against each larval stage of S. litura. All EPNs caused more lethality among younger larvae than among older larvae. Mortality at all larval stages was proportional to exposure time and density of EPNs. Comparison of four EPNs showed that H. indica, S. carpocapsae, and S. longicaudum were associated with higher mortality, penetration rate, and reproduction rate than H. bacteriophora. These EPNs were also highly effective in controlling S. litura in a pot assay. Here, the results indicate that H. indica, S. carpocapsae, and S. longicaudum can be used as efficient biological control agents against S. litura.
Fungus gnat, Bradysia impatiens is a serious soil pest of seedlings of various crops in the greenhouse and also in mushroom nurseries where as Spodoptera litura Fabricius is the serious, polyphagous pest which damage on the upper part of plant particularly on leaves and inflorescences of various crops. Control with chemical pesticides may not be suitable for both insects because B. impatiens infestation mostly occurs indoor and S. litura is mostly resistant to the common insecticides. In B. impatiens, I determined the control efficacy of two biological agents: entomopathogenic nematodes (EPNs) and predatory mites, and investigated whether the combined treatments of these two agents improved the control efficacy of B. impatiens. Mortalities of various stages of B. impatiens maggots were determined in single treatments of two species of EPNs, Heterorhabditis indica and Steinernema carpocapsae, and two species of predatory mites, Androlaelaps casalis and Stratiolaelaps scimitus. EPNs were more effective in controlling the older larvae of B. impatiens and the effect was higher with H. indica than with S. carpocapsae. Predatory mites were more effective in controlling the younger larvae of B. impatiens and the effect was higher with S. scimitus than with A. casalis. Furthermore, the control efficacy using H. indica was increased in combination with S. scimitus but not with A. casalis, when compared with the single treatments. Therefore, the combination of H. indica and S. scimitus can be used to improve the control efficacy of B. impatiens. In Spodoptera litura, I compared the virulence of four EPNs, Heterorhabditis bacteriophora, H. indica, Steinernema carpocapsae, and S. longicaudum against each larval stage of S. litura. All EPNs caused more lethality among younger larvae than among older larvae. Mortality at all larval stages was proportional to exposure time and density of EPNs. Comparison of four EPNs showed that H. indica, S. carpocapsae, and S. longicaudum were associated with higher mortality, penetration rate, and reproduction rate than H. bacteriophora. These EPNs were also highly effective in controlling S. litura in a pot assay. Here, the results indicate that H. indica, S. carpocapsae, and S. longicaudum can be used as efficient biological control agents against S. litura.
주제어
#biological control entomopathogenic nematodes predatory mites fungus gnat tobacco cutworm
학위논문 정보
저자
Acharya, Rajendra
학위수여기관
경북대학교 대학원
학위구분
국내석사
학과
응용생명과학부
발행연도
2019
총페이지
vi, 44 p.
키워드
biological control entomopathogenic nematodes predatory mites fungus gnat tobacco cutworm
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