• Journal of Microbiology
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• 제43권5호
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• pp.463-468
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• 2005

Studying the bacteria of hazardous insects allows the opportunity to find potentially better biological control agents. Therefore, in this study, bacteria from summer chafer (Amphimallon solstitiale L., Coleoptera: Scarabaeidae) we isolated and identified the insecticidal effects of bacteria isolated from A. solstitiale and Melolontha melolontha L. (common cockchafer, Coleoptera: Scarabaeidae) and the mixtures of these bacterial isolates were investigated on A. solstitiale larvae. Crystals from Bacillus sp. isolated from M. melolontha were also purified, and tested against the second and third-stage larvae of A. solstitiale. The bacterial isolates of A. solstitiale were identified as Pseudomonas sp., Pseudomonas sp., Bacillus cereus and Micrococcus luteus, based on their morphology, spore formation, nutritional features, and physiological and biochemical characteristics. The insecticidal effects of the bacterial isolates determined on the larvae of A. solstitiale were $90\%$ with B. cereus isolated from A. solstitiale, and $75\%$ with B. cereus, B. sphaericus and B. thuringiensis isolated from M. melolontha within ten days. The highest insecticidal effects of the mixed infections on the larvae of A. solstitiale were $100\%$ both with B. cereus+B. sphaericus and with B. cereus+B. thuringiensis. In the crystal protein bioassays, the highest insecticidal effect was $65\%$ with crystals of B. thuringiensis and B. sphaericus isolated from M. melolontha within seven days. Finally, our results showed that the mixed infections could be utilized as microbial control agents, as they have a $100\%$ insecticidal effect on the larvae of A. solstitiale.

• Mycobiology
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• 제48권2호
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• pp.139-147
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• 2020

Root-feeding Scarabaeidae, particularly white grubs are considered among the most harmful coleopteran insect pests in turfgrass. In this work, sixteen entomopathogenic fungal species were assayed against flower chafer beetle, Protaetia brevitarsis (Coleoptera: Scarabaeidae) and Metarhizium anisopliae JEF-314 showed high virulence. The control ability of the isolate JEF-314 has been in detail tested for a model insect flower chafer beetle. Further analyses showed insect stage-dependent virulence where the fungal virulence was the highest against smaller instar larvae. Additionally, we confirmed that millet-based solid cultured granule was effective against the soil-dwelling larval stage. The isolate also showed a similar ability for a representative pest (Popillia spp.) in laboratory conditions. Our results clearly suggest a high potential of M. anisopliae JEF-314 to control the flower chafer beetle, possibly resulting in controlling of root-feeding white grubs in turfgrass. Based on the insect life cycle and susceptibility to the fungus, late spring and summer time would be the optimum time to apply JEF-314 granules for an effective control. Further characterization of the efficacy of the fungus under field conditions against the Scarabaeidae beetles might provide an efficient tool to control this beetle in an environment-friendly way.

• 한국응용곤충학회지
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• 제41권3호
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• pp.217-223
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• 2002

주둥무늬차색풍뎅이는 성충이 각종 활엽수의 잎을 가해하여 피해를 주는 해충이지만 유충에 의한 피해도 벤트그라스에서 기록되어 있다. 그러나 진주골프장의 퍼레니얼라이그라스에서 7월에 잔디가 황화 현상을 보이면서 시들음 증상이 나타나 조사한 결과, 주둥무의차색풍뎅이 유충에 의한 피해로 확인되었다. 피해는 한지형 잔디의 하고현상과 비슷하나 관수 후에도 잔디의 활력이 회복되지 않고, 부분적으로 고사가 일어나는 차이를 보였다. 한편, 주둥무의차색풍뎅이 유충의 환경친화적 방제를 위하여 한국산 곤충병원성 선충의 효과를 실험실과 골프장에서 수행하였다. 실험실내에서 주둥무의차색풍뎅이 3령충은 Heterorhabditis bacteriophora 제주 strain과 Hererorhabditis sp. 경산 strain, Steinernema carpocapsae 포천 strain, S.glaseri 동래 strain, S.longicaudum 논산 strain 중 H.bacteriophora 제주 strain과 Heterorhubditis sp. 경산 strain에 의한 치사율이 95%로 가장 높았다. 골프장 fairway에서의 야외실험에서는 H. bacreriophora제주 strain과 Heterorhabditis sp. 경산 strain, S.carpocapsae 포천 strain에 의한 유충 감소율이 28-57%로 다양하였다.