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Sushant Raj Sharma,Lucas Mezione de Carvalho,Ji-Youn Lee,Kyeong-Yeoll Lee 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The fall armyworm (FAW), Spodoptera frugiperda, is an invasive pest species in Africa and Asia, which is native to the Western hemisphere. Invaded FAW was corn feeding strain. We study the developmental and biology of the corn strain FAW on the rice plants compare the result with corn feeding up to F2- generation. The development periods of F0, F1 and F2 generations of the rice-fed colony were 21.7%, 18.3% and 18.9% longer than corn-fed colony. The rice-fed colony was significantly lower in the body weight of larvae and pupae, and pre-adult survival rate and the fecundity than corn-fed colony. Our results showed that the corn strain FAW can survive and complete its life cycle by feeding rice plants up to several generations under laboratory condition, but their development and fecundity were reduced in comparison to the corn feeding colony. However, this study suggests potential impact of invaded FAW to the infestation of rice fields in Asian countries.
Sharma Sushant Raj,Jae-Kyoung Shim,Bong-gi Choi,Shafeeq Tahir,Kyeong-Yeoll Lee 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Bemisia tabaci is a serious pest in various horticultural crops in the world. Due to use of chemical pesticide for their management they develop pesticide resistance and environmental contamination. It is necessary to develop alternative bio-pesticides using natural products from plants and natural enemies. Nicotiana benthamiana is a variety of wild tobacco plants and produce acyl sugars from glandular trichomes in the leaves. When adult whiteflies were reared with fresh N. benthamiana leaves, they were completely dead within 84 h. Oral feeding of 20% N. benthamiana extracts using ethanol and water showed complete mortality of whiteflies within 48 hours. Spray of N. benthamiana extracts into the leaves was lethal to eggs but not to nymphs of whiteflies. Further, tomato plants sprayed with N. benthamiana extracts were highly repellent to adult whiteflies. Quantitative real-time PCR indicated that the expression of various genes of B. tabaci was changed by oral feeding of N. benthamiana extract. This study suggests N. benthamiana extract is a useful for the control of whiteflies and can be used as an alternative natural pesticide for the whitefly management.
Sharma Sushant Raj,Jae-Kyeong Shim,Kyeong-Yeoll Lee,Kyeong-Yeoll Lee 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Bemisia tabaci is a serious pest in various horticultural crops in the world. The management of B. tabaci has been typically carried out by chemical pesticides. Due to the development of pesticide resistance and environmental contamination, however, it is necessary to develop alternative biopesticides using natural products from plants and natural enemies. Nicotiana benthamiana is a variety of wild tobacco plants and produce acyl sugars from glandular trichomes in the leaves. Acyl sugars are known to be highly toxic to various plant sapping insects such as whiteflies, aphids and thrips. Here, we extracted acyl sugars in two different ways from the leaves. At first, collected leaves were simply washed with water. Otherwise, collected leaves firstly dried and homogenized into the powder, then extracted with ethanol. Spray of 10% water-extracted solution into adult whiteflies showed 80% mortality. Otherwise, spray of 10% ethanol-extracted solutions showed complete mortality at 48 h after treatment and also strong repellency of adult whiteflies into the treated tomato plants. Our results suggest N. benthamiana is a useful for the control of whiteflies and can be used as an alternative natural pesticide for the whitefly management.
Genetic diversity and geographic distribution of Bemisia tabaci species complex in Nepal
Acharya Rajendra,Kumar Shrestha Yam,Raj Sharma Sushant,이경열 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Bemisia tabaci species complex comprises at least 44 cryptic species worldwide. Here, we analyze the nucleotide sequences of mitochondrial cytochrome oxidase subunit 1 (COI) gene obtained from 76 samples of B. tabaci collected from 23 districts in Nepal. This is the first genetic and geographic study of B. tabaci species complex in Nepal. Our phylogenetic study identified the presence of three cryptic species—Asia I, Asia II 1, and Asia II 5—with high interspecific but low intraspecific variations. Among the three cryptic species, Asia II 5 was the most prevalent in Nepal, constituting 64.47% of all the sequenced samples. Based on haplotype network analysis of COI sequences, Asia II 1 was more genetically diversified than the other two cryptic species. Our results provided useful information on the genetic diversity and geographic distribution of B. tabaci in Nepal, which help monitor population changes of B. tabaci at cryptic species level and develop sustainable management strategies for its control.