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Hwal-Su Hwang,Duck-Oung Jung,Jin-Won Kim,Kyeong-Yeoll Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
Aphidius colemani has been used as commercially available natural enemies for the aphid control. However, some siblingspecies are difficult to distinguish their morphology even though they have different parasitic characteristics. Recentlywe identified overwintering parasitoids inside the aphid mummies at the pepper greenhouse in Yecheon. The nucleotidesequence analysis identified as A. transcaspicus which is morphologically similar with A. colemani. Those genetic differencesof COI and ITS2 sequences were 4.36-4.84% and 2.65-5.84%, respectively. While A. colemani is useful for the controlof Aphis gossypii and Myzus persicae, A. transcaspicus parasitize various species belongs to the genera Hyalopterus, Melanaphisand Rhopalosiphum. Thus, precise diagnosis of natural enemies is required for the successful pest control.
Hwang, Hwal-Su,Jung, Duck-Oung,Kim, Jin-Won,Lee, Kyeong-Yeoll 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.2 No.1
<P><B>Abstract</B></P> <P> <I>Aphidius colemani</I> (Braconidae: Aphidiinae) is an endoparasitoid and one of the most commercially used parasitoids for the control of various pest aphids. However, species identification of <I>A. colemani</I> is difficult because of the high degree of morphological similarity with closely associated species, such as <I>A. transcaspicus</I> and <I>A. platensis</I>. Recently, we identified a large-scale emergence of parasitoids from mummies of <I>Rhopalosiphum maidis</I> on barley banker plants in Yecheon County, Korea. The morphological characteristics of the forewing, petiole, and antenna indicated that our specimen is <I>A. transcaspicus.</I> The partial nucleotide sequence analysis of the mitochondrial cytochrome oxidase subunit I (COI) gene showed that it is 100% identical to Japanese specimens and 1.69% variable to Greek specimens<I>.</I> Analysis of the phylogenetic tree, haplotypes, and amino acid sequence of the COI gene, as well as the internal transcribed spacer 2 (ITS2) of the nuclear ribosomal DNA region, indicated that <I>A. transcaspicus</I> is closer to <I>A. platensis</I> than <I>A. colemani,</I> and Korean and Japanese populations were mostly diversified groups at the intraspecific level. This study provides important information to elucidate the genetic variation in <I>A. transcaspicus</I> and the relationships between closely related species within the <I>A. colemani</I> group.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Aphidius transcaspicus</I> was firstly identified in Korea. </LI> <LI> <I>transcaspicus</I> was genetically close to <I>A. platensis</I> and <I>A. colemani</I>. </LI> <LI> <I>transcaspicus</I> was morphologically and genetically closer to <I>A. platensis</I> than <I>A. colemani.</I> </LI> <LI> Potential aphid control efficacy was discussed among three species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Survey of aphid parasitoids in Ulleungdo and Dokdo islands
Hwal-Su Hwang,Duck-Oung Jung,Kyeong-Yeoll Lee 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Parasitic wasps are a good source of natural enemies for pest control. Due to the presence of unique biodiversity in Ulleungdo and Dokdo Islands, we surveyed aphid parasitoids in these two islands. We collected aphids and their mummies then identified emerged wasps in both morphological and molecular ways. We found 6 species of aphid parasitoids belongs to Aphelinidae and Braconidae. Two species of the genus Aphelinus belongs to Aphelinidae were emerged from Aphis nasturtii and Macrosiphoniella formosatemisiae. Three species of the genus Aphidius belongs to Braconidae were emerged from Ahpis rumicis, M. formosatemisiae and Capitophorus elaeagni. One species of the genus Lysiphlebia belongs to Braconidae was emerged from Aphis gossypii, Molecular analysis provided genetic informations for species diagnosis of parasitoids. We also analyzed genetic and ecological informations of identified parasitoids to evaluate potential source of natural enemies.
Simple mass rearing of Neoseiulus californicus and practical application to strawberry farms
Hwal-Su Hwang,Duck-Oung Jung,Kyeong-Yeoll Lee 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
사막이리응애(Neoseiulus californicus)는 칠레이리응애에 비하여 고온건조한 조건에서 유리하고 점박이응 애, 차응애, 차먼지응애 등 응애류 뿐만 아니라 가루이, 총채벌레 등 다양한 미소해충을 포식 포식하는 광식성 천적으로서 전세계적으로 산업화되고 있다. 사막이리응애를 농가수준에서 증식하기 위하여 간단한 대량생산 방법을 개발하였다. 천적의 먹이원인 가는다리고기진드기와 배지로서 밀기울(70%) 및 팽창질석(30%)을 멸균 팩에 넣고 사막이리응애를 사육하였다. 그 결과 사막이리응애의 밀도는 3주차에 18배로 증식되었다. 증식된 사막이리응애를 딸기 농장에 2월초부터 4월초까지 8주간 매주 투여한 결과 잎당 점박이응애의 밀도는 무처리구 에서 41.5마리이고 천적처리구는 7.0마리로서 점박이응애 방제효과가 83%로 나타났다. 본 연구를 통하여 자가 생산한 사막이리응애를 활용하여 딸기농가의 점박이응애 방제에 효과적으로 사용할 수 있을 것으로 판단된다.