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Screening of Nematode Extraction Papers for Baermann Funnel Method
Heonil Kang,Jaehyun Lee,Insoo Choi,Donggeun Kim 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
The Baermann funnel method requires three to four Kimwipes tissues for clean nematode extraction. To find more efficient and economical nematode extraction paper, 14 different kinds of tissue papers were tested and compared with Kimwipes tissues. Nematode species used in the extraction efficiency test were juvenile (J2) of Heterodera spp., J2 of Meloidogyne spp., Pratylenchus spp., Rhabditis spp., Acrobeloides spp., Panagrolaimus spp., Poikilolaimus spp. and Diplogasterida. Extraction efficiency varied between 42.0 to 88.8%. Considering costs, extraction efficacy, and cleanness, one sheet of Pulling Kitchen Towel (MONALISA Co., Korea) is selected.
First report of five free-living nematode species(Nematoda: Rhabditida) from Korea
Kang, Heonil,Seo, Jongmin,Kim, Donggeun,Bae, Changhwan,Kim, Yongchul,Choi, Insoo The National Institute of Biological Resources 2019 Journal of species research Vol.8 No.3
Five free-living nematode species belonging to the order of Rhabditida are described for the first time in Korea. Two unrecorded species of Rhabditidae, Cruznema tripartitum (Linston, 1906) Zullini, 1982, and Poikilolaimus oxycerca de Man, 1895, and one species of Peloderidae, Pelodera strongyloides Schneider, 1860, were collected in Korea. C. tripartitum has nine pairs of genital papillae arranged in 2+2+1+4 differently from similar species of C. scarabaeum which has ten genital papillae arranged in 2+1+4+3. Poikilolaimus oxycerca has shorter tail (shorter than anal body diameter) compared to similar species of P. regenfussi which has longer tail(longer than anal body diameter). Pelodera strongyloides has shorter tail(1-1.5 times anal body diameters long) than P. punctata (4 anal body diameters long). Two unrecorded species of Panagrolaimidae, Panagrolaimus apicatus Schuurmans Stekhoven & Teunissen, 1938 and Panagrolaimus rigidus (Schneider, 1866) Thorne, 1937 were collected in Korea. P. apicatus has rounded and lower lip compared to similar species, P. margaretae Massey, 1964 which has finely pointed lip. P. rigidus has slender tail and lips rounded and flat barely separated when compared to similar species, P. subelongatus(Cobb, 1914) Thorne, 1937 which has plumper tail and lips are well separated.
Molecular Biological Analysis for the Identification of Meloidogyne Species on Strawberry in Korea
Heonil Kang,Namsook Park,Donggeun Kim,Insoo Choi 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
This study is the identification of root-knot nematode (RKN), Meloidogyne hapla, from strawberry in Korea using molecular analyses. Strawberry plants showed localized stunting and galled roots. Molecular analyses of COⅡ/lrRNA, 28S rDNA D2-D3 segment and internal transcribed spacer (ITS) region were employed for the identification of Meloidogyne spp. Polymerase Chain Reaction (PCR) amplification of COⅡ/lrRNA region produced a single fragment ca 528bp. Restriction digestion of the amplified PCR products with Dra1 enzyme produced two fragments at 200 and 250bp indication M. hapla. 28S rDNA D2-D3 segment and ITS were cloned and sequenced. 28S rDNA D2-D3 segment and ITS region produced a single fragment of 1004bp and 560bp, respectively. In BLAST search in Genbank, all sequences accord with other known M. hapla. As a result, all of the RKN samples were M. hapla. This study suggests that the dominant species of RKN on strawberry is M. hapla in Korea.
Kang, Heonil,Eun, Geun,Ha, Jihye,Kim, Yongchul,Choi, Insoo,Kim, Donggeun The National Institute of Biological Resources 2016 Journal of species research Vol.5 No.3
Hemicycliophora litoralis is newly collected from Korea. Korean population is well matched and within a range of original description and additional record from Solomon island in de Man's of L, b, c, V, R, Rex, Ran, Roes, RV (ant), annule, excretory pore, stylet length, and tail length. Differences are observed in RV and RVan. RV and RVan of original description was 55 (48-69) and 14 (10-19) but Korean population is 68 (61-76) and 22 (19-24), respectively. H. litoralis described from Solomon island has RVan of 19.6 (17-23) and is similar to Korean population. H. litoralis from Solomon island has slight higher Rst value of 39 (35-59) compared to Korean population of 33.5 (29-38). The measurements of MB (%), s, G1, G2 values are newly given.
Occurrence and Distribution of Root-Knot Nematodes in Kiwifruit Orchard
Kang Heonil,Je Hwanseok,Choi Insoo 한국식물병리학회 2023 식물병연구 Vol.29 No.1
The study was conducted to investigate the infestation and distribution of plant-parasitic nematodes on kiwi orchards in Korea. Plant parasitic nematodes genus and densities were investigated at a total of 102 sites in Jeollanam-do, Gyeongsangnam-do, and Jeju-do, which are the main production areas of domestic kiwi orchards. Plant parasitic nematodes detected were of 9 genera, including root-knot nematodes (Meloidogyne spp.), spiral nematodes (Helicotylenchus spp.), and needle nematodes (Paratylenchus spp.), and 56% of the 102 plantations were infected with root-knot nematodes. Root-knot nematodes were found to be the most important plant parasitic nematode in domestic kiwi orchards. The average density of root-knot nematodes is 97 per 300 cm<sup>3</sup> soil, and there is concern about the kiwi yield reduction. As a result of identifying the root-knot nematode species: M. arenaria, M. hapla, M. incognita, and M. javanica. Among them, M. arenaria is the most dominant. As the plant parasitic nematode infection route in fruit trees is often spread through the transplantation of infected seedlings, attention should be paid to the production of nematode-free plants during the production and supply of kiwifruit plants.
Nematicidal Activities of Pesticides against Root-Lesion Nematode in Perilla frutescens
Heonil Kang,Hyoung-Rai Ko,Sekeun Park,Eunhyeong Park,Eunwha Kim,Byeong-Yong Park 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
Perilla (Perilla frutescens (L.) Britton var. japonica), which is an annual herbaceous crop belonging to Lamiaceae family, is one of the most important crop in Korea. Its seeds have been used for cooking oil and seasoning dishes. And its fresh leaves have been directly consumed. Plant parasitic nematodes were detected in perilla cultivation fields in Korea, and the incidences of root-lesion nematodes (RLNs) were higher than other plant parasitic nematodes. Among the RLNs, Pratylenchus penetrans was widely distributed and causes chlorosis of the leaf, necrosis of the root and yield loss on perilla. This study was conducted to test the nematicidal activities to P. penetrans for control. Six pesticides, which are amisulbrom, cadusafos, imicyafos, fluazinam, fluopyram, and fosthiazate, showed activities of 27.5% to 100% in well plate. Four pesticides showed the higher nematicidal activity than other in vitro tested pesticides; 100% mortality of fluopyram, 97.7% of cadusafos, 84.6% of imicyafos and 83.2% of fosthiazate. In greenhouse pots, fluopyram, cadusafos, and imicyafos caused the greatest inhibition of reproduction of P. penetrans, with decreases of 100%, 98.8% and 98.6%, respectively. Interestingly, fluopyram treatment was indicated 100% nematicidal activity from in vitro and pot experiment. Thus, our results suggest that fluopyram could be used to control the P. penetrans in perilla cultivation fields.