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Md. Faisal Kabir,Heebeen Na,In Ho Choi,Yoon Suk Cha,Abraham Okki Mwamula,Young Gyun Kim,Geun Wook Lee,Gyeongman Lee,Kyoung Ae Kim,DongWoon Lee 한국농약과학회 2021 농약과학회지 Vol.25 No.3
The two plant-parasitic nematodes, Helicotylenchus microlobus (spiral nematode) and Mesocriconema nebraskense (ring nematode) widely occur in Korean turfgrass fields. Control and management of these nematodes including other turfgrass nematodes is still at the basic level and therefore, a reliable control strategy is much needed to safeguard the golf courses from plant-parasitic nematodes. In this study, laboratory and field experiments were carried out to test the efficacy of four different nematicides against spiral and ring nematodes. Fluopyram showed a high control efficacy with LC<SUB>50</SUB> of as low as 0.01440 ppm and LC<SUB>90</SUB> of 17.241 ppm after 72 hours of treatment. There was a strong, and moderate linear correlation between the tested doses of abamectin and the corrected mortalities of H. microlobus and M. nebraskense, respectively. However, fosthiazate showed the greatest efficacy among all the tested nematicides in field conditions. This study therefore, suggests that these nematicides could be used in the control of Mesocriconema nebraskense and Helicotylenchus microlobus in turfgrass fields.
Spatial distribution of <i>Heterodera trifolii</i> in Chinese cabbage fields
Kabir, Md. Faisal,Mwamula, Abraham Okki,Lee, Jae-Kook,Jeong, Mungi,Lee, DongWoon,Park, Jung Joon 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol. No.
<P><B>Abstract</B></P> <P>Although <I>Heterodera trifolii</I> is commonly known as the clover cyst nematode, recently the nematode has been identified as a serious menace for Chinese cabbage growers in highland areas in Korea. Soil samples were collected from two Chinese cabbage fields highly infested with <I>H. trifolii</I> in highland areas of Korea, Jungsun and Samcheok, in 2014 and 2015, respectively. A total of 777 (2 × 2 m sampling area) and 414 (5 × 5 m area) soil samples were collected from Jungsun and Samcheok, respectively. The total cysts, cysts with eggs, number of eggs, and empty cysts were calculated for each sample. Distribution patterns for these variables were characterized using spatial analysis by distance indices (SADIE) and variogram model analysis. The aggregation index for cysts with eggs was higher in Jungsun (89.32) than Samcheok (3.63), which indicated that the cyst population density was higher. However, the spatial association of total cysts versus cysts with eggs was higher in Samcheok. The Gaussian model showed reasonable independent range of the nematode in Jungsun and Samcheok to be approximately 53.66 m and 48.54 m, respectively. The model suggested that each nematode sample should be taken at least 50 m apart in the given areas. Inclusion of this distribution pattern may significantly minimize the number of samples in future sampling methods, which could save time and labor, and initiate management practices by elucidating spatial variability factors that influence crop yield.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aggregation pattern of <I>H. trifolii</I> was identified from two highly infested fields. </LI> <LI> Semivariogram analysis predicted the independent data range for both fields. </LI> <LI> Independent range from Gaussian model can minimize future sampling number and time. </LI> <LI> Nematode management can be initiated by elucidating spatial variability factors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Md. Faisal Kabir,이재국,정문기,Mwamula Abraham Okki,최영호,이동운 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.1
Heterodera schachtii is a well-known, destructive pathogen of Chinese cabbage (Brassica rapa pekinensis) in Korea,and several studies have attempted to find a potential control measure against it. This study is the first toinvestigate the effects of varying temperature on the reproduction and damage potential of H. schachtii toChinese cabbage. Chinese cabbage plants were inoculated with H. schachtii at different densities (1, 2, or 4juveniles per gram of soil) and grown under three temperature regimes: constant (15, 20, or 25 °C), increasing(10, 14, and 18 °C), and fluctuating (positive, 16.7–22.0 °C; negative, 21.5–11.5 °C). At a constant temperatureafter 30 days of inoculation, both Chinese cabbage and H. schachtii performed best at 20 °C. However, after60 days of inoculation, H. schachtii had a significantly higher population at 20 °C, whereas cabbage growth wasbest at 25 °C. With increasing temperature, the numbers of cysts and females did not change significantly, andreached maxima at an initial temperature of 14 °C. However, the number of leaves and weights of the Chinesecabbage plants significantly differed at 14 °C. Under fluctuating temperatures, temperature decreases reducedthe H. schachtii population.
Spatial distribution of Heterodera trifolii in Chinese cabbage fields
Md. Faisal Kabir,Abraham Okki Mwamula,이재국,정문기,이동운,박정준 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
Although Heterodera trifolii is commonly known as the clover cyst nematode, recently the nematode has been identified as a serious menace for Chinese cabbage growers in highland areas in Korea. Soil samples were collected from two Chinese cabbage fields highly infested with H. trifolii in highland areas of Korea, Jungsun and Samcheok, in 2014 and 2015, respectively. A total of 777 (2×2m sampling area) and 414 (5×5m area) soil samples were collected from Jungsun and Samcheok, respectively. The total cysts, cysts with eggs, number of eggs, and empty cysts were calculated for each sample. Distribution patterns for these variables were characterized using spatial analysis by distance indices (SADIE) and variogram model analysis. The aggregation index for cysts with eggs was higher in Jungsun (89.32) than Samcheok (3.63), which indicated that the cyst population density was higher. However, the spatial association of total cysts versus cysts with eggs was higher in Samcheok. The Gaussian model showed reasonable independent range of the nematode in Jungsun and Samcheok to be approximately 53.66m and 48.54 m, respectively. The model suggested that each nematode sample should be taken at least 50m apart in the given areas. Inclusion of this distribution pattern may significantly minimize the number of samples in future sampling methods, which could save time and labor, and initiate management practices by elucidating spatial variability factors that influence crop yield.
Md. Faisal Kabir,Abraham Okki Mwamula,Mungi Jeong,Hyun-Gook Kim,Hyeon-Jeong Ahn,Dong Woon Lee 한국원예학회 2019 원예과학기술지 Vol.37 No.3
Field experiments were conducted on a Heterodera trifolii infested Kimchi cabbage field in Jungsun, Korea in 2015 (autumn) and 2016 (spring) to investigate the influence of black and transparent plastic mulch as an approach to suppress the nematode population. Initial and final populations of H. trifolii were compared. Both mulches resulted in different final populations of total cysts, cysts with eggs, and eggs/cyst. In 2015, total cysts and cysts with eggs from transparent plastic mulch were significantly lower compared to black plastic mulch and bare soil. However, eggs/cyst showed no significant differences between both mulches. Furthermore, in 2016, all mulches resulted in decreased final populations. Interestingly, eggs/cyst from both mulches and bare soil were significantly lower than 2015. The study thus demonstrated that all plastic mulches could effectively suppress H. trifolii populations but transparent mulch is more effective.
Kabir Md. Faisal,Mwamula Abraham Okki,DongWoon Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Heterodera trifolii, mostly known as clover cyst nematode, is currently a serious problem for Chinese cabbage growers of the highland area in Korea. Due to lack of readily information about the nematode on Chinese cabbage in Korea, the pest steadily spread within the highland areas and has become a serious setback. Occurrence, spatial aggregation, egg hatching and the pathogenicity of this nematode are depicted in this study from ecological point of view. The study results suggest site-specific control and a potential planting time for the cabbage to avoid severe damage caused by this nematode.
강병훈,Faisal Md. Kabir,배은지,이광수,전병덕,이동운 한국잔디학회 2016 Weed & Turfgrass Science Vol.5 No.4
Aphanisticus congener is a newly recorded buprestid (Coleoptera) insect pest of turfgrass in Korea. This buprestid pest was initially found from turfgrass conservation site in a greenhouse in Jinju, Gyeongnam province, Korea in July, 2014. The Aphanisticus in the family Buprestidae is a leaf miner. A. congener is the close species of A. aeneus which was firstly reported as sugarcane leaf sucker in India. A. congener was active from early July to late August in the greenhouse. Damage by the insect led to drying out and browning of turfgrass leaf because larva fed on cell sap of leaves and adult fed on leaf surface. A. congener damaged Zoysia japonica, Z. sinica, Conodon dactylon, and Poa pratensis when adults were artificially released into potted turfgrasses in the laboratory. In green house, A. congener damaged Z. japonica, Z. macrostachya, Z. matrella, Z. sinica, Conodon dactylon, and hybrid zoysiagrass. However, no damage symptoms were observed from the same turfgrass accessions in the nearby field of the greenhouse. Thus, the new coleopteran pest may be a warm-adapted pest for turfgrass, damaging turfgrass leaf only in warmer conditions.