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온도와 접종밀도가 클로버씨스트선충의 증식에 미치는 영향
정문기,이동운,Jeong, Mungi,Lee, Dong Woon 한국응용곤충학회 2019 한국응용곤충학회지 Vol.58 No.1
클로버씨스트선충(Heterodera trifolii)은 우리나라 고랭지에서 배추에 피해를 주는 주요 씨스트선충으로 최근에 분포가 확인되었다. 본 연구는 온도와 접종밀도에 따른 클로버씨스트선충의 증식에 미치는 영향을 알아보기 위하여 수행하였다. $15{\sim}30^{\circ}C$ 온도조건에서 클로버씨스트선충이 증식되었으며 $20^{\circ}C$에서 암컷 성충 수, 알 수, 씨스트 수 모두 가장 많았다. 접종밀도에 따른 클로버씨스트선충의 증식은 접종밀도가 높아질수록 암컷 씨스트선충의 수가 증가하는 경향이었는데 토양 1 g당 16개의 알 처리 시 증식량, 알 수, 씨스트 수 모두 가장 많았다. 암컷 씨스트 수와 알 수는 접종밀도에 상관없이 배추가 케일에 비하여 많이 형성되어 배추가 케일보다 클로버씨스트선충의 증식에 유리한 기주였다. Clover cyst nematode, Heterodera trifolii are one of the major pests that damage Chinese cabbage in high land cultivation area and have recently been distributed in Korea. This study was conducted to investigate the effect of temperature and inoculation density on the proliferation of clover cyst nematode. The clover cyst nematode was proliferated at $15-30^{\circ}C$ and the egg, female adult and cyst number was the highest at $20^{\circ}C$. As the inoculation density increased, the number of female cyst nematodes increased with the inoculation density and when 16 eggs were inoculated per gram of soil, the amount of growth, number of egg and cyst was the highest. Number of females and eggs were formed more in cabbage than in kale regardless of inoculation density. Chinese cabbage was a favorable host for clover cyst nematode growth than kale.
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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.
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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>
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