[논문]Relationship between the Population of Ralstonia solanacearum in Soil and the Incidence of Bacterial Wilt in the Naturally Infested Tobacco Fields

Chung, Yun-Hwa; Yu, Yun-Hyun; Kang, Yue-Gyu

doi:10.5423/ppj.2004.20.4.289

Relationship between the Population of Ralstonia solanacearum in Soil and the Incidence of Bacterial Wilt in the Naturally Infested Tobacco Fields 원문보기

The plant pathology journal, v.20 no.4, 2004년, pp.289 - 292

Chung, Yun-Hwa (Agro-Tech Research Group, KT&G Central Research Institute) , Yu, Yun-Hyun (Agro-Tech Research Group, KT&G Central Research Institute) , Kang, Yue-Gyu (Agro-Tech Research Group, KT&G Central Research Institute)

Abstract ▼ AI-Helper

The population of Ralstonia solanacearum (Rs) in soil is very important as a primary inoculum source of bacterial wilt in tobacco fields. To investigate the population of Rs, physical properties and chemical components during the tobacco growing season, soil samples were taken from the fifteen fields which were located in the flue-cured tobacco growing area, Ansung, Kyunggi province and Wonju, Kangwon province. Two fields of the fifteen were bacterial wilt free. Six fields had less than 10% plants being diseased and seven over 10%. The Rs population level determined by using SMSA medium generally showed an up-and-down pattern being low in May, high in Jun and July and low in August. The soil population in May and June showed a positive correlation with the incidence of bacterial wilt (r=0.571$^*$, r=0.688$^{**}$), but P$_2O_5$, content of soil was negatively correlated with the disease incidence (r=-0.539$^*$). These results suggest that Rs population in soil examined in May or in June, and the P$_2O_5$ content in soil should be key factors to determine the bacterial wilt potential of tobacco fields.

주제어

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문제 정의

The aim of this study was to evaluate the influence of naturally infested soil population of R solanacearum on the severity of bacterial wilt in relation to physical properties and chemical components of the tobacco field soil.

제안 방법

More detailed study is required for explaining clearly the reason. Improving selective media and a method for measuring Rs population present low in soil, Rs population from soil will give us key information to estimate the bacterial wilt potential of the fields.

대상 데이터

Selection of flelds surveyed and sampling field soil. For the research, fifteen commercial tobacco fields in the flue-cured tobacco growing area of Korea, 6 fields in Samjuckmyon Ansung of Kyunggi province and 9 fields in Buronmyeon Wbiiju of Kangwon province, were selected. We classified them on the basis of the rate of wilt disease incidence: 5 fields below 5% of incidence, 5 fields1 5 to 20% and 5 fields over 21%, respectively.
We classified them on the basis of the rate of wilt disease incidence: 5 fields below 5% of incidence, 5 fields1 5 to 20% and 5 fields over 21%, respectively. Soil samples were taken about 1 kg at 5 m interval to the depth of 5-15 cm at 5 randomly chosen sites within 2-4 lows located at the center of the tobacco planted fields. The collected soil samples from same field were mixed well and each vinyl bag (25 x 30 cm) contained 2 kg mixed soil was made.

성능/효과

Relationship between soil properties and bacterial wilt incidence was shown that soil phosphate (P₂O₅) content was negatively correlated with the disease incidence (r=-539*) (Table 4).

참고문헌 (18)

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