Spatial Distribution of Pasteuria nishizawae Attacking Heterodera glycines

콩씨스트선충 기생세균 Pasteuria nishizawae의 토양내 분포

  • Published : 1998.12.01

Abstract

Spatial distribution in soil and seasonal population changes of Pasteuria nishizawae first found in Korea from soybean cyst nematode were studied. P. nishizawae infested in 61% of areas in a soybean field; in an average, about 0.3% of 46 cysts and 17.6% of 9 juveniles per 100 g soil were infested with the bacterium. The highest percentages of spore-attached nematodes were found in July (75%) and between soil depth of 11~20 cm. The number of spores per juvenile was positively correlated with the percentage of juveniles with spores (r=0.4203; P<0.0133), but negatively correlated with the number of juveniles in soil (r=-0.3499; P<0.042). P. nishizawae completed its life cycle in cyst and produced 1.7$\times$105 spores per cyst.

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