【摘要】 Sfeinernema sp. (CB-2y)是1986年从河北省一苹果园土样中分离获得的昆虫病原线虫。室内试验表明,它在15-30℃下能侵染害虫,并在其体内繁殖,离体培养的最适温度为20-25℃。在含水量10-17.5％的沙壤中,线虫具有侵染力。含水最低于7.5％时,虽能存活,但不能侵染害虫。在2.5％含水量沙壤中,则不能存活。CB-2y线虫能在北京地区越冬,在25-30厘米深层土中,越冬存活率为47.8％。该线虫垂直扩散能力强,3天内在沙中57％的线虫已扩散到5厘米以远,最远距离可达30厘米。在23℃含水量14.5％的沙壤中,16周后CB-2y仍能保持侵染力,而S. feltiae Agriotos的侵染力只能保持4周。更多还原

【Abstract】 Steinernema sp. (isolation No.CB-2Y) was isolated from the soil of an apple orchard in Hebei Province in 1986. laboratory experiments demonstrated that CB-2Y could infect its insect host and reproduce under 15-30℃. The optimal temperature for its in-vitro propagation was found to be 20-25℃. the nematode remained its infectivity in sandy soils with 10-17% water content. In the soils with less than 7.5% water content, the nematode could survive without infectivity. It died when the soil water content was below 2.5%. CB-2Y maintained infectivity for 16 weeks in sandy loam with 14.5% water content at 23℃, while Steinernema feltiae agriotos only kept its infectivity for 4 weeks under the same condition. The new nematode strain also showed a strong vertical dispersal ability, 57% of the experimental population dispersed to 5 cm deep in the sandy soil in 3 days, with the maximum dispersal distance of 30 cm. Results of the ou.tdoor experiments showed that CB-2Y could overwinter in Beijing area. In the soil of 25-30 cm deep, the overwintering survival rate was found to be 47.8% after 4 months.更多还原