Griffin G D, Jensen K B
J Nematol. 1997 Mar;29(1):82-9.
The invasion by three different Utah populations of Pratylenchus neglectus (UTI, UT2, UT3) was similar in single and interplantings of 'Lahontan' alfalfa and 'Fairway' crested wheatgrass at 24 ñ 3 degrees C. Population UT3 was more pathogenic than UT1 and UT2 on both alfalfa and crested wheatgrass. Inoculum density was positively correlated with an invasion by P. neglectus. Invasions by UT3 at all initial populations (Pi) exceeded that of UT1 and UT2 for both single and interplanted treatments. The greatest reductions in shoot and root weights of alfalfa and crested wheatgrass were at a Pi of 8 P. neglectus/cm(3) soil. Pi was negatively correlated with alfalfa and crested wheatgrass shoot and root growth and nematode reproduction. The reproductive factor (Rf) for UT3 exceeded that of UT1 and UT2 in single and interplantings at all inoculum levels. There were no differences in Rfin the Utah populations in single or interplantings. A nematode invasion increased with temperature and was greatest at 30 degrees C. Population UT3 was more pathogenic than UT1 and UT2 and reduced shoot and root growth at all soil temperatures. Populations UT1 and UT2 reduced shoot and root growth at 20-30 degrees C. Soil temperature was negatively correlated with shoot and root growth and positively correlated with nematode reproduction. Reproduction of UT3 exceeded that of UT1 and UT2 at all soil temperatures.
在24±3摄氏度的条件下，三种不同的犹他州苜蓿短体线虫种群（UTI、UT2、UT3）对‘拉洪坦’苜蓿和‘球道’扁穗冰草单播和间作的侵染情况相似。种群UT3对苜蓿和扁穗冰草的致病性均强于UT1和UT2。接种密度与苜蓿短体线虫的侵染呈正相关。在所有初始种群（Pi）下，UT3对单播和间作处理的侵染均超过UT1和UT2。苜蓿和扁穗冰草地上部和根部重量的最大降幅出现在Pi为8条苜蓿短体线虫/立方厘米土壤时。Pi与苜蓿和扁穗冰草的地上部和根部生长以及线虫繁殖呈负相关。在所有接种水平下，单播和间作时UT3的繁殖系数（Rf）均超过UT1和UT2。犹他州种群在单播或间作时的Rf没有差异。线虫侵染随温度升高而增加，在30摄氏度时达到最大。种群UT3的致病性强于UT1和UT2，在所有土壤温度下均降低地上部和根部生长。种群UT1和UT2在20 - 30摄氏度时降低地上部和根部生长。土壤温度与地上部和根部生长呈负相关，与线虫繁殖呈正相关。在所有土壤温度下，UT3的繁殖均超过UT1和UT2。
