本文报道柑桔的福建根结线虫Meloidogyne fujianensis新种。新种的特征是雌虫阴门右缘外侧有一中央凹陷的小圆隆，口针较短，排泄孔开口距头顶较远，雌虫、雄虫和第二期幼虫背食道腺孔至口针基球底部的距离较长。第二期幼虫a值较小，直肠不膨大，半月体与排泄孔处于同一水平上。这些特征与近似种南方根结线虫M.incognita和花生根结线虫M.atenuria可相区别。

南靖柑桔的福建根结线虫（Meloidogyne fujianensis）经扫描电镜观察显示它跟四种常见的根结线虫有明显区别，最明显的区别在于其雌虫的头部结构——唇盘呈“X”状，唇盘和中唇之间有沟隔开。此外，雄虫头区无环纹、幼虫唇盘和中唇呈短哑铃状，也有别于其近似种南方根结线虫和花生根结线虫，而其幼虫头区平滑或偶具一条短环纹也有别于前者。

在厦大校园和鸿山公园检查了15株吊灯花的根结线虫受穿刺芽孢杆菌感染的情况，株感染率为100%，用漂浮法共检查根周土壤的322只幼虫，感染率为58.4%，感染强度为8.9（1～200）个孢子/幼虫；用孵化法共检查从卵块孵出的390只幼虫，感染率为42.6%，感染强度为4.8（1～100）个孢子/幼虫。虽然两种方法都有效，但前者优于后者。迄今为止，吊灯花是自然界中穿刺芽孢杆菌感染最严重的一种寄主，其大面积自然感染表明吊灯花可作为制造穿刺杆菌菌剂原料的优良树种，有希望投入应用，进行大量生产。

研究了茶苗南方根结线虫（Meloidogyne incognita）虫口密度的季节消长规律和在不同深度根系中的分布，以及茶圃杂草作为其保虫寄主的感染情况。感染率10～12月最高，8月最低，平均感染强度10月最高，7月最低；从上到下在第10～15cm处雌虫最多，第20～25cm侵袭期幼虫晟多；10种杂草感染该虫种。虫口密度随月积温的上升而上升，而雄性比则随月总雨量的升高而下降。

In order to make use of B. penetrans the preparation of these bacteria was prepared successfully. Each gram of the specimen contains more than 3.1×10 8 spores according to determination by bloodcount plate. The method of its production are: First, infect the larvae of root-knot nematodes with the spores of B. penetrans. Second, inoculate infectable plants with the infected larvae. Third, beat the root-systems of inoculated plants after adding some water. The flowed liquid from a bronze sieve was mixed with the clear water, filtered, precipitated, air-dried under 5～10℃, and grinded into fine powder, When these powder was added into the water which contained the larvae of root-knot nematodes, the spores of B. penetrans adhered to the cuticles of these larvae in 24h. The pot experiments of tomato, chilli and cockscomb showed that the galls, egg-sacs, females, males and all-stages of larvae produced by the plant inoculated with the larvae infected with B. penetrans are about 75%～80% less than that without these bacteria. Thus it can be seen that the spores of B. penetrans can depress the populations of root-knot nematodes obviously. Therefore, it is a promising preparation for biological control.