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首页> 外文期刊>European Journal of Plant Pathology >Vertical distribution of the plant-parasitic nematode, Meloidogyne chitwoodi, under field crops.
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Vertical distribution of the plant-parasitic nematode, Meloidogyne chitwoodi, under field crops.

机译：田间作物下植物寄生线虫Meloidogyne chitwoodi的垂直分布。

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摘要

The root-knot nematode Meloidogyne chitwoodi is a severe pest on sandy soils in Belgium and causes quality damage to economically important crops such as carrot, potato and black salsify. Pre-planting soil sampling to detect infestations has proven useful to farmers when taking decisions on the crop rotation. To develop an adequate sampling strategy, the vertical distribution of M. chitwoodi was examined under summer barley, carrot, fodder beet, bean, marigold and black fallow on two fields with a sandy soil. Soil samples were collected at monthly intervals from April 2004 to April 2006. Cores were taken to a depth of 70 cm and split into 10 cm segments. Nematodes were extracted by zonal centrifugation. Fodder beet increased the population of M. chitwoodi immensely; carrot was also a good host. Barley was a moderate host and under bean and marigolds the population decreased. The relative distribution of M. chitwoodi over the different soil layers during two successive years was consistent in each field. The different successions with good, moderate and poor hosts did not influence this distribution significantly. A logistic model was fitted to the mean cumulative percentages of nematodes at increasing soil depth. Farmers are advised to take soil samples for detection of M. chitwoodi immediately after harvest, especially after crops with a long field period. Adapting the depth of the cores taken to the vertical distribution of the population can increase the chances of detection. Our results suggest that this distribution is persistent in crop rotations and depends on field characteristics.
机译：根结线虫Meloidogyne chitwoodi是比利时沙质土壤上的一种严重害虫，对经济上重要的农作物如胡萝卜，马铃薯和黑婆罗门参造成质量损失。种植前进行土壤采样以检测病虫害已被证明对农民进行轮作决策很有用。为了制定适当的采样策略，在两个有沙土的田地上，在夏季大麦，胡萝卜，饲料甜菜，豆类，万寿菊和黑休耕地下，检查了Chitwoodi的垂直分布。从2004年4月到2006年4月，每月间隔采集一次土壤样品。取芯的深度为70厘米，分成10厘米。通过区域离心法提取线虫。饲料甜菜极大地增加了Chitwoodi的种群。胡萝卜也是很好的寄主。大麦是温和的寄主，在豆类和万寿菊种下，种群减少了。连续两年在不同土壤层上的Chitwoodi相对分布在每个田间都一致。具有良好，中度和较差宿主的不同演替不会显着影响此分布。将逻辑模型拟合到土壤深度增加时线虫的平均累积百分比。建议农民在收获后立即取样土壤样品，以检测Chitwoodi。使岩心深度适应种群的垂直分布可以增加发现的机会。我们的结果表明，这种分布在作物轮作中是持久的，并取决于田间特性。

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