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首页> 外文期刊>Australasian Plant Pathology >A survey of nematodes associated with pyrethrum in Tasmania, Australia, and the susceptibility of pyrethrum cultivars to root-lesion nematode
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A survey of nematodes associated with pyrethrum in Tasmania, Australia, and the susceptibility of pyrethrum cultivars to root-lesion nematode

机译：澳大利亚塔斯马尼亚州与除虫菊相关的线虫调查，以及除虫菊栽培品种对根病变线虫的敏感性

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摘要

In a survey of fields in northern Tasmania, Australia, with various cropping histories, root-lesion nematode (Pratylenchus spp.) was detected in soil from all 99. elds sampled before planting pyrethrum. Population densities were generally low, but seven. elds had more than 600 Pratylenchus/200mL soil, with the maximum density being 3930/200mL soil. Root-knot nematode (Meloidogyne spp.) was detected in 20. elds, with only three having population densities greater than 50/200mL soil. Pratylenchus spp. from a subset of 31 fields were identified to species level, with Pratylenchus crenatus, P. penetrans, P. neglectus and P. thornei occurring in 27, 10, 2 and 3 fields, respectively. In pyrethrum crops aged 1-2 years, root-lesion nematode was recoveredfrom all 70. elds sampled, with 18 fields having more than 300/200mL soil. The highest population density was 960/200mL soil. Eighteen fields had more than 200/g fresh weight of root with a maximum of 786/g fresh weight of root. P. crenatus and P. penetrans were extracted from roots of pyrethrum transplants grown for similar to 3 months in field soil from 8 and 4 of 10 fields, respectively, indicating that pyrethrum was a host of these species. In two pot experiments conducted in the glasshouse, with four commercial pyrethrum cultivars, P. penetrans multiplication rates (the ratio of final to initial nematode population densities) ranged from 2.7 to 7.9 and 2.2 to 6.6.
机译：在澳大利亚塔斯马尼亚州北部的田野调查中，有不同的种植历史，在种植除虫菊之前，从所有99.田间的土壤中检出了根茎线虫（Pratylenchus spp。）。人口密度普遍较低，但只有七种。田间有超过600株鼠李/ 200mL土壤，最大密度为3930 / 200mL土壤。在20个领域中发现了根结线虫（Meloidogyne spp。），只有三个具有大于50 / 200mL土壤的种群密度。 Pratylenchus spp。从31个田地的一个子集中，对物种水平进行了鉴定，其中Pratylenchus crenatus，P。penetrans，P。neglectus和P. thornei分别出现在27、10、2和3个田地中。在1-2岁的除虫菊作物中，从全部70个采样场中回收了根部病虫线虫，其中18个田地土壤土壤含量超过300 / 200mL。最高的人口密度是960 / 200mL土壤。 18个田地的根鲜重超过200 / g，最大根鲜重为786 / g。从分别在10个田地中的8个田地和4个田地土壤中生长了大约3个月的除虫菊移植根中提取了C. crenatus和penetrans，这表明除虫菊是这些物种的宿主。在温室中进行的两个盆栽试验中，有四个商业除虫菊栽培品种，P。penetrans繁殖率（最终线虫与初始线虫种群密度之比）的范围为2.7至7.9和2.2至6.6。

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