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首页> 外文学位 >Efficacy of abamectin as a seed treatment for control of Meloidogyne incognita and Rotylenchulus reniformis on cotton.
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Efficacy of abamectin as a seed treatment for control of Meloidogyne incognita and Rotylenchulus reniformis on cotton.

机译：阿维菌素作为种子处理剂对棉花根结线虫和轮虫轮虫的防治效果。

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摘要

Abamectin is a blend of B1a and B1b avermectins that is being used as a seed treatment to control plant-parasitic nematodes on cotton. Data on the toxicity of abamectin and its effectiveness as a seed treatment to control Meloidogyne incognita or Rotylenchulus reniformis on cotton are lacking.The toxicity of abamectin was based on an assay of nematode mobility, LD50 values of 1.56 mug/ml and 32.9 mug/ml were calculated based on 2 hr exposure for M. incognita and R. reniformis , respectively. There was no recovery of either nematode after exposure for 1 hr to its LD50 concentration. Sublethal concentrations greater than 0.39 mug/ml for M. incognita and 8.2 mug/ml for R. reniformis reduced (P = 0.05) infectivity on tomato.In field trials, suppression (P = 0.05) of M. incognita was observed 32 DAP by abamectin seed treatment whereas no suppression of R. reniformis was observed. No suppression of M. incognita was perceived by abamectin seed treatment in microplots. Suppression of M. incognita was observed in microplots by harpinEA and harpingalphabeta as a seed treatment and foliar spray, respectively. Seed cotton yields were variable for abamectin-treated seed, but numerically positive for harpin-treated cotton.Initial gall formation on developing taproots was suppressed ( P = 0.001), and penetration of 5-cm long taproots by M. incognita and R. reniformis was numerically suppressed by abamectin-treated compared to non-treated seed, but infection increased with root development. Using an assay of nematode mobility, the proportion of dead second-stage juveniles (J2) was higher (P = 0.05) following exposure to an excised radicle from abamectin-treated seed than non-treated seed, but lower (P = 0.05) than J2 exposed to the abamectin-treated seed coat. Thus a higher concentration of abamectin remained on the seed coat than emerging radicle. The concentration of abamectin transferred from the seed coat to the developing roots was limited, which contributed to the variability in suppression of plant-parasitic nematodes on cotton.
机译：阿维菌素是B1a和B1b阿维菌素的混合物，被用作种子处理剂来控制棉花上的植物寄生线虫。缺乏关于阿维菌素的毒性及其作为种子处理剂来控制棉花上的根结线虫或轮虫的种子的有效性的数据。阿维菌素的毒性基于线虫迁移率的测定，LD50值分别为1.56杯/毫升和32.9杯/毫升。分别基于隐身支原体和肾形支原体的2小时暴露计算。暴露于其LD50浓度1小时后，两种线虫均未恢复。亚致死浓度对于隐隐链球菌大于0.39杯/毫升，而对肾形隐孢子菌的浓度大于8.2杯/毫升，对番茄的感染力降低（P = 0.05）。在田间试验中，观察到32 DAP抑制了隐球菌对番茄的抑制（P = 0.05）。阿维菌素种子处理，而未观察到肾病菌的抑制。阿维菌素种子处理在微孔中未见到隐孢子虫的抑制。 harpinEA和harpingalphabeta作为种子处理剂和叶面喷雾剂分别在微图谱中观察到了隐孢子虫的抑制。阿维菌素处理过的种子的籽棉产量是可变的，但哈尔滨处理过的棉花的籽棉产量在数值上是正的。发育中的主根的初始gall形成被抑制（P = 0.001），隐孢子虫和肾形根瘤菌穿透5厘米长的主根。与未经处理的种子相比，经阿维菌素处理的种子在数量上受到抑制，但感染随着根发育而增加。使用线虫迁移率测定法，暴露于阿维菌素处理过的种子的切离胚根后，死亡的二级幼虫（J2）的比例高于未处理种子，但低于（P = 0.05） J2暴露于阿维菌素处理的种皮中。因此，种皮中残留的阿维菌素浓度要高于新兴胚根。从种皮转移到发育中的根部的阿维菌素浓度是有限的，这有助于抑制棉花上的植物寄生线虫。

著录项

  • 作者

    Faske, Travis Ryan.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Agriculture Plant Culture.Agriculture Plant Pathology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 87 p.
  • 总页数 87
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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