植物诱导抗病剂组合应用对烟草花叶病的防控效果

目的]探讨植物诱导抗病剂组合对烟草花叶病的防控效果。方法]在模拟病圃环境下,研究了6种植物诱导抗病剂的不同组合对烤烟栽培品种红花大金元的烟草花叶病的防控效果。结果]多肽保与AHO 2种诱导剂的组合应用对控制TMV有良好效果,能明显推迟带毒隐症烟株TMV的发病时间,移栽后70 d对以清水和东旺毒消为对照的大田期烟株TMV的平均防效分别达到69.64%和43.25%,且在株高、叶数方面表现出明显优势,叶片生长发育状况良好。烟苗携带TMV病毒与症状能否表现无直接相关性,带毒隐症烟苗只有在发病条件适宜时才会表现症状。带毒隐症烟苗栽后19 d内是TMV发病的高峰期,在育苗阶段与大田期施用有效药剂,以及移栽后促进烟苗早生快发是控制其发病的关键措施。结论]为制定烟草花叶病的防控措施提供了理论依据。

Control Effects of Combination of Plant Induced Resistant Agents against Tobacco Mosaic Virus (TMV)

Objective] The paper was explore the control effects of combination of plant induced resistant agents against tobacco mosaic virus(TMV).Method] The control effects of 6 different combinations of plant induced resistant agents against TMV of flue-cured tobacco cultivar HongDa were studied under the environment of simulated disease nursery.Result] The combination of two induced agents polypeptide-agents and 3-acetonyl-3-hydroxyoxindole(AHO) had good control effect against TMV,which could obviously delay the incidence time of TMV in infected tobacco plants.With water and Duxiao as control,their average control effects against TMV of tobacco plants during field period reached 69.64% and 43.25% after transplanting for 70 d.They also showed obvious superiority in the aspects of plant height and leaf number,and the growth and development condition of leaves was good.Tobacco seedlings carrying TMV virus had no direct correlation with whether the symptoms performed,the seedlings carrying virus would perform symptom only when the incidence condition was suitable.The peak period for the incidence of TMV in seedlings carrying virus was during 19 d after transplanting.Spraying effective agents during nursery stage and field period,as well as promoting early growth and quick tiller of tobacco seedlings after transplanting were the key measures to control its incidence.Conclusion] The study provided theoretical basis for preparing the control measures against TMV.