Collar rot, caused by the fungus Sclerotium rolfsii, is the most widespread and devastating disease affecting elephant foot yam (EFY), leading to significant yield loss. In addition to causing economic damage, high disease incidence results in postharvest rot and a lack of quality planting material for the next season. The increasing incidence of collar rot in the past decade is alarming, and existing management practices have not effectively controlled the pathogen. Therefore, there was an urgent need to develop an effective management strategy to mitigate crop loss. The combination of fungicide, Carbendazim + Mancozeb, bio-agents Trichoderma asperellum and Bacillus amyloliquefaciens, showed high inhibition in lab studies. A preliminary field trial was conducted with these selected bio-agents and fungicide, in addition to the organic amendment vermicompost. Based on the results of the preliminary field trial and another study on managing postharvest rot in elephant foot yam, treatments were finalized, and field trials were conducted over 3 years at ICAR-CTCRI. These results were further validated by testing the same treatments in five states of India. Dipping the corms in a combination fungicide (Carbendazim 12% + Mancozeb 63% WP) for 10 min before storage, treating the corms with cow dung slurry enriched with T. asperellum at 5 g/kg corm three days before planting, and drenching the plant base twice with the same fungicide resulted in the lowest disease incidence (3.19%) and highest yield (36.70 t ha⁻1) compared to 12.85% disease incidence and 28.37 t ha⁻1 yield in the control.

中文翻译：

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优化针对 Sclerotium rolfsii Sacc 的管理干预措施。象足山药 （Amorphophallus paeoniifolius （Dennst.）Nicolson） 在印度


由真菌 Sclerotium rolfsii 引起的项圈腐病是影响象足山药 （EFY） 的最广泛和最具破坏性的疾病，会导致严重的产量损失。除了造成经济损失外，高病害发病率还会导致采后腐烂和下一季缺乏优质种植材料。过去十年中衣领腐烂病发病率的增加令人担忧，而现有的管理措施并未有效控制病原体。因此，迫切需要制定有效的管理策略来减轻作物损失。杀菌剂、多菌灵 + 代森锰锌、生物制剂木霉菌和解淀粉芽孢杆菌的组合在实验室研究中显示出高抑制性。除了有机改良剂蚯蚓堆肥外，还使用这些选定的生物制剂和杀菌剂进行了初步的田间试验。根据初步田间试验的结果和另一项关于管理象足山药采后腐烂的研究，最终确定了治疗方法，并在 ICAR-CTCRI 进行了为期 3 年的田间试验。通过在印度的五个邦测试相同的治疗方法，这些结果得到了进一步的验证。储存前将球茎浸入复合杀菌剂（多菌灵 12% + 代森锰锌 63% 可湿性粉剂）中 10 分钟，在种植前 3 天用富含 5 g/kg 球茎的 T. asperellum 牛粪浆处理球茎，并用相同的杀菌剂浸泡植物基部两次，与对照的 12.85% 和 28.37 t ha⁻1 产量相比，病害发生率最低 （3.19%） 和最高产量 （36.70 t ha⁻1）。