Management of purple blotch of onion caused by Alternaria porri by using some novel fungicides under field condition in western Odisha

D. Mandal, R. Pal, A. Mohanty
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Abstract

A field experiment was conducted at Regional Research and Technology Transfer Station, OUAT, Chiplima, Sambalpur, Odisha, India for the management of purple blotch of onion. From the experiment it was found that all the treatments were effective to reduce the severity of the disease as compared to untreated control. Among the treatments, seed treated with Carboxin 37.5%+Thiram 37.5%@ 2g/kg and three foliar sprays of Trifloxystrobin + Tebuconazole @0.4g/l of water at 10 days interval starting from initiation of the disease was most effective in reducing the purple blotch disease of onion (69.5% disease control) and was closely followed by seed treated with Carboxin 37.5%+Thiram 37.5% @ 2 g/kg and three foliar sprays of Tebuconazole @ 1.0ml/l of water (62.3% disease control). A maximum increase of yield (83.4%) with highest cost benefit ratio (1.97) was also achieved with the same treatment.
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在奥里萨邦西部大田条件下应用新型杀菌剂防治洋葱紫斑病
在印度奥里萨邦Sambalpur、Chiplima、OUAT区域研究和技术转移站进行了洋葱紫斑病管理的田间试验。从实验中发现,与未经治疗的对照组相比,所有治疗方法都有效地降低了疾病的严重程度。其中,从发病开始,每隔10 d,施用37.5% Carboxin +Thiram 37.5%@ 2g/kg和三次Trifloxystrobin + Tebuconazole @0.4g/l水的处理对洋葱紫斑病的防治效果最好(防治率为69.5%),其次是施用37.5% Carboxin +Thiram 37.5%@ 2g/kg和三次Tebuconazole @ 1.0ml/l水的处理(防治率为62.3%)。同样处理的产量增幅最大(83.4%),成本效益比最高(1.97)。
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