Agricultural Science Digest

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Agricultural Science Digest, volume 36 issue 3 (september 2016) : 250-252

Management of leaf spot (Alternaria polianthi) of tuberose through fungicides

N. Mazumder*, S. K. Borah, Preeti Hatibarua
1<p>Horticultural Research Station, Assam Agricultural University,&nbsp;Kahikuchi, Azara, Guwahati-781 017, Assam, India.</p>
Cite article:- Mazumder* N., Borah K. S., Hatibarua Preeti (2016). Management of leaf spot (Alternaria polianthi) of tuberose through fungicides . Agricultural Science Digest. 36(3): 250-252. doi: 10.18805/asd.v36i3.11454.

Six fungicides viz., mancozeb 75 WP @ 0.2%, chlorothalonil 75% WP @ 0.2% , tricyclazole 75% WP @ 0.1%, iprodione 25% + carbendazim 25% WP @ 0.1% , difenconazole 25% EC @ 0.1%, azoxystrobin 23 SC @ 0.1% were evaluated for managing  leaf spot (Alternaria polianthi) of tuberose (Polianthes tuberosa L.) cv. Single Petal with during kharif,  2010-2013. Four sprays with  azoxystrobin (0.1%)  at 15 days interval, starting on disease appearance proved to be the most effective and resulted in the  lowest  disease incidence (10.98 PDI )  compared to  control ( 34.39 PDI ). This treatment also gave a fairly good benefit: cost (B: C) ratio of 6.87. The economic analysis, however, revealed the effectiveness of a combo fungicide, iprodion (25%) + carbendazim (25%), followed by difenconazole when they were applied at 0.1% concentration. These treatments recorded highest B:C ratio of 7.11 and 6.90 with  69.98% and 71.47% disease reduction, respectively.

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