Year: 2013 | Month: December | Volume 6 | Issue 4
Evaluation of Plaster of Paris and Some Fungicides for Management of Foot rot of Amorphophallus campanulatus Blume Caused by Sclerotium rolfsii Sacc.
Abstract: <span class="Apple-tab-span" style="white-space:pre"> </span>Incidence of Foot rot disease of Elephant foot yam [Amorphophallus campanulatus Blume, syn: A. paeoniifolius (Dennst.) Nicolson] caused by Sclerotium rolfsii Sacc. is common in West Bengal. Occasionally it causes severe damage of the crop. When Plaster of Paris used on the diseased tissue in standing crop, it showed strong adverse effect on mycelial growth and survival of sclerotia. White mycelia and sclerotia produced on disease tissue lost their viability. Plant with small lesion grew normally indicating that the disease was checked without causing any phytotoxic effect. Plaster of Paris of commercial grade (CaSO4.½ H2O), available in synthetic bag in hardware shop. In laboratory test on viability of sclerotia, Plaster of Paris showed similar adverse effect. Eight fungicides (Indofil M-45, Bavistin, Blitox, Vitavax Power, Kavach, Curzet, Krilaxyl MZ) used in this test reduced sclerotial germination. Vitavax Power (Carboxin 37.5% + Thiram 37.5% WP) totally inhibited sclerotial germination. Kavach (Chlorothalonil 75%) and Krilaxyl MZ (Metalaxyl 8% + Mancozeb 64%) reduced germination upto 95%. Application of Plaster of Paris at three different doses at the base of the plant (2.0, 5.0 and 10.0 grams/plant) did not cause any phytotoxic symptoms like necrosis, epinasty, hyponasty, wilting, leaf tip injury, leaf surface injury, vein clearing, rotting at collar region on six different crops i.e. elephant foot yam, groundnut, brinjal, chilli, basella and radish. Hence, it may be incorporated in Integrated Disease Management (IDM) programme.
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