Utpal Dey

Collar Rot of Soybean: Sclerotium Rot Utpal Dey

Soybean (Glycine max L. Merill) has been found to affect and considerable losses caused by collar rot incited by Sclerotium rolfsii Sacc. Seed treatment with fungicides Carbendazim +Thiram in field and pot culture was found effective and significantly reduced pre-and post-emergence mortality in soybean Cv. MAUS-71 thereby increased the seed yield as well as test weight . In pot culture evaluation of bioagents and plant extracts , T.viride +T.harzianum combination and Neem extract was found effective in reducing pre-and post-emergence mortality. All the fungicides (7), bioagents (5) ,plant extracts (9) and non-target pesticides (8) evaluated in vitro (1000 and 2000 ppm) were found fungistatic/fungitoxic against S.rolfsii. However, Propioconazole recorded highest mycelial inhibition (85.28%), bioagent T.harzianum recorded(73.33%) maximum inhibition of mycelial growth, Neem extract was found effective (10 and 20 %) and recorded highest inhibition (73.37%). Nuvan was found most effective among the other pesticides and recorded maximum mycelial inhibition (72.03%) of the test pathogen.