Cultural and morphological characterization of Colletotrichum capsici the causal organism of anthracnose of chilli
Keywords:Characterization, morphological, cultural, anthracnose, Colletotrichum capsici, Capsicum annuum, sporulation, isolates.
AbstractSixteen isolates of Colletotrichum capsici were collected from different chilli growing areas of MaharashtraÂ and their pathogenicity was proved under laboratory conditions. Maximum mycelial growth (87.00 mm)Â was recorded with CcA isolate followed by CcP (86.70 mm), CcJ (84.28 mm), CcH (83.37 mm), CcNÂ (79.89 mm), CcL (75.80 mm) and CcB (74.91 mm). Colony colour was dark brown in CcA and CcPÂ isolates whereas, it was gray with white mycelium in CcJ and CcB isolates. CcN and CcH showed blackÂ colony colour with grayish mycelium. Colony colour of CcO isolate was whitish creamy while, isolate CcLÂ produced grayish white colony. Topography of growth on PDA medium was flat in CcN, CcA and CcOÂ isolates and rose in case of CcJ, CcH, CcP, CcB and CcL isolates. Largest sized conidia (27.32 Ã— 2.89 Âµm)Â were produced by the isolate CcN followed by CcA (25.52 Ã— 3.54 Âµm) and CcP (25.12 Ã— 2.57 Âµm). ConidiaÂ of all the isolates were falcate, blunt to narrow at ends with oil globuse at centre. Maximum length of setaeÂ (116.23 Âµm) was recorded in CcA isolate followed by CcB (112.34 Âµm), CcO (110.77 Âµm), CcP (108.92Â Âµm), CcN (108.1 Âµm), CcJ (103.87 Âµm) and CcH (101.78 Âµm). All the isolates produced dark brown setaeÂ with smooth, septate, rigid, hardly swollen at the base and slightly tapered towards the paler acute apex.Â Among the different media tested, better growth and sporulation was recorded with Richardâ€™s agar (88.94Â mm), Czapekâ€™s dox agar (88.53 mm), Oat meal agar (87.53mm) and Sabouroud agar (87.31 mm).
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