Author(s):

BB Dharbale, DG Hingole, JB Bhalerao and PB Kardile

Abstract: The present investigation was carried out to study on pathological pre harvest fruit drop aspects of sweet orange in Marathwada region of Maharashtra. This experiment was conducted in the department of Plant Pathology, College of Agriculture, Badnapur and Sweet orange research station, (SORS) Badnapur, Dist-Jalna (VNMKV, Parbhani) M.S. in year 2016-17. The experiment was laid out in Completely Randomised Design-CRD, with three replications and ten treatments. Morphogenic characteristics of C. gloeosporioides was studied on different media and wide range of variability in respect of conidial and setae dimensions was observed. The conidial size Colletotrichum gloeosporioides ranged from18.21 to 26.62 µm. The large sized conidia (26.33-26.62x3.16-4.74 µm) were produced on the PDA which was followed by Richards agar, host leaf extracts, oat Meal Agar, Corn meal Agar, Czapak Dox Agar, Yeast mannitol Agar and Ashby’s mannitol Agar. However, small sized conidia were noticed on plain agar and Yeast extract Agar. The maximum average setae length was recorded on potato dextrose agar while maximum setae width was observed on Ashby’s mannitol Agar. Potato Dextrose Agar (PDA) was found to be most suitable medium for growth (90.00 mm). The second and third best medium found were Czapak Dox Agar (89.82 mm) and Oat Meal Agar (88.43 mm). Rest of the culture media recorded radial mycelial growth in the range of 49.67 mm (Host leaf extract Agar) to 85.38 mm (Richard’s Agar). All the culture media tested, exhibited wide range of colony colour, colony texture, sporulation, conidial dimensions and setae dimensions.

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