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Mst. Tahera Tasmin1, Ismail Hossain2, Md. Aminul Islam Khan3, Mohammad Shahjahan Monjil1*
1Bangladesh Agricultural University, Bangladesh
2International University of Business Agriculture and Technology, Bangladesh
3Major General Mahmudul Hasan Adarsha College, Bangladesh
Abstract
The present study was performed to determine the pathogenic cause of mango fruit drop and its in-vitro control through the
application of plant extracts, phytohormones, and chemical fungicides. The prematurely fallen fruits at the pin-head stage, pea stage and
marble stage were taken for pathogen isolation. Colletotrichum gloeosporioides was identified as the pathogenic cause and several isolates
were established. Based on consistent mycelial growth in PDA culture media, one isolate was chosen for in-vitro management study using various
treatments. Six plant extracts, two phytohormones viz. NAA, 2,4-D, and six chemical fungicides were tested against C. gloeosporioides. With
three treatments, namely garlic clove, allamonda leaf and mahogany leaf extracts, mycelial growth of C. gloeosporioides was not observed for
seven days of study. In comparison to the control treatment, a significantly lower mycelial growth was found with both neem leaf extract and
marigold leaf extract. Garlic clove extract, allamonda leaf extract and mahogany leaf extract showed the highest percent growth inhibition
(100%) of C. gloeosporioides at 7 DAI in compared to the control treatment. In case of NAA and 2,4-D application in PDA, mycelial growth of
C. gloeosporioides was not detected also. As a result, extracts of garlic clove, neem leaf, allamonda leaf, mahagoni leaf, NAA
and 2,4-D as well as chemical fungicides can be introduced in field conditions to assess their effectiveness in controlling premature fruit drop
of mango caused by C. gloeosporioides.
Keywords:
Chemical fungicides, Colletotrichum gloeosporioides, Fruit dropping, Mango, Phytohormones, Plant extracts
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