BACTERIAL SOFT ROT DISEASE IN PINEAPPLE (ANANAS COMOSUS (L.) MERR.) -IDENTIFICATION AND IN VITRO STUDIES

Maya, T.*¹, Gayathri Unnikrishnan², Radhika N.S.³, Sailaja Kumari M.S.⁴ and Chinju, E.A.⁵

1,2,5Pineapple Research Station, Kerala Agricultural University, Vazhakulam – 686670

4Regional Agricultural Research Station, Kerala Agricultural University, Kumarakom-686 563

³ Department of Plant Pathology, College of Agriculture, Kerala Agricultural University,

Vellayani-695522

Email: maya.t@kau.in

Received-01.12.2022, Revised-12.12.2022, Accepted-23.12.2022

Abstract: ‘Vazhakulam pineapple’, the Mauritius pineapple cultivar is the predominant variety cultivated in Kerala. Soft rot disease of pineapple fruit, which sporadically spread after heavy rainfall and floods in Kerala, caused severe economic loss to farmers. This disease was characterized by fruit deformation, water blisters in the immature stages, internal decay, and soft rot in mature fruit. Severely affected fruits of Mauritius pineapple were collected from Manjalloor and Avolypanchayats of Muvattupuzha block in Ernakulam district and based on morphological, biochemical and cultural characteristics and polymerase chain reaction (PCR) assay the pathogen was identified as Enterobacter cloaca.Antibiotic formulation containing Streptomycin sulphate 90% and Tetracycline hydrochloride 10%,at 100 ppm concentration was found to inhibit the growth of E. cloacae (10⁹CFU/m).

Keywords: Bacterial soft rot, Vazhakulam Pineapple, Mauritius, Enterobacter cloacae

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