Erwinia mallotivora is the causal agent of papaya bacterial crown rot disease in Lampung Timur, Indonesia

Abstract

Sixteen bacterial strains showing oval, convex with a white colony colour were obtained from the water-soaked lesions on the petioles and leaves of infected papaya (cv. calina) collected from a papaya field in Lampung Timur, Indonesia. The pathogenicity test showed that all the strains produced the same symptoms with those found in the field. Four representative strains were then chosen for further investigation. The phenotypic characteristics revealed that the strains resembled Erwinia mallotivora. Two representative strains were further identified using a 16SrDNA sequence analysis. The result showed that the strains were placed within the group of the type strain and the reference strains of E. mallotivora. To the best of our knowledge, this is the first finding of E. mallotivora as the causal agent of papaya crown rot disease in Indonesia. Among the sixteen plants used for the host range test, the symptom was only observed on eggplants, but not on the other fifteen plant species.

Lysinabacillus fusiformis and Paenibacillus alvei Obtained from the Internal of Nasutitermes Termites Revealed Their Ability as Antagonist of Plant Pathogenic Fungi

“…For example Pectobacterium subsp. brasiliensis ( Moleleki et al, 2013 ) which is recently named as P. brasiliense ( Portier et al, 2019 ) and Erwinia mallotivora ( Suharjo et al, 2021 ) revealed positive result on tobacco hypersensitive reaction test, however some of pectobacterium species i.e. P. atrosepticum and P. wasabiae type strain (isolated from wasabi) as well as P. wasabiae isolated from potato which is currently known as P. parmentieri ( Khayi et al, 2016 ) produced negative result ( Kim et al, 2009 ; Moleleki et al, 2013 ).…”

Genome Sequencing and Analysis of Trichoderma (Hypocreaceae) Isolates Exhibiting Antagonistic Activity against the Papaya Dieback Pathogen, Erwinia mallotivora

“…Hence, farmers rely on preventive measures and good management practices to contain and minimise the spread of the disease to neighbouring trees and plots [ 5 , 10 , 11 ]. Recently, E. mallotivora was reported to be affecting papaya in the Philippines and Indonesia, making this species a pathogen of concern that could affect the papaya industry in the entire Southeast Asia region [ 7 , 12 ]. A similar disease termed as papaya black rot has been recently detected in Japan and the pathogen was characterised to be from the genus Erwinia [ 13 ].…”