Assessment and characterization of mung bean (Vigna radiata) bacterial brown spot in Eastern Amhara, Ethiopia

Abstract

Mung bean is one of the major early maturing pulse crop grown all over the world including Ethiopia. The production of the crop in Ethiopia, however, suffers from many diseases caused by bacteria. The study aims to assess the intensity and identify the major foliar bacterial and fungal pathogens of the crop. Purposively, 3 districts and randomly 90 mung bean fields were surveyed during the study period. Pathogenicity test, macroscopic and microscopic observations and biochemical tests were used for identification. Symptomatic of 33 diseased bacterial samples were initially isolated and purified on nutrient agar. Bacterial brown spot was found as important foliar devastating identified diseases, even if its distribution varied among localities. Water soaked, small, circular, brown lesions surrounded by yellow zones were observed in all bacterial brown spot isolates after 8 days of inoculation. Based on cultural and biochemical characteristics, bacterial isolates were identified as grams negative phytopathogenic bacteria called Pseudomonas syringae pv. Syringae. However, further characterization of both isolates and phenotypic characteristics of a large population of newly emerged P. syringae pv. Syringae from various host plants should capture the research attention. This is the first report on the occurrence of such disease in Ethiopia.

Progress in the Use of Combined Omics for Mungbean Breeding Improvement and Its Potential in Promoting Resistance against Cercospora Leaf Spot

“…Mungbean is the most important legume crop for the agricultural production system and a great source of high-quality protein, minerals, and vitamins [7,8]. The crop plays a valuable role in the agricultural crop rotation system as it has a short duration (60-75 days), is drought-tolerant, and possesses nitrogen fixation capabilities, which play a substantial role in increasing soil fertility [9][10][11]. As a legume food crop, mungbean is utilised in several ways.…”

“…Despite the diverse importance of mungbean as food, animal feed, improving soil fertility, and foreign currency earnings, the crop has not received the same level of attention as cereals to increase its productivity [11,18,20]. It is threatened by a series of biotic stresses, especially diseases due to fungal pathogens such as Cercospora canescens Illis and Martin [21], Fusarium equiseti and Fusarium chlamydosporum [22], and Podosphaera xanthii [23], contributing to major yield losses in mungbean compared to all other crops [21,24].…”