Pathogens Associated with Foliar Blight of Onion

Shahnaz, Efath; Razdan, V.K.; Banday, Saba

doi:10.20546/ijcmas.2018.707.242

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…(Bock, 1964) has described purple blotch disease as a complex caused by three Alternaria species: A. porri, A. tenuis, and A. tenuissima and has proposed the name "Alternaria blotch" instead of purple blotch. It has also been reported that A. porri, A. alternata, and A. tenuissima can cause brown blotch in onions and produce similar symptoms to A. porri (Shahnaz et al, 2018). Vélez-Rodríguez and Rivera-Vargas (Vélez-Rodríguez & Rivera-Vargas, 2007) have reported that A. tenuissima is the primary causal agent of leaf blight in onion, while Ramjegathesh and Ebenezar (Ramjegathesh and Ebenezar, 2012) and Bihon et al (Bihon et al, 2016) have found that A. alternata is the main cause of onion leaf blight.…”

Section: Discussionmentioning

confidence: 89%

Identification of Alternaria spp. associated with purple blotch disease in onions and evaluation of plant-based fungicides for disease control

Din,

Kalsoom,

Yang

et al. 2023

Preprint

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Purple blotch of onion, a significant disease impacting major onion cultivating regions globally, is often linked with Alternaria spp. In this study, symptomatic onion leaves from 11 different fields were sampled, resulting in the acquisition of 24 Alternaria isolates. Six were chosen for sequence analysis, which involved the amplification of three regions: the internal transcribed spacer (ITS), glyceraldehyde 3-phosphate dehydrogenase (Gpd), and the major allergenic gene Alt a1. Our findings indicated the presence of three distinct Alternaria spp., with A. tenuissima demonstrating the highest disease incidence on the susceptible cultivar, Phulkari. In vitro bioassay results revealed that the methanolic leaf extract of D. stramonium exhibited the most significant antifungal activity (68.52%), outperforming M. piperita (43.13%) and C. procera (40.16%). Greenhouse experiments showed that aqueous extracts of D. stramonium reduced disease severity by 43.75% and 46.23% when used as a protective measure, and by 41.95% and 38.43% when used as a curative measure in two consecutive years. The D. stramonium extract was further fractionated using organic solvents, revealing varying degrees of antifungal activities: n-butanol (99.31%), chloroform (68.76%), n-hexane (50.56%), and ethyl acetate (62.60%). GC-MS analysis of the n-butanol fraction identified nine compounds, primarily alkaloids. From identified conpounds, scopolamine (15.23%), atropine (14.42%), apoatropine (9.55%), 2-methoxy-4-vinylphenol (2.33%) are already reported for their biological activity. Our findings suggest that D. stramonium has potential as an alternative disease control agent against purple blotch in onions.

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Section: Discussionmentioning

confidence: 89%

Identification of Alternaria spp. associated with purple blotch disease in onions and evaluation of plant-based fungicides for disease control

Din,

Kalsoom,

Yang

et al. 2023

Preprint

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“…Biological control has immense potential to be used as viable and alternative disease management strategy and it can be blended well with the integrated disease management capsules [1][2][3][4][5]. Biological control has proved very effective in disease management, more so of soil borne diseases [6][7][8][9], diseases of fruits [10][11][12], foliar diseases [13][14][15][16][17][18] as well as nematode diseases [14,19,20], besides innumerable other crop diseases and the list is growing day by day.…”

Section: Introductionmentioning

confidence: 99%

Biological Control of Diseases of Bottle Gourd

Shahnaz,

Banday,

Anwar

et al. 2023

Biological and Abiotic Stress in Cucurbitaceae Crops

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Biological control of plant diseases is an important component of disease management, particularly in the today's' world of environmental consciousness and awareness. It is particularly preferred method of disease management under organic production system. Biological control is successful in almost all the crops against a number of diseases but soil borne diseases are most responsive to bio-control methods. The agents of biological control, known as bio-control agents (BCAs) belong to a vast group of micro-organisms, particularly fungi (Trichoderma, Ampelomyces, etc), bacteria (Pseudomonas, Bacillus, etc) and actinomycetes. Bottle gourd is an important vegetable crop belonging to the family Cucurbitaceae. It suffers from a number of diseases like anthracnose, powdery mildew, downy mildew, wilt, etc. The present review shall be an attempt to review the biological control of the major diseases of bottle gourd.

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