Survey of Purple Blotch Disease of Onion (Alternaria porri) of  Allahabad District

John, V. T.; Simon, Sobita; Maurya, Amit Kumar; Lal, Abhilasha A.

doi:10.20546/ijcmas.2018.710.009

Cited by 5 publications

(5 citation statements)

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“…Random survey was carried out in ten villages of Allahabad district viz., champatpur, Piparsa, Muradpur, Khama chakiya, Balsarag, Barali, Khitaria, Takari, Pahvri, Panvar five farmer's field were selected in each village with plot size (10 2 m). diseased samples were collected from each plot for isolation and identification of purple blotch incidence (Vinny John, 2018).…”

Section: Methodsmentioning

confidence: 99%

Effect of Green Manure Amendments and Spray of Spices Extract on Purple Blotch Disease Intensity of Onion (Allium cepa L)

Raju¹,

Simon²

2020

Int.J.Curr.Microbiol.App.Sci

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Section: Methodsmentioning

confidence: 99%

Effect of Green Manure Amendments and Spray of Spices Extract on Purple Blotch Disease Intensity of Onion (Allium cepa L)

Raju¹,

Simon²

2020

Int.J.Curr.Microbiol.App.Sci

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“…To meet local demand, Kenya requires an estimated 160,000 tonnes annually (KilimoTrust, 2017). Low onion production in Kenya is attributed to various challenges, including poor soil fertility, infestations by plant parasitic nematodes, pests like maggots, thrips, leaf miners, and diseases such as soft rot, bulb rot, center rot, sour skin, purple blotch, black mold, rust, white rot, downy mildew, and damping off (Meena and Verma, 2017;John et al, 2018;MOA, 2019).…”

Section: Original Research Articlementioning

confidence: 99%

“…Its symptoms start with small white spots on the foliage, which eventually develop into purplish blotches surrounded by yellow margins, particularly affecting older leaves (Sonawane et al, 2020). Simultaneously, the bulbs display orange rot starting from the neck (John et al, 2018). This disease results in substantial global yield losses, impacting between 5 to 50% of onion crops and leading to a 20 to 60% loss in bulb yield, combined with 30 to 50% postharvest losses (Petropoulus et al, 2017;John et al, 2020;Uddin et al, 2020).…”

Section: Original Research Articlementioning

confidence: 99%

“…The ability of Alternaria porri to persist in various sources, including seeds, soil, infected bulbs, plant debris, and weed roots, poses challenges in detection and management (Uddin et al, 2020;Sarnobat et al, 2020). Its development and invasion in onion crops are favored by specific environmental conditions, such as high relative humidity and optimal temperatures (John et al, 2018;Sarnobat et al, 2020;Sonawane et al, 2020). This complexity underscores the critical need for sustainable disease management strategies that address the challenges posed by Alternaria porri in onion cultivation while mitigating environmental and health risks associated with traditional control methods.…”

Section: Original Research Articlementioning

confidence: 99%

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Assessment of onion farming practices and purple blotch disease knowledge among farmers in varied agro-ecological zones of Nyeri County, Kenya

Isaboke,

Muraya,

Mwangi

et al. 2024

Arch. Agric. Environ. Sci.

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Onion (Allium cepa L.) is the second most produced vegetable globally, following tomato and plays a vital role in both cuisines and daily diets. However, the threat of diseases, such as purple blotch caused by Alternaria porri, poses a substantial risk to onion production, particularly in Nyeri County, Kenya. Despite its critical impact on farming, there is a lack of information on farmers' knowledge of purple blotch in this region. This study aimed to assess the onion farming practices and farmers' understanding of purple blotch disease across various agro-ecological zones (AEZs) in Nyeri County. Specifically, the study examines farmers' demographics, cultivated onion varieties, and their knowledge of purple blotch disease. Farms were selected using cluster random sampling. Data were collected from 100 onion farmers through semi-structured questionnaires, and statistical analysis was performed using the chi-square test in Scientific Analysis System (SAS) version 9.4 at α=0.05. The findings revealed that while the Rucet F1 onion variety was popular among the farmers (52%), there is no significant association (X2 (6, 100) = 11.947, p = 0.063) between the choice of variety and AEZs. Similarly, the preferred source of onion seeds, mainly Agroshop (84%), showed insignificant association (X2 (9, 100) = 7.153, p = 0.621) with AEZs. Despite 65% of farmers reporting knowledge about onion diseases, there is no significant association (p > 0.05) between their awareness of purple blotch and AEZs. In conclusion, the study highlights a significant gap in farmers' understanding of purple blotch disease, emphasizing the need for training programs to enhance disease identification skills. Early detection can empower farmers to implement proactive measures, ultimately improving onion productivity. This study recommends diversifying onion varieties for disease resilience, promoting awareness and training on purple blotch identification, engaging women and youths in farming, and fostering collaborative networks for ongoing knowledge exchange and improvement in onion cultivation in Nyeri County.

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“…Penyakit ini merupakan penyakit khas yang terdapat pada bawang merah. Umumnya menyerang tanaman bawang merah saat tanaman masih muda atau saat mulai pembentukan umbi (John et al, 2018;Safitri et al, 2019). Kehilangan hasil tanaman akibat serangan A. porri berkisar 50%-70% tergantung musim tanam bahkan dapat menyebabkan tanaman gagal panen (Resti et al, 2021).…”

Section: Pendahuluanunclassified

Isolasi dan karakterisasi cendawan endofit asal rizosfer bawang merah “Lembah Palu” dan potensinya menghambat penyakit bercak ungu Alternaria porri (ELL) CIF

Sudewi,

Ratnawati,

Jaya

et al. 2023

J. AGRO

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The decrease in shallot production due to Alternaria porri infection can reach 50%-70% or can even cause crop failure. One of the biological control methods to overcome this is by utilizing antagonistic microbes. The purpose of this study was to identify endophytic fungi from the rhizosphere of shallots "Lembah Palu " that have the potential to inhibit the A. porri fungus that causes purple spot disease. Research January-September 2022, the activity began with isolating endophytic fungi using the surface sterilization method, followed by characterization and identification of morphology macroscopically and microscopically, compatibility testing between isolates, and antagonism power test. The results obtained 5 isolates of endophytic fungi identified in the genus Fusarium sp., Aspergillus flavus, Penicillium sp., Aspergillus niger, and Trichoderma sp. A total of seven compatible interactions between endophytic fungi resulted from compatibility tests, while 3 other interactions were not compatible. The antagonism test of 5 fungal isolates against the A. porri produced an average inhibition of ≥ 75%. The HKP5 isolate (Penicillium sp) had the best inhibition of 78.96%. This indicates that endophytic fungal isolates have some potencies the potential to be developed as biological control agents in an effort to support sustainable agriculture.ABSTRAKPenurunan produksi tanaman bawang merah akibat serangan Alternaria porri dapat mencapai 50%-70% bahkan dapat menyebabkan terjadinya gagal panen. Salah satu metode pengendalian hayati untuk mengatasi hal tersebut yaitu dengan memanfaatkan mikroba yang bersifat antagonis . Tujuan dari penelitian ini untuk mengidentifikasi cendawan endofit asal rizosfer bawang merah “Lembah Palu” yang berpotensi dalam menghambat cendawan A. porri penyebab penyakit bercak ungu. Penelitian Januari-September 2022, kegiatan diawali dengan mengisolasi cendawan endofit menggunakan metode sterilisasi permukaan, dengan perendaman sampel akar berurutan dalam 2% Natrium hipoklorit, etanol 70% dan air steril, kemudian dikulturkan dalam media Potato Dextrose Agar (PDA). Selanjutnya setelah isolat tumbuh, disubkultur kembali untuk dilakukan karakterisasi dan identifikasi morfologi secara makroskopis dan mikroskopis, pengujian kompatibilitas antarisolat serta uji daya antagonisme. Dari hasil penelitian diperoleh 5 isolat cendawan endofit yang teridentifikasi dalam genus Fusarium sp., Aspergillus flavus, Penicillium sp., Aspergillus niger, dan Trichoderma sp. Sebanyak tujuh interaksi kompatibel antarcendawan endofit dihasilkan dari uji kompatibilitas, sedangkan 3 interaksi lainnya tidak kompatibel. Uji daya antagonisme 5 isolat cendawan terhadap patogen A. porri menghasilkan rata-rata daya hambat ≥ 75%. Isolat HKP5 (Penicillium sp) memiliki daya hambat terbaik sebesar 78,96%. Hal ini mengindikasikan bahwa isolat cendawan endofit berpotensi untuk dikembangkan sebagai agens pengendali hayati dalam upaya mendukung pertanian berkelanjutan.

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Survey of Purple Blotch Disease of Onion (Alternaria porri) of Allahabad District

Cited by 5 publications

References 0 publications

Effect of Green Manure Amendments and Spray of Spices Extract on Purple Blotch Disease Intensity of Onion (Allium cepa L)

Effect of Green Manure Amendments and Spray of Spices Extract on Purple Blotch Disease Intensity of Onion (Allium cepa L)

Assessment of onion farming practices and purple blotch disease knowledge among farmers in varied agro-ecological zones of Nyeri County, Kenya

Isolasi dan karakterisasi cendawan endofit asal rizosfer bawang merah “Lembah Palu” dan potensinya menghambat penyakit bercak ungu Alternaria porri (ELL) CIF

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