Cultural practices in relation to purple blotch disease of onion

Awad, Mohamed A.; El-Shenawy, Z.; Omran, A. F.; Shatla, M.N.

doi:10.1016/0304-4238(78)90005-5

Cited by 12 publications

(11 citation statements)

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“…This therefore suggests that higher disease incidence is associated with lower fresh bulb yield, and is mainly the result of environmental influence than genotypic influence. This result is expected since purple blotch have been reported by several workers (Awad et al 1978;Brar et al 1990;Everts and Lacy 1990b;Daljeet et al 1992;Price 2000, 2001;Arboleya et al 2003;Schwartz 2004) to be under the influence of the environment. Highly significant positive environmental correlation was also observed between bulb diameter and bulb weight, days to maturity and number of leaves/plant.…”

Section: Discussionsupporting

confidence: 64%

“…In other words, the ranking of the populations for the character vary with location. Purple blotch disease of onion is greatly influenced by location (environment), nutrition (Awad et al 1978), cultural practices (Arboleya et al 2003), environmental conditions (Everts and Lacy 1990a;Price 2000, 2001) and prevalence of other disease factors (Brar et al 1990), all of which contribute to resistance or susceptibility to the disease. The influence of the environment on the development of purple blotch has been reported by several authors.…”

Section: Discussionmentioning

confidence: 99%

“…No fertilizer was applied to the fields because according to Awad et al (1978) application of nitrogen to onion plants increases susceptibility to purple blotch disease due to the production of succulent leaves, while addition of potassium and calcium super phosphate improves resistance to purple blotch. Soil tests were conducted at both locations and for both seasons.…”

Section: Methodsmentioning

confidence: 99%

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Heterosis of purple blotch (Alternaria porri (Ellis) Cif.) resistance, yield and earliness in tropical onions (Allium cepa L.)

Abubakar

Ado

2007

Euphytica

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Heterosis of purple blotch (Alternaria porri (Ellis) Cif.) resistance, yield and earliness in tropical onions (Allium cepa L.)

Abubakar

Ado

2007

Euphytica

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“…and Stemphylium leaf blight (SLB) caused by Stemphylium vesicarium (Wallr.) Simmons, are the major diseases of onion world-wide affecting the foliage severely resulting in crop loss ranging from 30 to 100 per cent both in seed and bulb crop from year to year (Awad et al, 1978;Everts and Lacy, 1990a, b;Brar et al, 1990;Aveling et al, 1993Aveling et al, , 1994Chaput, 1995;Cramer, 2000) and are more prevalent in warm and humid environment (Suheri and Price, 2000a, b).…”

Section: Introductionmentioning

confidence: 99%

Management of Purple Blotch Complex of Onion in Indian Punjab

Yadav¹,

Singh

Jain

et al. 2017

Int J Appl Sci Biotechnol

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Six systemic fungicides viz., Kitazin 48 EC (iprobenfos), Tilt 25 EC (propiconazole), Folicur 25 EC (tebuconazole), Score 25 EC (difenoconazole), Amistar Top 325 SC (azoxystrobin 18.2% + difenoconazole 11.4%) and Nativo 75 WG (trifloxystrobin 25% + tebuconazole 50%), and two non-systemic fungicides viz., Indofil M-45 75 WP (mancozeb) and Kocide 77 WP (copper hydroxide), were evaluated under in vitro and field conditions for their efficacy to manage purple blotch complex of onion caused by Alternaria porri and Stemphylium vesicarium. Field efficacy of the fungicides at different concentrations were determined in controlling the purple blotch complex of onion under artificial epiphytotic conditions on bulb and seed crop (cultivar PRO-6) during the Rabi season 2014-2015 and 2015-2016, respectively. The triazole fungicides, tebuconazole and difenoconazole proved superior in inhibiting growth of A. porri and S. vesicarium under in vitro conditions, respectively. Further, foliar sprays (3 for bulb crop and 4 for seed crop) of tebuconazole 25 EC (Folicur) @ 0.1 per cent at fortnightly interval most effectively managed purple blotch complex of onion under field conditions with highest Benefit: Cost ratio (8.75:1 and 88.7:1) in bulb and seed crop, respectively. Seed-to-seed method of onion seed production recorded significantly lower disease severity and higher seed yield than that of bulb-to-seed method under natural epiphytotic conditions. The present findings can be instrumental in devising strategy for the integrated management of A. porri, S. vesicarium singly as well as in complex, serious limiting biotic factors in onion production.

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“…Vol 5(4): 498-504. DOI: 10.3126/ijasbt.v5i4.18637 Simmons, are the major diseases of onion world-wide affecting the foliage severely resulting in crop loss ranging from 30 to 100 per cent both in seed and bulb crop from year to year (Awad et al, 1978;Everts and Lacy, 1990a, b;Brar et al, 1990;Aveling et al, 1993Aveling et al, , 1994Chaput, 1995;Cramer, 2000) and are more prevalent in warm and humid environment (Suheri and Price 2000a, b). The typical oval to elliptical lesions are colonised by either Alternaria porri, Stemphylium vesicarium or mixtures of both pathogens and…”

Section: Introductionmentioning

confidence: 99%

Field Assessment of Onion Genotypes for Resistance against Purple Blotch Complex (Alternaria porri And Stemphylium vesicarium) under Artificial Epiphytotic Conditions in Indian Punjab

Yadav¹,

Singh

Dhatt

et al. 2017

Int J Appl Sci Biotechnol

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Forty-one genotypes of onion were evaluated for their relative response to purple blotch complex caused by Alternaria porri and Stemphylium vesicarium under artificial epiphytotic condition in field during Rabi 2014-2015 and 2015-2016. Significant variation in disease severity among the onion genotypes was found over two years but the pooled analysis revealed that most of the variations were due to genotype x year interaction. None of the genotypes exhibited resistance to the disease complex. Of the test genotypes, eighteen were found moderately susceptible while twenty one were found susceptible to the disease complex. Two genotypes viz., Punjab Naroya and OSR-1364 exhibited highly susceptible reaction. However, six genotypes viz., P-96, P-30, P-121, OSR-1359, P-98 and OSR-1370 showed superior yield performance. Purple blotch complex exhibited highly significant negative correlation of 0.71 and 0.67 with fresh bulb yield and bulb size, respectively. Cluster analysis of onion genotypes was performed based on disease and yield variables and the genotypes were furthered grouped into five clusters based on average values of disease and yield variables.

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Cultural practices in relation to purple blotch disease of onion

Cited by 12 publications

References 1 publication

Heterosis of purple blotch (Alternaria porri (Ellis) Cif.) resistance, yield and earliness in tropical onions (Allium cepa L.)

Heterosis of purple blotch (Alternaria porri (Ellis) Cif.) resistance, yield and earliness in tropical onions (Allium cepa L.)

Management of Purple Blotch Complex of Onion in Indian Punjab

Field Assessment of Onion Genotypes for Resistance against Purple Blotch Complex (Alternaria porri And Stemphylium vesicarium) under Artificial Epiphytotic Conditions in Indian Punjab

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