Survey for the Turcicum Leaf Blight Disease Incidence in Southern Karnataka

2018 ◽  
Vol 6 (2) ◽  
pp. 330-335
Author(s):  
Manu T. G. ◽  
Keyword(s):  
Disease Incidence ◽  
Leaf Blight ◽  
Blight Disease

scholarly journals Prevalence and Severity of Leaf Blight Disease of Chrysanthemum in Southern regions of Karnataka and in-vitro Fungicidal Effect on Alternaria alternata

2015 ◽  
Vol 9 (3) ◽  
pp. 38-45 ◽  
Author(s):  
G. Shamala ◽  
G. R. Janardhana
Keyword(s):  
Alternaria Alternata ◽  
Disease Incidence ◽  
Life Sciences ◽  
Leaf Blight ◽  
Cut Flowers ◽  
In Vitro Evaluation ◽  
Karnataka State ◽  
Commercially Important ◽  
Blight Disease

Chrysanthemum is one of the commercially important flower crop with great potential both as loose and cut flowers in Karnataka state. In the present study, prevalence and incidence of leaf blight disease was studied in six major growing districts of South Karnataka during 2012 - 2013. The pathogen associated with leaf blight disease was isolated and identified as Alternaria alternata. The study revealed that, the disease was distributed in Southern districts of Karnataka wherever Chrysanthemum is grown. The varieties Chandini and Karnel were more susceptible to blight showing highest disease incidence (100%) and severity (100%) recorded from Mandya and Mysore regions. The lowest disease incidence, severity and PDI of 18.40%, 38.68% and 24.89% were recorded on Rajawhite variety in Bangalore region. During 2013, the highest disease incidence, severity and PDI with 100%, 98.47%, and 45.71% were recorded in Mysore district on Chandini variety. In vitro evaluation of four fungicides on Alternaria alternata revealed that Carbendazim+Mancozeb was most effective with 95.65% inhibition followed by Carbendazim, Mancozeb and Metalaxyl+Mancozeb with 68.26%, 91.30% and 91.30% inhibition of the mycelium at 2.0% concentration.DOI: http://dx.doi.org/10.3126/ijls.v9i3.12465   International Journal of Life Sciences 9 (3): 2015; 38-45

scholarly journals Incidence of leaf blight disease of Egusi melon in South-west Nigeria

2020 ◽  
Vol 28 (2) ◽  
pp. 255-265
Author(s):  
J.F. Ogunsola ◽  
B. Ikotun ◽  
K.E. Ogunsola
Keyword(s):  
Fungal Pathogens ◽  
Citrullus Lanatus ◽  
Disease Incidence ◽  
Leaf Blight ◽  
Economic Damage ◽  
Colletotrichum Truncatum ◽  
Southwestern Nigeria ◽  
Lasiodiplodia Theobromae ◽  
Ondo State ◽  
Blight Disease

Egusi melon (Citrullus lanatus (Thumb) Mansf.) is an important vegetable crop grown for edible seeds and oil in West Africa. Leaf Blight Disease (LBD) is one of the major constraints to its production, with potential to cause economic damage. The objective of this study was to investigate the incidence and distribution of leaf blight on Egusi melon in Southwestern Nigeria. A survey of LBD of Egusi melon was conducted in 2015 and 2016, in five southwestern States of Nigeria (Ogun, Oyo, Osun, Ekiti and Ondo States). Twenty plants each, were randomly sampled from 150 farms comprising 30 farms each, from each State. The distribution of different Egusi melon varieties planted was recorded. “Bara” cv. was the most cultivated variety (51.6%); followed by “Bojuri” (30.4%) and “Serewe” (18%). Leaf blight was observed in most farms in the five States, from 73% in Osun and Oyo states to 83% in Ondo State. Disease incidence and severity varied with locations and cultivars, and ranged from 0.0-87.5±18% and 1.0±0-4.5±0.8 in Osun State to 20.0±19 - 95.0±4.5% and 2.3±1.5 - 5.0±0 in Ondo State. Out of the twelve fungal pathogens from ten genera isolated from infected plants, only Colletotrichum truncatum, C. gloeosporioides and Lasiodiplodia theobromae caused Leaf blight on Egusi melon. Key words: Colletotrichum gloeosporioides, Colletotrichum truncatum, Lasiodiplodia theobromae

scholarly journals Assessing Taro (Colocasia esculenta (L.) Schott) Leaf Blight Incidence, Severity, and Farmers’ Knowledge of the Disease in Fako Division of Cameroon

2020 ◽  
pp. 17-29
Author(s):  
Mandah Cicelia Takor ◽  
Ekwa Yawa Monono ◽  
Ojong Agbor Ntane ◽  
Jemimah Evenye Ngale ◽  
Lum A. Fontem
Keyword(s):  
Disease Severity ◽  
Disease Incidence ◽  
Management Strategies ◽  
Leaf Blight ◽  
Cultural Methods ◽  
Randomized Design ◽  
High Prevalence ◽  
Severity Of The Disease ◽  
Blight Disease ◽  
Taro Leaf Blight

Taro leaf blight (TLB), a major disease of taro plant caused by Phytophthora colocasiae, a pseudo-fungus, that occurs in many taro producing areas, especially in the South West of Cameroon. A Survey was conducted to assess farmers’ knowledge, as well as to determine the incidence and the severity of the disease in taro fields. Structured questionnaires were administered in selected locations (Bokova, Ekona, Muea, Mile 16, Mutengene, and Likomba) of taro production. Two farms were selected with two quadrats of 64 m2 each were carved to assess disease incidence and severity on taro. The number of plants infected with taro leaf blight were counted and the area of the affected leaves measured was used to evaluate the disease incidence and disease severity. Data collected were subjected to ANOVA for complete randomized design and the means were compared using Tukey test at 0.05 probability levels. The results revealed that most of the farmers could identify the disease while practicing cultural methods in controlling the disease. The results also revealed significant differences (p = 0.001) in disease incidence and disease severity in all the localities, with Mile 16 showing the highest percentage mean of 96.53% and 85.59%, respectively. The severity scored showed high infection range of 3 – 3.95 in all locations except in Likomba (2.60).  It could be concluded from the results that there were high prevalence of taro leaf blight disease in Fako Division. Good management strategies are therefore required to control Taro leaf blight and improve taro production in the area.

scholarly journals SKRINING DAN IDENTIFIKASI ISOLAT BAKTERI ENDOFIT UNTUK MENGENDALIKAN PENYAKIT HAWAR DAUN BAKTERI PADA BAWANG MERAH

2013 ◽  
Vol 13 (2) ◽  
pp. 167-178
Author(s):  
Zurai Resti ◽  
Trimurti Habazar ◽  
Deddi Prima Putra ◽  
Nasrun Nasrun
Keyword(s):  
Bacillus Cereus ◽  
Endophytic Bacteria ◽  
Disease Incidence ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Bacillus Sp ◽  
In Planta ◽  
16S Rrna Sequence ◽  
Randomized Design ◽  
Blight Disease

Screening and identification of endophytic bacteria to control bacterial leaf blight disease on Shallot. The experiment was conducted in Laboratory and Green House, from January to June 2012.   Laboratory experiment consisted of three steps:  (1) isolation of endophytic bacteria from healthy onion roots, (2)In planta /screening of endophytic isolates capable of reducing bacterial leaf blight disease, and (3) molecular identification of potential endophytic isolates.  Treatments of  in planta test were arranged in Completely Randomized Design.  Collected isolates were tested for their capability in controlling bacterial leaf blight disease on shallot.  The variables observed were disease incidence, disease severity, and shallot yield. The results showed that out of 82 isolates successfully isolated, 56 isolates (68.29%) were Gram positive, and 26 isolate (31.71%) were Gram negative. All isolates were HR negative and pathogenicity negative. Six endophytic isolates showed  better performance in inducing resistance and increasing onion yield. Based on 16S rRNA sequence the six isolates were  Bacillus cereus strain P14 , Bacillus cereus strain Se07, Bacillus sp H1, Bacillus sp SJ1 and Serratia marcescens strain PPM4.

scholarly journals Efficacy of spraying intervals of Ridomil Plus 66 WP for control of taro leaf blight disease

1970 ◽  
Vol 29 (1) ◽  
pp. 133-140
Author(s):  
J. Adomako ◽  
N.E. Amengor ◽  
S. Larbi-Koranteng ◽  
F. Kankam
Keyword(s):  
Yield Loss ◽  
Disease Incidence ◽  
Economic Benefits ◽  
Weekly Interval ◽  
Leaf Blight ◽  
Total Revenue ◽  
Optimum Period ◽  
Blight Disease ◽  
Taro Leaf Blight ◽  
Biweekly Interval

Taro leaf blight causes up to 100% yield loss in susceptible taro (Colocasia esculenta L. (Schott)) cultivars. The use of fungicides in disease management is fast and effective; however efficacy of fungicides could be affected by frequency of application. The objective of this study was to evaluate the efficacy of spraying intervals and economic benefits of Ridomil Plus 66 WP (12% Metalaxyl-M and 60% Copper (1) oxide) on taro leaf blight disease. The study consisted of four fungicide spraying intervals, viz at one, two and at four weekly intervals, all at the concentration of 3.3 g l-1 and no fungicide application as the control. Results showed no significant differences (P > 00.5) between one and two weekly spraying intervals in terms of taro leaf blight disease incidence and severity. These were, however, significantly different (P < 0.05) from four weekly and no fungicide applications. Taro corm yield was higher in weekly spraying interval, but not significantly different (P > 0.05) from biweekly application intervals. Yields in weekly intervals were 2.9, 33.0 and 44.0% higher than biweekly, four weekly and no application intervals. Applying fungicide at a biweekly interval was found to be economically efficient as it recorded higher total revenue and net present values. Applying 66 WP (12% Metalaxyl-M and 60% Copper (1) oxide) at 2 weekly interval was the optimum period and most efficient to reduce the incidence and severity of Phytophthora leaf blight disease and increase yield of taro.

Uji Resistensi Beberapa Klon Kentang Terhadap Penyakit Hawar Daun (Phythopthora infestans)

2019 ◽  
Vol 16 (1) ◽  
Author(s):  
Rudy Madiyanto ◽  
Suryantini Ekananda ◽  
Anton Gunarto
Keyword(s):  
Group Treatment ◽  
Disease Incidence ◽  
Leaf Blight ◽  
The Other ◽  
Resistant Clone ◽  
Potato Clone ◽  
New Varieties ◽  
Late Blight Disease ◽  
Blight Disease ◽  
Important Disease

One of the important disease on potato late blight disease is caused by a fungus Phythopthora infestans (Mont.) de Bery. Damage by leaf blight disease can lead to decrease in the yield between 10-100%. The purpose of this study is to get 27 new varieties of potato clone accession numbers from crosses that have resistance to leaf blight disease Phythopthora infestans (Mont.) de Bery. Design Randomized trial method using group, treatment consisted of 27 clones of potato varieties from crosses with three comparators are Granola, Atlantic and Jasper. Was repeated twice. The results showed that the magnitude of the intensity of the attack on the last observation is converted to the level of resistance is known from 27 potato clones from crosses that were tested, there were six resistant clones that include the PT-04, AP-03, PT-03, AP-04, AP-07 and PT-02 with disease incidence between 9.70 to 18.33%, the four clones is somewhat resistant clone PT-01, PT-06, AP-08 and AP-02 with disease incidence between 20.48 to 37.50 %, while the other clones is somewhat fragile and susceptible to disease Phythopthora infestans (Mont.) de Bery.Salah satu penyakit penting pada kentang adalah penyakit hawar daun yang disebabkan oleh jamur Phythopthora infestans (Mont.) de Bery. Kerusakan oleh penyakit hawar daun ini dapat mengakibatkan penurunan hasil antara 10-100%. Tujuan penelitian ini adalah mendapatkan varietas baru dari 27 nomor aksesi klon kentang hasil persilangan yang memiliki ketahanan terhadap penyakit hawar daun Phythopthora infestans (Mont.) de Bery. Metode percobaan menggunakan Rancangan Acak Kelompok (RAK), perlakuan terdiri dari 27 klon kentang hasil persilangan dengan tiga varietas pembanding yaitu Granola, Atlantik dan Jasper. Diulang sebanyak dua kali. Hasil penelitian menunjukkan bahwa dari besarnya intensitas serangan pada pengamatan terakhir yang dikonversikan ketingkat ketahanan diketahui dari 27 klon kentang hasil persilangan yang diuji, terdapat enam klon yang termasuk resisten yaitu PT-04, AP-03, PT-03, AP-04, AP-07 dan PT-02 dengan kejadian penyakit antara 9,70-18,33 %, empat klon agak resisten yaitu klon PT- 01, PT-06, AP-08 dan AP-02 dengan kejadian penyakit antara 20,48-37,50 %, sedangkan klon lainnya agak rentan dan rentan terhadap penyakit Phythopthora infestans (Mont.) de Bery.Keywords: resistance, Phythopthora infestans (Mont.) de Bery, potato clone.

scholarly journals Leaf Blight Disease caused by Pseudomonas syringae pv. syringae in the Nurseries of Litchi (Litchi chinensis Sonn.) and its Management

2017 ◽  
Vol 15 (1) ◽  
pp. 10-18
Author(s):  
MAH Khan ◽  
I Hossain ◽  
MU Ahmad ◽  
MSM Chowdhury
Keyword(s):  
Disease Severity ◽  
Pseudomonas Syringae ◽  
Copper Sulphate ◽  
Disease Incidence ◽  
Foliar Spray ◽  
Antibiotic Sensitivity ◽  
Weather Conditions ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Blight Disease

Leaf blight of seven varieties of litchi caused by Pseudomonas syringae pv. syringae was surveyed in the nurseries of major litchi growing areas in Bangladesh viz. Rajshahi, Dinajpur, Rangpur, Mymensingh and Khagrachari. The mean level of incidence and severity were 8.58 and 7.88% in Rajshahi, 9.88 and 8.88% in Dinajpur, 8.44 and 7.76% in Rangpur, 6.50 and 6.18% in Mymensingh and 9.00 and 7.98% in Khagrachari. Incidence and severity of bacterial leaf blight disease of litchi varied significantly depending on weather conditions. Correlation studies revealed that bacterial leaf blight disease of litchi seedlings were positively correlated with temperature, rainfall and relative humidity, where temperature and rainfall was the major factor to the variations of both incidence and severity. Antibiotic sensitivity test revealed that among fifteen isolates, most of the isolates of P. syringae pv. syringae collected from litchi were sensitive to Gentamycin and Erythromycin. Under net house condition, six different treatments (i) Gentamycin @ 0.05%, (ii) Erythromycin @ 0.05%, (iii) Doxycycline @ 0.05%,(iv) Copper sulphate @ 0.05%, (v) BAU-Biofungicide @ 2% and (vi) Control were used for controlling bacterial leaf blight of litchi (Variety: China-3). BAU-Biofungicide was found to be superior in controlling bacterial leaf blight of litchi that reduced 33.64% disease incidence and 60.77 % disease severity in 2010-11 and 63.76% disease incidence and 61.40 % disease severity in 2011-12 over control when applied as foliar spray @ 2% followed by Copper sulphate (0.05%) and Erythromycin (0.05%).The Agriculturists 2017; 15(1) 10-18

scholarly journals Response of cotton genotypes against the incidence of Alternaria leaf blight of cotton under field conditions

2021 ◽  
Vol 42 (4) ◽  
pp. 1002-1007
Author(s):  
G. Rajesha ◽  
◽  
S. Nakkeeran ◽  
T. Indumathi ◽  
P. Adhipathi ◽  
...  
Keyword(s):  
Disease Incidence ◽  
Block Design ◽  
Disease Index ◽  
Leaf Blight ◽  
Field Conditions ◽  
Breeding Lines ◽  
Alternaria Leaf Blight ◽  
Resistant Reaction ◽  
Blight Disease ◽  
Cent Disease

Aim: To identify the resistant source present in the breeding materials against Alternaria leaf blight disease of cotton (Gossypium spp.). Methodology: Breeding entries were sown in a randomized complete block design in the experimental site. Disease intensity on each genotype at 45, 90, 135 and 180 days after sowing (DAS) were recorded from leaves of lower, middle and upper parts of plants and graded. According to 0 - 4 disease scoring scale, per cent disease index (PDI) was calculated and genotypes were categorized into different categories based on disease reaction Results: Development of Alternaria disease was noticed at early days of crop growth in few genotypes and the disease increased upto 135 days after sowing. The maximum mean per cent disease index of 41.17 and 40.06 were recorded in Br.14a (ZT)1333 and Br.14a (ZT)1332 respectively. The least PDI of 0.58 was recorded in Br.03a (ZT)1303. Disease incidence of <11.00% of was reported in 37 entries at 45 days after sowing. None of the genotypes showed apparently immune reaction, twenty-one genotypes showed resistant reaction, eleven genotypes were moderately resistant and five showed moderately susceptible reaction. Interpretation: Twenty-one breeding lines showed resistant reaction against Alternaria leaf blight disease under field conditions, however, further utilization of these lines may be carried out in breeding programmes for the development of resistant source against this disease.

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