scholarly journals Compatibility of Mancozeb 75 WP with some plant extracts in the integrated management of Cercospora leaf spot disease of okra (Abelmoschus esculentus (L.) Moench)

2020 ◽  
Vol 55 (2) ◽  
pp. 26-38
Author(s):  
V.O. Dania ◽  
N. E. Sam
Keyword(s):  
Leaf Spot ◽  
Sandy Loam ◽  
Integrated Management ◽  
Disease Incidence ◽  
Block Design ◽  
Foliar Spray ◽  
Leaf Spot Disease ◽  
Syzygium Aromaticum ◽  
Cercospora Leaf Spot ◽  
Combined Application

The use of synthetic mancozeb fungicide has not been effective in the control of okra leaf spot (Pseudocercospora abelmoschi) disease amidst critical issues of environmental concerns. Therefore, this study evaluated the compatibility of mancozeb 75 WP with some botanicals in the integrated management of the disease. Laboratory assay was a 3×4×2 factorial laid out in a completely randomized design with three replications, while the field experiment was a randomized complete block design with 14 treatments. Four extract concentrations, 15, 30, 45 and 50% w/v and 0.5 g/l Mancozeb 75 WP were evaluated. The application of Syzygium aromaticum extract at 50% w/v concentration had the highest mycelial growth reduction of 71.89% of the pathogen. The soil textural class was sandy loam and treatments effect on okra growth indices did not differ significantly (p>0.05). The highest pod yield of 15.48 t/ha-1 was obtained in treatment inoculated with P. abelmoschi. but treated with a combination of S. aromaticum and Mancozeb. The same treatment had the lowest disease incidence of 4.01%, while combined application of C. papaya, S. aromaticum and Mancozeb recorded significantly (p<0.05) lower disease severity among inoculated plants. Therefore, this combination is recommended as foliar spray on okra in place of Mancozeb.

scholarly journals Efficacy of fungicides in control of turmeric leaf spot caused by Colletotrichum capsici at Tepi, Southwestern Ethiopia

2021 ◽  
Vol 36 (3) ◽  
pp. 119-124
Author(s):  
Merga Jibat ◽  
Mulukan Asfaw
Keyword(s):  
Field Experiment ◽  
Leaf Spot ◽  
Agricultural Research ◽  
Disease Incidence ◽  
Block Design ◽  
Foliar Spray ◽  
Cost Benefit ◽  
Leaf Spot Disease ◽  
Colletotrichum Capsici ◽  
Southwestern Ethiopia

Turmeric leaf spot, caused by the pathogen Colletotrichum capsici, is the greatest damaging disease that limits the production and productivity of turmeric, and reduces qualitative and quantitative rhizome yields in Southwestern Ethiopia. A field trial was conducted to evaluate the efficacy of different fungicides against a disease epidemic of turmeric leaf spot in Southwestern Ethiopia. The field experiment was performed at Tepi Agricultural Research Center during the 2019 and 2020 main cropping seasons using four fungicides: Ethiozeb 80% WP (mancozeb), Prozole 255 EC (propiconazole), Mancolaxyl 72% WP (mancozeb + metalaxyl) and Ridomil Gold MZ 68 WG (metalaxyl-M), which were applied either as seed rhizome treatments plus foliar spray, or as foliar spray alone for control of leaf spot infection. The field experiment was laid out in a randomized complete block design with nine treatments and three replications. The results of the experiment indicated that both rhizome treatment + foliar spray, and foliar fungicide spray treatments significantly affected the turmeric leaf spot epidemics. The effect of the foliar spray Prozole 255 EC (propiconazole) was significantly higher than the other treatments in reducing disease severity (27.0) and maximizing rhizome fresh yield (34.1 ton/ ha). The maximum cost benefit ratio (1:2.65) was achieved by the foliar spray fungicide Prozole 255 EC (propiconazole). Amongst different fungicides considered, the foliar spray Prozole 255 EC (propiconazole) reduced leaf spot disease incidence up to 47.1% over the control on the last day of disease evaluation. The whole outcome of this experiment showed that foliar Prozole 255 EC (propiconazole) fungicide sprays were effective in alleviating the epidemic of turmeric leaf spot and boosting turmeric production and productivity.

scholarly journals Evaluation of garlic, BAU-biofungicide, bion and chemical fungicides in controlling leaf spot of Taro

2017 ◽  
Vol 28 (3) ◽  
pp. 167-173
Author(s):  
MAS Sohag ◽  
MT Hossen ◽  
MS Monjil
Keyword(s):  
Field Experiment ◽  
Plant Height ◽  
Leaf Spot ◽  
Disease Incidence ◽  
Foliar Spray ◽  
Leaf Spot Disease ◽  
Spot Disease ◽  
Maximum Reduction ◽  
Before And After ◽  
Chemical Fungicides

The field experiment was conducted to evaluate the efficacy of Garlic extract @ 10%, BAU-Biofungicide @ 2%, Bion@ 0.2%, Bavistin DF (Carbendazim) @ 0.1% and Proud 250EC (Propiconazole) @ 0.1%  for controlling leaf spot disease of taro (Colocasia esculenta). Performance of these treatments was assessed by applying as cormel treatment and foliar spray. Cormel treatment under field experiment was found effective for BAU-Biofungicide and Proud 250EC. Bavistin DF and Proud 250EC was more effective than other treatments in increasing plant height and healthy leaves, and in decreasing spotted and dead leaves. Before foliar spraying, BAU-Biofungicide as cormel treatment reduced the disease incidence (46.19%) and severity (25.28%) of taro leaf spot at 180 days after sowing. As foliar spray all the treatments has significant effect on taro leaf spot. Among the treatments BAU-Biofungicide was found superior to control leaf spot of taro. BAU-Biofungicide resulted maximum reduction of disease incidence and severity and increase in number of healthy leaf followed by Bion and Proud 250EC. BAU-Biofungicide showed enhanced results in terms of disease incidence and severity of leaf spot of Taro before and after foliar spraying.Progressive Agriculture 28 (3): 167--173, 2017

scholarly journals Survey on Nigerian Castor Germplasm for Potential Resistant Genotypes to Cercospora Leaf Spot

2019 ◽  
Vol 11 (3) ◽  
pp. 440-446
Author(s):  
Bolaji Zuluqurineen SALIHU ◽  
Mathew Omoniyi ADEBOLA ◽  
Maryam Alfa KABARAINI ◽  
Sunkanmi Tokunbo GBADEYAN ◽  
Adijat Abolore AJADI ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Disease Incidence ◽  
Block Design ◽  
Damage Index ◽  
Principal Component ◽  
Average Score ◽  
Economic Damage ◽  
Limiting Factor ◽  
Cercospora Leaf Spot ◽  
Resistant Genotypes

Fungal diseases cause a lot of economic damage in castor and in some instances; it is a limiting factor to commercial cultivation of the crop. In the present study, survey on castor germplasm for sources of resistant genes to Cercospora leaf spot was carried out at National Cereals Research Institute Badeggi, Nigeria. The genotypes were grown in a resolvable incomplete block design with three replications. The results obtained revealed high variability of host resistance among the genotypes. Percentage disease incidence ranged between 16.67% and 100%.  A range between 1.43 score and 4.17 scores with average score of 2.89 were recorded for disease severity among the genotypes. Highest (95.92%) and lowest (13.03%) damage index were observed in the genotypes Acc. 059 and Acc. 022 respectively. The Principal component (PC) 1 to 4 explained 100% of the variability in the germplasm. PC1 explained 69.72% of the variability with the major contributory parameters being the disease incidence, severity and damage index. Significant negative correlations were recorded between the seed yield and all the three disease indices. The result of cluster analysis revealed six cluster groups among the germplasm with cluster membership ranging between 4 and 40 members. The cluster I contained members (Acc. 002, Acc. 017, Acc. 022, Acc. 026, Acc. 027, Acc. 048 and Acc. 061) with low average disease incidence, severity and damage index. The results reported here could serve as a basis for further screening of the potential resistant genotypes under controlled condition to develop resistant lines.

scholarly journals Management of Cercospora leaf spot disease of urdbean

2021 ◽  
Vol 17 (2) ◽  
pp. 350-353
Author(s):  
Smita Tiwari ◽  
M.P. Dubey ◽  
P.K. Mishra
Keyword(s):  
Disease Severity ◽  
Leaf Spot ◽  
Foliar Spray ◽  
High Yield ◽  
Leaf Spot Disease ◽  
Cercospora Leaf Spot ◽  
Spot Disease ◽  
Highly Effective

For the management of Cercospora leaf spot of urdbean, seven new fungicides were tested for two year during 2018 and 2019. Of all the chemical tested, foliar spray with Azoxystrobin 8.3% + Mancozeb 66.7% WG and foliar spray with Carbendazim 12% + Mancozeb 63% WP were highly effective and provided less disease severity and high yield of urdbean crop.

scholarly journals Incidence of Cercospora Leaf Spot Disease of Groundnut (Arachis hypogaea L.) As Influenced by Sowing Date in Makurdi, Benue state of Nigeria.

2019 ◽  
Vol 7 (4) ◽  
Author(s):  
Richard Isa Bwala ◽  
Chigoziri Ekhuemelo ◽  
Dauda Zacharia
Keyword(s):  
Leaf Spot ◽  
Seed Weight ◽  
Disease Incidence ◽  
Sowing Date ◽  
Leaf Spot Disease ◽  
Cercospora Leaf Spot ◽  
Spot Disease ◽  
Sowing Dates ◽  
Red Variety ◽  
100 Seed Weight

Leaf spots of groundnut caused by Cercospora spp is one of the major economic production constraint militating against groundnut production in Nigeria.  Field experiments were conducted during the 2011 and 2012 seasons at the Teaching and Research Farm of the Federal University of Agriculture, Makurdi Nigeria  to assess the effect of sowing dates on the incidence of Cercospora leaf spot of groundnut The 2 x 4 x 3 factorial (2 groundnut varieties/ 4 sowing dates/ 3 replications) experiment was laid out in a Randomized Complete Block Design (RCBD) and replicated three times. Results indicated no significant effect of Cercoscora leaf spot on the two varieties in 2011 but in Ex-Dakar recorded a significantly (P < 0.05) higher leaf spot incidence compared Borno-Red variety.  Sowing groundnut seeds in 14th June to 29th June recorded significantly higher (P < 0.0) leaf spot disease incidence compared with sowing groundnut seeds in May. Ex-Dakar variety recorded higher leaf defoliation compared with Borno-Red variety in 2012 and 2012 seasons. Results indicated that Borno-Red had a significantly (P < 0. 05) higher 100 seed weight in 2011, while Ex-Dakar recorded higher 100 seed weight in 2012. The results has proved that early sowing of groundnut in May can be employed as alternative strategy for the management of leaf spot disease of groundnut in Makurdi, NigeriaKey word: Groundnut, disease incidence, sowing date, leaf defoliation, leaf spot.

Management of Cercospora Leaf Spot of Mungbean [Vigna radiata (L.) Wilczek] using Fungicides and Host Resistance in Bundelkhand Region of Uttar Pradesh, India

2021 ◽  
Author(s):  
Durga Prasad ◽  
Kshitij Gupta ◽  
Virendra Pratap Singh
Keyword(s):  
Leaf Spot ◽  
Management Strategy ◽  
Insect Pests ◽  
Disease Incidence ◽  
Uttar Pradesh ◽  
Leaf Spot Disease ◽  
Yield Losses ◽  
Cercospora Leaf Spot ◽  
Efficient Management ◽  
Cropping Seasons

Background: The pulses are important crop of Bundelkhand region of Uttar Pradesh. Among the pulses, mungbean is an important. Despite the multifaceted importance of this crop, its production could not be stabilized in the Uttar Pradesh as well as in the country due to several biotic constraints like diseases and insect-pests leading to considerable yield losses. Among several diseases affecting mungbean, cercospora leaf spot (CLS) caused by Cercospora canescens Ellis and Martin is one of the most important fungal diseases occurring regularly in the mungbean growing areas during the warm and humid weather. Methods: Experiments were conducted during two cropping seasons i.e. Kharif 2019 and 2020 to find out an efficient management strategy for this disease. In first experiment, 9 fungicides were assessed against CLS during both the seasons. In second experiment, 200 germplasm of mungbean were evaluated for resistance against cercospora leaf spot. Result: Among nine different fungicide treatments evaluated individually and as well as in combinations, spraying Carbendazim twice after first appearance of symptoms and second at 15 days’ interval, gave maximum reduction in the incidence and severity of Cercospora leaf spot i.e. 45.57% and 58.45%, respectively along with significant enhancement (53.39%) in grain yield over the unprotected crop followed by treatment with Carbendazim + Mancozeb which resulted in 35.44% and 52.65% reduction in incidence and severity respectively and 44.88% enhancement in yield. Treatment with Captan + Hexaconazole was found to be least effective to reduce the disease incidence/ severity as well as to increase the crop yield. In second field experiment out of 200 mungbean genotypes evaluated against cercospora leaf spot during two consecutive crop seasons, four genotypes viz., PDM 04-123, PDM 54, EC520034-1 and EC 520022 were found to be resistant against cercospora leaf spot disease.

scholarly journals Suppression of Septoria Leaf Spot Disease of Tomato Using Aerated Compost Tea

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 831D-831
Author(s):  
Chandrappa Gangaiah* ◽  
Edward E. Carey ◽  
Ned A. Tisserat
Keyword(s):  
Leaf Spot ◽  
Disease Incidence ◽  
Foliar Spray ◽  
Plant Diseases ◽  
Leaf Spot Disease ◽  
Compost Tea ◽  
Plastic Mulch ◽  
Tomato Cultivar ◽  
Spot Disease ◽  
Septoria Leaf Spot

Compost teas, made using an aerated brewing process, have been reported to have potential for controlling a range of plant diseases and improving crop health. Septoria leaf spot of tomato, caused by the fungus Septoria lycopersici, is a common and destructive disease of tomato in Kansas. A field trial was conducted at Wichita, Kansas during Summer 2003 to evaluate the potential of pre-plant compost, and compost tea applied as a foliar spray or through drip fertigation, to control Septoria leaf spot of tomato. The experimental design included three factors: Pre-plant application of 13N-13P-13K or vermicompost; fertigation with CaNO3 or compost tea; and foliar spray with compost tea, fungicide (Dithane) or water. A split plot design was used with fertigation treatments as main plots and the other two factors as sub-plots. There were 3 replications. Tomato cultivar Merced was used and individual plots consisted of 5 plants grown on beds covered with red plastic mulch and supported by stake and weave system. Aerated compost tea was brewed weekly using a vermicompost-based recipe including alfalfa pellets, molasses, humic acid, fish emulsion and yucca extract and applied to plots starting 2 weeks after transplanting. Disease incidence and severity were recorded weekly for 3 weeks following the appearance of disease. Plots were harvested twice weekly and counts of No. 1, No 2 and cull grade tomatoes were recorded. There were no effects of pre-plant or fertigation treatments on Septoria leaf spot disease, but there was a significant effect due to foliar sprays, with mean severity of compost-tea-sprayed plots (26.3%) and fungicide-sprayed plots (31.9%) significantly lower than water-sprayed plots (45.9%) at trial termination.

scholarly journals Evaluation Of Different Concentrations Of Mancob M For The Control Of Cercospora Leaf Spot (Cercospora Sesami Zimm) On Some Sesame Varieties In Yola, Nigeria

2019 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Field Experiment ◽  
Laboratory Experiment ◽  
Leaf Spot ◽  
Disease Incidence ◽  
Block Design ◽  
Mean Value ◽  
Cercospora Leaf Spot ◽  
Plot Size ◽  
Randomized Complete Block Design ◽  
Disease Parameters

Diseases pose serious constraints to Sesame production in producing areas. Cercospora leaf spot (Cercospora sesami Zimm) has been identified as one of the most prevalent diseases which is to be controlled by Mancob M fungicide. The field experiment was carried out using a Randomized Complete Block Design and was replicated three times on a plot size of 4m x 5m with four sesame varieties and three Mancob-M fungicide levels (0, 2 and 4g) to give a total of twelve treatments. The laboratory experiment involved isolation of the pathogens from diseased leaves with symptoms of Cercospora leaf spot which was identified as Cercospora sesami. Data collected includes growth and disease parameters. The result revealed that 4g Mancob M recorded the lowest mean value for disease incidence and severity at 8WAS which was 90.30% and 35.60% respectively, while the control (0g) recorded the highest mean value for disease incidence and severity at 90.30% and 59.80% respectively. Ex-sudan recorded the lowest value of 720 kg/ha while NCRIBEN 03 recorded the highest yield of 834 kg/ha-1. For the concentrations, 2g recorded a higher yield of 843 kg/ha-1 followed by 0g which recorded 765 kg/ha-1. Variety E8 has a higher resistance to the disease while NCRIBEN 03 tends to be more susceptible but gave a higher yield. It therefore implies that variety E8 which showed higher resistance to the disease can be merged with NCRIBEN 03 (through hybridization) to produce a much better variety.

Alternaria and Cercospora Leaf Spot Diseases of Niger (Guizotia abyssinica Cass.) – A Traditional Tribal Crop of South Gujarat, India, with Cost Benefit Ratio in Relation to Different Fungicides

2018 ◽  
Vol 51 (3) ◽  
pp. 89-99
Author(s):  
P.B. Sandipan ◽  
P.K. Jagtap ◽  
M.C. Patel
Keyword(s):  
Field Experiment ◽  
Seed Yield ◽  
Leaf Spot ◽  
Foliar Spray ◽  
Cost Benefit ◽  
Research Station ◽  
Guizotia Abyssinica ◽  
Cercospora Leaf Spot ◽  
Benefit Ratio ◽  
Cost Benefit Ratio

Abstract Niger (Guizotia abyssinica Cass.) is an important minor oil seed crop grown in dry areas grown mostly by tribal and interior places as life line of tribal segment. Tribal people mainly use its oil for cooking purpose, above than that there were also other uses. Hence, the niger crop should be protected from the infection. The crop is affected by number of fungal diseases. Therefore, a field experiment was formulated for three years with the four replications at the Niger Research Station (NRS) at Navsari Agricultural University (NAU), Vanarasi, Navsari (Gujarat) on the foliar diseases of GN-1 variety of niger crop. In this experiment, six different fungicides along with one control have been evaluated to control the Alternaria and Cercospora leaf spot diseases, out of which all the fungicidal treatments were significantly superior over the control. Here, foliar spray on the incidence of diseases was compared with the control (without any treatment). All the fungicidal treatments were significantly superior over the control to reduce Alternaria and Cercospora leaf spot diseases of Niger crop. Treatment of Carbendazim + Mancozeb (0.2 %) with two sprays first from the initiation of the disease and second after the interval of 15 days recorded the lowest incidence of Alternaria (14.56) and Cercospora (14.94) leaf spot diseases of niger and recorded the highest seed yield 337 seed yield kg/ha along with the net return with cost benefit ratio graph.

Sign in / Sign up

Export Citation Format

Share Document