Efficacy of fungicides in controlling late blight of potato

2015 ◽  
Vol 26 (2) ◽  
pp. 103-108
Author(s):  
MM Anwar ◽  
A Parveen ◽  
MM Hossain ◽  
NU Mahamud ◽  
RK Roy
Keyword(s):  
Late Blight ◽  
Tuber Yield ◽  
Cultural Practices ◽  
Disease Incidence ◽  
Integrated Approach ◽  
Control Treatment ◽  
Commercial Potato ◽  
Late Blight Disease ◽  
Blight Disease ◽  
Late Blight Of Potato

Potato cultivars grown in Bangladesh have low levels of general resistance to late blight. As such, most commercial potato farmers rely on fungicide applications for control of Phytophthora infestans, the causal agent of late blight. Management of late blight of potato requires an integrated approach that includes rotation with non-hosts, resistant cultivars, cultural practices, and fungicides. The study on efficacy of some new fungicides against late blight disease of potato was conducted at ARS, Alamnagar Rangpur during rabi season 2010-2011 to select suitable fungicides against late blight of potato. Thirteen different fungicides were tested and all the tested fungicides showed significantly better performance over control. Considering percentage disease incidence T4,T6 and T12 showed better performance than all other treatment. In case of T4,T6 and T12 treatment disease reduction was more than 80 % over control. Significantly the highest tuber yield 25.5 t ha-1was obtained from T3  which was statistically similar to the yield of T2,T5 , T6, T9, T10, T11and T12  treatment whereas the lowest tuber  yield 14.5 t ha-1 was obtained from control treatment. Field experiment was conducted from 2010 to 2011 to investigate the comparative efficacy of the fungicides. In the field, applications of fungicide that preceded the largest incremental increase in disease incidence provided the best control of disease or increased yield.Progressive Agriculture 26 (2): 103-108, 2015

Light-induced alteration of leaf sterol content and late blight disease development in tomato

1982 ◽  
Vol 60 (12) ◽  
pp. 2724-2728 ◽  
Author(s):  
B. Bradford ◽  
L. D. Moore ◽  
D. M. Orcutt
Keyword(s):  
Light Intensity ◽  
Late Blight ◽  
Disease Incidence ◽  
Total Sterol ◽  
Disease Development ◽  
Low Light ◽  
Light Intensities ◽  
Intensity Changes ◽  
Late Blight Disease ◽  
Blight Disease

‘Nova’ and 'Beefsteak,' cultivars of tomato (Lycopersicon esculentum Mill.), were grown in chambers under light intensities of 240 or 120 μE∙m−2∙s−1. Thirty-five days after seeding, half of the tomato plants were harvested for sterol analysis and the others were inoculated with a tomato race O isolate of Phytophthora infestons (Mont.) de By. Late blight symptoms were assessed 10 days after inoculation from the number of leaves showing disease (disease incidence) and the amount of blighted area of each leaf (percent colonization). Disease incidence and percent colonization were not influenced by light intensity with 'Nova' plants, but 'Beefsteak' plants grown under low light were significantly [Formula: see text] more diseased than those exposed to the higher light intensity. Changes in free sterol, steryl ester, and total sterol concentrations between plants grown under different light intensities were similar for both cultivars. A significant decrease in the steryl glycoside concentration of low light grown 'Beefsteak' plants correlated with increased disease incidence. The possible role of steryl glycosides and their derivatives in late blight disease development is discussed.

scholarly journals Eco-friendly management of late blight of potato– A review

2017 ◽  
Vol 9 (2) ◽  
pp. 821-835
Author(s):  
Shailbala Shailbala ◽  
Amarendra Kumar
Keyword(s):  
Late Blight ◽  
Mycorrhizal Fungi ◽  
Cultural Practices ◽  
Potato Crop ◽  
Rapid Development ◽  
Management Strategies ◽  
Irish Famine ◽  
Forecasting System ◽  
Blight Disease ◽  
Late Blight Of Potato

 Late blight of potato caused by fungus Phytophthora infestans responsible for Irish famine in the year 1845, is one of the most dramatic episode caused by plant pathogen in human history. One million people died due to famine in Ireland. So eco-friendly management of potato late blight disease is a necessary goal to be accomplished.During last many years, management strategies solely relied upon the application of fungicides due to rapid development of late blight epidemics. However, indiscriminate use of fungicide posesses a serious threat to the environment and human health. It is also responsible for built up of resistance in the pathogen and have adverse effect on beneficial organisms such as nitrogen fixers, resident antagonism and mycorrhizal fungi. So to minimize the fungicide use, eco-friendly means for late blight management are required on a priority basis. In recent years, significant changes in isolates of late blight fungus have been recorded including changes in aggressiveness to the crop also. Since, late blight is a community disease so, effective eco-friendly management must be adopted by the all producers, farmers, gardeners and growers with the help of government agencies, extension specialist and crop consultants etc. The strategy to control late blight is the prevention of establishment of Phytophthorainfestans in potato crop. In this context, disease management by cultural practices is the first line of defense while forecasting system, physiological strategies, biological control, host plant resistance and bio-technological approach are essential for efficient, effective and eco-friendly management of late blight of potato.

scholarly journals Efficacy of Mancozeb and Ocimum gratissimum Extract in the Management of Late Blight Disease in Tomato Varieties

2020 ◽  
pp. 45-53
Author(s):  
Manju Evelyn Bi ◽  
Ache NehTeke ◽  
Nkwatoh Therese Ncheuveu ◽  
Bih Nadine Toh
Keyword(s):  
Late Blight ◽  
Disease Incidence ◽  
Block Design ◽  
Rio Grande ◽  
Fruit Weight ◽  
Ocimum Gratissimum ◽  
Randomized Block Design ◽  
Significant Difference ◽  
Late Blight Disease ◽  
Blight Disease

Tomato late blight is an economic disease that causes 100 % yield loss of tomato in Cameroon. The objective of the study was to determine the efficacy of mancozeb and Ocimum gratissimum extract in managing late blight disease in Nadira and Rio-grande tomato varieties. Seedlings of each tomato variety were planted in replicates of three in a complete randomized block design comprising of three treatments (T1 –Ocimum gratissimum extract (1666.7 g/15 L); T2 –Mancozeb (50 g/15 L); T3 –control. Fifty grams of mancozeb (50g) and 1666.7 g of O. gratissimum extract dissolved and mixed with water in a 15 L knapsack sprayer was applied to control tomato late blight from the onset of blight symptoms, at two days intervals, to control Data for the disease incidence, severity, and yield parameters were collected at weekly intervals for four weeks from plants in the middle of the ridges.  Mancozeb and O. gratissimum extract significantly reduced the disease severity of  Nadira and Rio-grande tomato varieties by 0.2., resulting in a mean fruit number of 18.31 and 16.31 fruits and fruit weight of 1.44 g and 1.13 g. There was no significant difference (p =0.05) between plants sprayed with Mancozeb and O. gratissimum extract. The Nadira variety was resistant to the tomato late blight caused by Phytophthora infestans. Thus biopesticides (O. gratissimum) can be effectively used as alternatives to synthetic fungicides (mancozeb) –which pose risks to human and environmental health.

scholarly journals Response of Local Potato Cultivars to Late Blight Disease (Phytophthora infestans (Mont.) de Bary) under Field Conditions

2020 ◽  
Vol 3 (1) ◽  
pp. 28-37
Author(s):  
Rishav Pandit ◽  
Ravi Bhatta ◽  
Pooja Bhusal ◽  
Basistha Acharya ◽  
Subash Subedi ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Disease Incidence ◽  
Block Design ◽  
Potato Cultivar ◽  
Late Blight Resistance ◽  
Potato Cultivars ◽  
Late Blight Disease ◽  
Blight Disease ◽  
Moderately Resistant

Developing host resistance is an economic and long-term approach to disease management; however, resistance reactions that differ depending on the genotypes. Potato late blight is the devastating disease caused due to Phytophthora infestans (Mont.) de Bary.  In order to identify late blight resistance in potato genotypes, seven local potato cultivars (Bardiya Rato Local, Bardiya Seto Local, Cardinal, Deukhuri Rato Local, Deukhuri Seto Local, Kailali Local and Khumal Ujjowal) were evaluated in randomized complete block design (RCBD) with three replications during October 2018 to January 2019 on naturally infested soils in Deukhuri, Dang, Nepal. Results showed that significantly the highest disease incidence (99.17%), and the highest disease severity (88%) were found on Cardinal followed by Deukhuri Rato Local (64%), and Deukhuri Seto Local (60%). Potato cultivar namely Khumal Ujjowal was moderately resistant, whereas Deukhuri Rato local and Deukhuri Seto Local were susceptible to late blight disease. Significantly the highest yield (12.67 t ha-1) was produced by Khumal Ujjowal followed by Bardiya Rato Local (10.78 t ha-1) and Bardiya Seto Local (9.40 t ha-1). The disease incidence and Area under disease progressive curve (AUDPC) value was negatively co-related with the tuber yield. The potato cultivar Khumal Ujjowal followed by Bardiya Rato Local were found moderately resistant to late blight disease in Deukhuri conditions. This study suggests that potato cultivar Bardiya Rato Local can be grown for higher tuber production in Dang and similar topographic regions.

scholarly journals Response of Local Potato Cultivars to Late Blight Disease (Phytophthora infestans (Mont.) de Bary) under Field Conditions

2020 ◽  
Vol 3 (1) ◽  
pp. 28-37
Author(s):  
Rishav Pandit ◽  
Ravi Bhatta ◽  
Pooja Bhusal ◽  
Basistha Acharya ◽  
Subash Subedi ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Disease Incidence ◽  
Block Design ◽  
Potato Cultivar ◽  
Late Blight Resistance ◽  
Potato Cultivars ◽  
Late Blight Disease ◽  
Blight Disease ◽  
Moderately Resistant

Developing host resistance is an economic and long-term approach to disease management; however, resistance reactions that differ depending on the genotypes. Potato late blight is the devastating disease caused due to Phytophthora infestans (Mont.) de Bary.  In order to identify late blight resistance in potato genotypes, seven local potato cultivars (Bardiya Rato Local, Bardiya Seto Local, Cardinal, Deukhuri Rato Local, Deukhuri Seto Local, Kailali Local and Khumal Ujjowal) were evaluated in randomized complete block design (RCBD) with three replications during October 2018 to January 2019 on naturally infested soils in Deukhuri, Dang, Nepal. Results showed that significantly the highest disease incidence (99.17%), and the highest disease severity (88%) were found on Cardinal followed by Deukhuri Rato Local (64%), and Deukhuri Seto Local (60%). Potato cultivar namely Khumal Ujjowal was moderately resistant, whereas Deukhuri Rato local and Deukhuri Seto Local were susceptible to late blight disease. Significantly the highest yield (12.67 t ha-1) was produced by Khumal Ujjowal followed by Bardiya Rato Local (10.78 t ha-1) and Bardiya Seto Local (9.40 t ha-1). The disease incidence and Area under disease progressive curve (AUDPC) value was negatively co-related with the tuber yield. The potato cultivar Khumal Ujjowal followed by Bardiya Rato Local were found moderately resistant to late blight disease in Deukhuri conditions. This study suggests that potato cultivar Bardiya Rato Local can be grown for higher tuber production in Dang and similar topographic regions.

scholarly journals Masa Inkubasi Gejala Penyakit Hawar Daun Tanaman Kentang yang Diinduksi Ketahanannya oleh Jamur Antagonis Trichoderma viride

2016 ◽  
Vol 18 (2) ◽  
pp. 41
Author(s):  
Susiana Purwantisari ◽  
Achmadi Priyatmojo ◽  
Retno Peni Sancayaningsih ◽  
Rina Sri Kasiamdari
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Disease Incidence ◽  
Trichoderma Viride ◽  
Potato Late Blight ◽  
Biocontrol Agents ◽  
Trichoderma Spp ◽  
Late Blight Disease ◽  
Blight Disease

Late blight disease caused by Phytophthora infestans, is probably the single most important disease of potatoes worldwide. Infected plants were quickly killed and were difficult for replanting, causing significant losses for the growers. Various control methods were examined including the use of biocontrol agents of Trichoderma spp.  The biocontrol potential of Trichoderma viride against potato late blight pathogen, Phytophthora infestans, were studied  under greenhouse conditions. The research objective was to determine the ability of biocontrol agents Trichoderma viride to delay late blight disease incidence on potato plants in the field. The in vivo experiment was carried out at potato land area located at BALITSA in Cikole Sub District, Lembang District and Bandung Regency. Completely Randomized Design was used with six treatment and five replicates. The treatment tested consist of control (without pathogen fungal and antagonists fungus application too), control (with pathogen fungal application and without antagonist fungal application), chemical fungicide application, antagonist fungal application 2 weeks before planting, application 1 week after planting and both application 2 weeks before and 1 week after planting. Result of the research showed that application of antagonists fungal could delay disease intensity until 14 days. These antagonist could be used as biological agents initials to control leaf blight disease. Key words: Biological control, Potato late blight, Phytophthora infestans, Trichoderma viride

scholarly journals Severity of potato late blight under different weather conditions in Mymensingh region of Bangladesh

2020 ◽  
Vol 31 (2) ◽  
pp. 74-80
Author(s):  
MS Monjil ◽  
T Ulfat
Keyword(s):  
Relative Humidity ◽  
Late Blight ◽  
Soil Temperature ◽  
Dew Point ◽  
Disease Symptoms ◽  
Percent Relative Humidity ◽  
Late Blight Disease ◽  
Weather Parameters ◽  
Blight Disease ◽  
Late Blight Of Potato

An experiment has been conducted to observed the disease severity of late blight of potato in the different weather parameters viz., air temperature, soil temperature, dew points, percent relative humidity and period of sunshine. The experiment was conducted in the Net-house, Department of Plant Pathology, Bangladesh Agricultural University (BAU), Mymensingh during July 2016 to November 2017. Weather data were collected on daily basis from BAU weather station during the experimental period. A significant role of weather parameters was detected in disease development and disease progress. Temperature was strongly linked with the late blight infection in potato. From 15 December, 2016 to 12 January, 2017 air temperature was ranged from 21.00-23.50°C and soil temperature was ranged from 19.00-22.00°C, and this range late blight incidence was not detected in the potato plant. From 13-14 January air and soil temperature suddenly decreased 2°C and from next day again increased the temperature as well as starting late blight disease symptoms. It was observed that dew point and percent relative humidity have a big role on late blight disease severity of potato. In 13-14 January, 2017 dew point decreased from 14°C to 8°C and Percent RH decreased from 80% to 51%. From 14 January, 2017, disease symptoms were observed in potato leaves and rapidly increased. Thus, late blight of potato disease may respond to the variation of temperature, dew point and relative humidity. Progressive Agriculture 31 (2): 74-80, 2020

Evaluation of bio-agents and neem based products against late blight disease (Phytophthora infestans) of potato

2021 ◽  
Vol 74 (1) ◽  
pp. 181-187
Author(s):  
Mehi Lal ◽  
Sorabh Chaudhary ◽  
Sanjay Rawal ◽  
Sanjeev Sharma ◽  
Manoj Kumar ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Late Blight Disease ◽  
Blight Disease

Two new defensive constituents from potato tubers (Solanum tuberosum)

2017 ◽  
Vol 72 (6) ◽  
pp. 393-396
Author(s):  
Liangyan Liu ◽  
Jun Han ◽  
Yong Shen
Keyword(s):  
Solanum Tuberosum ◽  
Late Blight ◽  
Quantum Chemical ◽  
Spectroscopic Analysis ◽  
2D Nmr ◽  
Moderate Activity ◽  
Potato Tubers ◽  
Mycelia Growth ◽  
Late Blight Disease ◽  
Blight Disease

AbstractTwo new defensive constituents, solatuberenol A (1) and 3-O-β-d-glucopyranosyl stigmasta-5(6),24(28)-diene (2), were isolated from the potato tubers (Solanum tuberosum) infected with late blight disease. Their structures were identified by extensive spectroscopic analysis, including HRMS, IR, UV, 1D/2D NMR, ECD and quantum chemical calculations. Compounds 1 and 2 showed moderate activity against Phytophthora infestans with mycelia-growth inhibition of 30.1% and 52.4%, respectively, at the concentration of 500 ppm.

scholarly journals Phenotypic Characterization of Recent Clonal Lineages of Phytophthora infestans in the United States

Plant Disease ◽  
2013 ◽  
Vol 97 (7) ◽  
pp. 873-881 ◽  
Author(s):  
G. Danies ◽  
I. M. Small ◽  
K. Myers ◽  
R. Childers ◽  
W. E. Fry
Keyword(s):  
United States ◽  
Late Blight ◽  
Phytophthora Infestans ◽  
The United States ◽  
Phenotypic Characterization ◽  
Phenotypic Traits ◽  
Mating Types ◽  
Late Blight Disease ◽  
Blight Disease

Phytophthora infestans, the causal agent of late blight disease, has been reported in the United States and Canada since the mid-nineteenth century. Due to the lack of or very limited sexual reproduction, the populations of P. infestans in the United States are primarily reproducing asexually and, thus, show a simple genetic structure. The emergence of new clonal lineages of P. infestans (US-22, US-23, and US-24) responsible for the late blight epidemics in the northeastern region of the United States in the summers of 2009 and 2010 stimulated an investigation into phenotypic traits associated with these genotypes. Mating type, differences in sensitivity to mefenoxam, differences in pathogenicity on potato and tomato, and differences in rate of germination were studied for clonal lineages US-8, US-22, US-23, and US-24. Both A1 and A2 mating types were detected. Lineages US-22, US-23, and US-24 were generally sensitive to mefenoxam while US-8 was resistant. US-8 and US-24 were primarily pathogenic on potato while US-22 and US-23 were pathogenic on both potato and tomato. Indirect germination was favored at lower temperatures (5 and 10°C) whereas direct germination, though uncommon, was favored at higher temperatures (20 and 25°C). Sporangia of US-24 released zoospores more rapidly than did sporangia of US-22 and US-23. The association of characteristic phenotypic traits with genotype enables the prediction of phenotypic traits from rapid genotypic analyses for improved disease management.

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