scholarly journals Limitation in the use of spectral analysis to detect Weligama coconut leaf wilt disease affected palms in Southern Sri Lanka

COCOS ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 13 ◽  
Author(s):  
A. D. Nainanayake ◽  
J. Gunathilake ◽  
M. D. P. Kumarathunga ◽  
P. M. Gunawardena ◽  
H. T. R. Wijesekara
Keyword(s):  
Spectral Analysis ◽  
Sri Lanka ◽  
Wilt Disease

scholarly journals Analysis of Patterns of Pineapple Mealybug Wilt Disease in Sri Lanka

Plant Disease ◽  
1998 ◽  
Vol 82 (8) ◽  
pp. 885-890 ◽  
Author(s):  
G. Hughes ◽  
S. Samita
Keyword(s):  
Sri Lanka ◽  
Probability Distributions ◽  
Disease Incidence ◽  
Wilt Disease ◽  
Statistical Probability ◽  
Factors Affecting ◽  
Mealybug Wilt ◽  
Field Experimentation ◽  
Pineapple Mealybug Wilt ◽  
Made In

Mealybug wilt disease of pineapple has a complicated etiology, which is not yet fully understood. As a result, assessments of the disease in the field, such as those that are made in the context of evaluation of disease control methods, are usually based on symptomatology. Field assessments, based on symptoms of mealybug wilt disease, were made in the Kurunegala and Gampaha districts of Sri Lanka. These data were fitted to statistical probability distributions as a method of summarizing the spatial pattern of disease incidence. Most plots showed aggregated patterns of diseased plants, but there were some exceptions. Summarizing patterns of disease incidence by means of fitting statistical probability distributions provides a basis for significance testing in cases where factors affecting disease incidence are the subject of field experimentation. Some examples of this methodology are given.

Identification of Putative Vectors of Weligama Coconut Leaf Wilt Disease in Sri Lanka

2015 ◽  
pp. 137-146
Author(s):  
A. D. N. T. Kumara ◽  
L. Perera ◽  
M. K. Meegahakumbura ◽  
N. S. Aratchige ◽  
L. C. P. Fernando
Keyword(s):  
Sri Lanka ◽  
Wilt Disease

scholarly journals Detection of Weligama Coconut Leaf Wilt Disease Phytoplasma by Real-Time Polymerase Chain Reaction

CORD ◽  
2020 ◽  
Vol 36 ◽  
pp. 1-5
Author(s):  
H.T.R. Wijesekara ◽  
S.A.C.N. Perera ◽  
D. Bandupriya ◽  
M.K. Meegahakumbura ◽  
Lalith Perera
Keyword(s):  
Polymerase Chain Reaction ◽  
Sri Lanka ◽  
Disease Control ◽  
Real Time ◽  
Detection Rate ◽  
Control Program ◽  
Wilt Disease ◽  
Chain Reaction ◽  
Disease Control Program ◽  
Polymerase Chain

Weligama Coconut Leaf Wilt Disease (WCLWD) is a non-lethal, but debilitating phytoplasma disease found in coconut palms in Sri Lanka which is confined to the Southern Province of the country, well-away from the major coconut growing area. If it spreads to the major coconut growing area, it might severely damage the coconut industry in Sri Lanka. Government commenced a disease control program to eradicate the disease and, more importantly to prevent spreading of the disease to major coconut growing areas. The major constraint in this program is the lack of an accurate and reliable method for identifying affected palms. Visual symptoms are used to identify the affected palms for removal, yet growers are not always convinced of the method of resisting palm removal. This poses a serious threat to the implementation of the disease control program. Although a Nested-PCR-based disease diagnosis was established earlier, the detection rate and reliability need further improvements. Therefore, an urgent necessity for a more reliable disease detection method has arisen. In the current study, a Real-Time Polymerase Chain Reaction (qPCR) powered by a pair of primers and a probe designed from the published partial sequences of the WCLWD phytoplasma was validated with 202 coconut samples and a detection rate of above 95% was achieved. This newly established detection system was highly reliable and a way forward for controlling the WCLWD disease in Sri Lanka.

scholarly journals Comparative Evaluation of Sri Lanka Tall and Dwarf x Tall Coconut Hybrids for Tolerance to Weligama Coconut Leaf Wilt Disease in Sri Lanka

CORD ◽  
2016 ◽  
Vol 32 (2) ◽  
pp. 8
Author(s):  
S.A.C.N. Perera
Keyword(s):  
Sri Lanka ◽  
Disease Incidence ◽  
Severity Index ◽  
Wilt Disease ◽  
Lower Percentage ◽  
Close Proximity ◽  
Leaf Yellowing ◽  
Mixed Plantation ◽  
Index Value ◽  
Disease Pressure

Weligama Coconut Leaf Wilt Disease (WCLWD) is a phytoplasma disease found in Southern Sri Lanka. It is an incurable, debilitating disease resulting in yield loss and ultimate death of the palm and over 250,000 palms have been identified to be infected. Breeding coconuts for resistance is a viable option in managing incurable diseases and for this WCLWD resistant germplasm is needed. Accordingly, the objective of the current research was to investigate the comparable levels of WCLWD resistance of Sri Lanka tall and CRIC65 coconut cultivars which are favoured in Sri Lanka.          Eight coconut estates which were planted with Sri Lanka tall (SLT) and CRIC65 hybrids as a mixed plantation or in close proximity were observed. Out of them an extent of about 04 acres of one estate was selected for detailed analysis using the disease severity index developed based on the WCLWD symptoms; flaccidity, leaf yellowing and marginal necrosis of leaflets.          General observations indicated the presence of WCLWD in both SLT and the hybrid CRIC65. Marginal necrosis was at a minimal level in both the cultivars, while the other symptoms; flaccidity and yellowing scored higher values at all levels in the spiral in SLT than in hybrid CRIC65. Moreover, the hybrid coconut CRIC65 displayed lower percentage of disease incidence and significant reduction in the levels of the main symptom flaccidity.  As a result, the hybrid palms recorded significantly low disease index value than SLT. Moreover, disease incidence was observed to be low in properly managed estates irrespective of the cultivar. With the findings of the current study, coconut varieties SLGD and selected SLT which remain healthy under the same disease pressure can be recommended as parents in a breeding programme aiming at resistance/tolerance to WCLWD.

Fungal pathogens associated with wilting of Neolitsea cassia trees

2021 ◽  
Vol 04 (02) ◽  
pp. 172-176
Author(s):  
A. L. M. Zuhry ◽  
R. G. A. S. Rajapaksha ◽  
J. Kahawatta ◽  
S.​ Kohombange
Keyword(s):  
Sri Lanka ◽  
Tree Species ◽  
Fungal Pathogens ◽  
Infected Plant ◽  
Pathogenic Fungi ◽  
Fungal Species ◽  
Wilt Disease ◽  
Thiophanate Methyl ◽  
First Report ◽  
Collar Region

Neolitsea cassia, a tree species, belongs to family Lauraceae, is endemic to Sri Lanka. Few planted trees of Neolitsea cassia were severely affected by wilt disease. Two fungal pathogens were consistently isolated from collar region and roots of symptomatic trees. These two fungal species were identified as Colletotrichum and Pestalotiopsis by microscopic observations of conidia and culture characters of isolates on PDA. This is the first report of Colletotrichum and Pestalotiopsis species causing tree wilting of Neolitsea cassia in Sri Lanka. Application of 25 l of fungicide, Thiram + Thiophanate Methyl, 50+30% WP (Homai) solution (1g/l) around the base of each infected plant as a soil drenching was effectively controlled wilting of Neolitsea cassia caused by both pathogenic fungi.

scholarly journals Evaluation of coconut germplasm in Weligama and Matara area of the Southern Province of Sri Lanka for resistance to Weligama coconut leaf wilt disease

COCOS ◽  
2016 ◽  
Vol 21 (0) ◽  
pp. 15 ◽  
Author(s):  
S. A. C. N. Perera ◽  
H. M. N. B. Herath ◽  
H. T. R. Wijesekera ◽  
W. G. R. Subhathma ◽  
W. A. T. L. Weerakkody
Keyword(s):  
Sri Lanka ◽  
Wilt Disease ◽  
Southern Province

Abstract #604: Detection of Cardiovascular Risk Factors by Anthropometric Measures in Adults Living in an Urban Setting in Sri Lanka

2015 ◽  
Vol 21 ◽  
pp. 114-115
Author(s):  
Kavinga Gunawardane ◽  
Noel Somasundaram ◽  
Neil Thalagala ◽  
Pubudu Chulasiri ◽  
Sudath Fernando
Keyword(s):  
Risk Factors ◽  
Cardiovascular Risk ◽  
Sri Lanka ◽  
Cardiovascular Risk Factors ◽  
Urban Setting ◽  
Anthropometric Measures

Prevalence of Suicidal Ideation in Sri Lanka

Crisis ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Sudath Samaraweera ◽  
Athula Sumathipala ◽  
Sisira Siribaddana ◽  
S. Sivayogan ◽  
Dinesh Bhugra
Keyword(s):  
Suicidal Ideation ◽  
Sri Lanka ◽  
General Population ◽  
Suicide Attempts ◽  
National Average ◽  
The West ◽  
Suicide Methods ◽  
Suicide Rates ◽  
Completed Suicide ◽  
The World

Background: Suicidal ideation can often lead to suicide attempts and completed suicide. Studies have shown that Sri Lanka has one of the highest rates of suicide in the world but so far no studies have looked at prevalence of suicidal ideation in a general population in Sri Lanka. Aims: We wanted to determine the prevalence of suicidal ideation by randomly selecting six Divisional Secretariats (Dss) out of 17 in one district. This district is known to have higher than national average rates of suicide. Methods: 808 participants were interviewed using Sinhala versions of GHQ-30 and Beck’s Scale for Suicidal Ideation. Of these, 387 (48%) were males, and 421 (52%) were female. Results: On Beck’s Scale for Suicidal Ideation, 29 individuals (4%) had active suicidal ideation and 23 (3%) had passive suicidal ideation. The active suicidal ideators were young, physically ill and had higher levels of helplessness and hopelessness. Conclusions: The prevalence of suicidal ideation in Sri Lanka is lower than reported from the West and yet suicide rates are higher. Further work must explore cultural and religious factors.

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