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Incidence and Severity of Leaf Blight Disease of Jackfruit Seedling (artocarpus Heterophyllus L.) in Bangladesh as Influenced by Weather Components

Md. Mostafizur Rahman
MS, Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207. Bangladesh.

H. E. M. Khairul Mazed
MS Student,
Department of Horticulture, Sher-eBangla Agricultural University, Dhaka-1207, Bangladesh

Israt Jahan Irin
Ph. D. Student
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207. Bangladesh

Jannatul Ferdous Moonmoon
MS Student
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207. Bangladesh.

Md. Hafizur Rahman
MS Student
Department of Agricultural Extension and Information System, Shere-Bangla Agricultural University, Dhaka-1207. Bangladesh.

Abstract/ Executive Summary:

The existing health situation of jackfruit seedling of nursery diseases of jackfruit species in Bangladesh is in a stage to be upgraded for successful fruit production to meet the national demand. Experiments were carried out during the period of July, 2012-October to, 2014 to study the incidence and severity of leaf blight of jackfruit seedling in some selected areas of Bangladesh on the Effect of weather components. From the experiment, the highest incidence (44.17%) was recorded in April (2013 & 2014) when the average temperature, relative humidity and rainfall were 21°C, 70.72% and 3.68 cm, respectively. On the other hand, the lowest incidence (3.21%) was recorded in January (2013 & 2014) having average temperature, relative humidity and rainfall 17.67°C, 74.90% and 0.56 cm, respectively. In the case of disease severity of jackfruit seedling the highest severity (38.59%) was recorded in April (2013 & 2014) when the average temperature, relative humidity and rainfall were 21°C, 70.72% and 3.68 cm, respectively. On the other hand, the lowest severity (1.27%) was recorded in January (2013 & 2014) having average temperature, relative humidity and rainfall 17.67°C, 74.90% and 0.56 cm, respectively.

Keywords: Jackfruit, Temperature, Rainfall, Relative humidity, Leaf blight, Disease.

Location: Sher-e-Bangla Agricultural University, Dhaka-1207 with 3 other districts of Bangladesh

Start Date: 00-07-2012

End Date: 00-10-2014

Program Area: Pest Management

Commodity: Diseases, Jackfruit

Objectives:

To know the appropriate amount of weather components such as temperature, relative humidity, and rainfall which can reduce the incidence and severity of leaf blight disease of jackfruit seedling in Bangladesh.

Methodology:

2.1 Experimental site and period: The study was carried out at Sher-e-Bangla Agricultural University, Dhaka-1207 with 3 other districts of Bangladesh and it was carried out from July, 2012-October to, 2014. 2.2 Preparation of nursery soil and seedlings: The substratum was prepared by mixing soil, sand and well-decomposed cow dung and sterilized with 5 ml formalin (40%) diluted with 20 ml water for 4 kg soil. The prepared soil was heaped in a square block. Soil heap was inocula. After 4 days of treatment, earthen pots were filled up with the sterilized soil. 2.3 Location of survey area: Prevalence of diseases occurring on Jackfruit seedlings raised in the selected nurseries was surveyed. The experiment was carried out in eight nurseries of Dhaka, Gazipur, Khagrachari and Barisal. The eight nurseries of four districts are surveyed. 2.4 Age and number of seedlings: Age of the jackfruit seedlings and a total number of seedlings in selected eight nurseries from July, 2012 to April, 2014. 2.5 Observation of the symptoms: Symptoms of the diseases were studied by visual observation. Sometimes hand lenses were used for critical observation of the disease and sometimes a disease was identified based on matching the observed symptoms in the infected plants with the symptoms published in Ber and other Jackfruit disease compendium. 2.6 Survey period: Altogether eight surveys were made during the period from July, 2012 to April, 2014. where First, second, third, fourth, fifth, sixth, seventh, and eighth surveys were made in July, 2012; October, 2012; January, 2013; April, 2013; July, 2013; October, 2013; January, 2014; and April, 2014 respectively. 2.7 Collection of diseased specimens: Diseased leaves were collected from the infected plants representing the different areas of the survey. The specimens were preserved in the laboratory following the standard procedure of preservation of disease specimens until isolation was made. 2.8 Data collection during the survey: During the survey in the nurseries, total numbers of jackfruit seedlings, as well as a number of diseased seedlings in the nurseries, were recorded. Then 30 seedlings were randomly selected for counting diseased leaves and disease-free leaves. Moreover, five leaves per plant were randomly selected to determine the disease severity. 2.9 Determination of disease incidence and disease severity: For calculation of incidence of the disease every seedling was counted in the nursery and also counted the infected seedlings and then expressed in percentage. The disease incidence of Jackfruit seedling was determined by the following formula (Rai and Mamatha, 2005):

Source of Information: International Journal of Multidisciplinary Research and Development 2015; 2(4): 82-86

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study, we can know that the highest incidence (44.17%) was recorded in April. On the other hand, the lowest incidence (3.21%) was recorded in January. In the case of the disease severity of jackfruit seedling, the highest severity (38.59%) was recorded in April. On the other hand, the lowest severity (1.27%) was recorded in January.

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