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Effect of Post Harvest Treatments on the Incidence of Banana Disease During Storage Condition

N. Amin
Department of Horticulture, Bangladeh Agricultural Univerity, Mymeningh

M. K. Hassan
Department of Horticulture, Bangladeh Agricultural Univerity, Mymeningh

. Mahmud
Department of Agricultural Extension, Khamar Bari, Dhaka

S.M.S. Firoz
Department of Agricultural Extension, Khamar Bari, Dhaka

M.R. Karim
Department of Agricultural Extension, Khamar Bari, Dhaka

Abstract/ Executive Summary:

A study was conducted at the laboratory of the Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from August 2006 to January 2007 to observe the disease incidence and its severity during storage condition of banana varieties (Sabri, Champa and Mehersagar). Postharvest treatments included in this study were control, hot water (52±2°C), tilt (0.2%), unperforated polythene bag with or without KMnO₄, perforated polythene bag with or without KMnO₄, low temperature(12±2°C). The two-factor experiment was laid out in completely randomized design with three replications. Data reaveled that in all varieties, disease incidence progressed with duration of storage and significant variations were observed in percent disease severity level among the varieties. Disease incidence was the highest in Mehersagar (70.85%) than Sabri (67.07%) and Champa (53.78%) at the 8th day of storage. Disease severity level was the highest in Sabri (77.54%) than Mehersagar (61.88%) and Champa (64.70%) at 12th day of storage. Post harvest treatments exerted significant variation in influencing disease incidence and disease severity level during storage. The lowest incidence of disease and minimum disease severity (3.22%) was found in low temperature treated fruits as compared to those of the control (74.07%) fruits during the entire period of investigation.

Keywords: Disease incidence, Disease severity, Post harvest treatments and Banana varieties.

Location: Department of Horticulture, Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-2006

End Date: 00-01-2007

Program Area: Postharvest and Agro-processing

Commodity: Banana

Objectives:

1. To evaluate the effect of post harvest treatments on disease incidence and severity during storage condition of banana varieties (Sabri, Champa and Mehersagar).

Methodology:

The study was conducted at the laboratory of the Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from August 2006 to January 2007 to observe the disease incidence and severity during storage condition of banana varieties. The varieties were Sabri (V₁), Champa (V₂) and Mehersagar (V₃) and postharvest treatments included control (T₁), hot water (52±2°C) (T₂), tilt (0.2%) (T₃), unperforated polythene bag without (T₄) or with (T₅) KMnO₄, perforated polythene bag without (T₆) or with (T₇) KMnO₄, low temperature (12±2°C) (T₈). The temperature and relative humidity of the storage room ranged from 19-27°C and 73-85%, respectively. The two-factor experiment was laid out in completely randomized design (CRD) with three replications of 5 fruits. The mature fruits collected from farmer's garden near Madhupur, Tangail were uniform in size, shape, and free of any visible defects, disease, and insect infestations. The experimental fruits were washed in running water to remove darts and latex, and subsequently air-dried before imposing the treatments. Disease incidence means percentage of fruits infected with disease. This is measured by calculating the percentage of fruits infected. In the present investigation, black spots, blemishes and visible disease symptoms were considered as disease. Disease severity means percentage of fruits skin area diseased. This was subjectively assessed by naked eye. The means for all the treatments were statistically calculated and analyses of variances for all the parameters were performed by F-test. The significance of difference between the pairs of means was compared by least significant difference (LSD) test at 1% and 5% level of probability. For the percentage data, arc-sine transformations were carried out, and statistical analyses were performed on the transform data.

Source of Information: J. Agrofor. Environ. 7 (1): 11-14, 2013; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Varieties caused significant effect on the levels of disease severity during storage and ripening. Mehersagar showed slightly higher disease severity (2.62%) than Sabri (2.08%) and Champa (10.28%) at the 4th day of storage. Disease severity then increased sharply with the advancement of storage duration in all the varietis. At the 16th day of storage, severity level reached very high, and varietal differences were insignificant. Postharvest treatments exerted significant result in terms of disease severity. Disease severity increased with the increase of storage duration. During the earlier part of storage, tilt was found good to reduce incidence (1.59 and 8.47% at the 4th and 8th days of storage, respectively). Low temperature was found the best in reducing disease severity during the entire period of study (5.59% at the 16th day of storage). The reduced diseases due to tilt and low temperature were probable because of the supression of fungal growth. However polythene bags did not perform well in reducing disease, possibly due to increased humidity inside the bag and increased infections by anaerobic pathogens. The combined effect of variety and postharvest treatments were also found significant in influencing disease severity.

Knowledge Management: Journal