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Assessment of Floral Malformation of Mango in Major Mango Growing Regions of Bangladesh

M.M. Hossain
Plant Pathology Division, BARI

M. S. Islam
Plant Pathology Division, BARI

Abstract/ Executive Summary:

The study was conducted to assess the prevalence and severity of mango floral malformation during March to April 2014. Fifty locations were visited in five upazillas of Chapai Nawabganj districts with the objectives to confirm the status and update the existing statistics for the future planning and management. The disorder was found widely distributed with 100 percent prevalence. The maximum severity (5.71 %) was observed in Bholahat upazilla followed by Gomostapur (5.63 %). All the traditional cultivars were more or less affected. Among the varieties the highest severity (15.19 %) was recorded from Ashwina followed by BARI mango-3 (12.90 %). Ashwina is moderately susceptible (MS) while BARI mango-1 is moderately resistant and others are tolerant variety to the malady.

Keywords: Malformation, Mango, Fazli, Ashwina

Location: Chapai Nawabganj

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Pest Management

Commodity: Diseases, Mango

Objectives:

To assess the disease severity and to evaluate different cultivar status

Methodology:

Survey and evaluation of mango malformation were done on complete differentiation of healthy and malformed panicles during the growing period (March- April, 2014). This survey was conducted at five upazilla of Chapai Nawabganj district. Ten mango orchards were assessed in each upazilla. A total of 50 locations were visited in mango growing areas of Chapai Nawabganj district. A preform was designed to record limb and tree wise data at different locations. Sampled plants in different orchards ranged from 5 to 9 depending upon the orchard size with a total of 951. limbs and 317 trees. Three limbs having many small and large branches were selected on each tree at random. Diseased, healthy and total number of inflorescence was counted on each limb. Percent severity was calculated quantifying number of panicles affected with the objective to explore quantitative estimation of cultivar susceptibility.

Source of Information: Annual Research Report, Plant Pathology Division, BARI--2013-14

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Assessment of mango malformation in 50 different orchards of five upazillas of Chapai Nawabganj district revealed that it is widely distributed with 100% prevalence. No orchard was free from malformed heads. Among the five upazillas maximum disease incidence (60.66 %) was observed in Gomostapur upazilla followed by Bholahat (60.00 %). The lowest incidence (41.39 %) was observed in the orchard of Sadar upazilla. On the other hand maximum severity (5.71 %) was observed in Bholahat upazilla followed by Gomostapur (5.63 %). The lowest severity (4.06 %) was observed in the orchard of Sibganj upazilla. All the traditional cultivars were more or less affected. Among the varieties the highest severity (15.19 %) was recorded from Ashwina followed by BARI mango-3 (12.90 %). The lowest severity was recorded from BARI mango-1 (0.58%) followed by Fazli (1.86). Mango cultivar under investigation showed differential reaction to floral malformation. Among the cultivar Ashwina prove to be more susceptible showing moderately susceptible (MS) reaction to the malady with 15.19 % DI. While BARI mango-1 showed moderately resistant (MR) reaction. Rest cultivars were tolerant (T) to malformation disease.

It may be concluded from the study that no orchard is free from floral malformation disease. Among the surveyed area the maximum severity (5.71 %) was observed in Bholahat upazilla followed by Gomostapur (5.63 %). On the other hand Ashwina is moderately susceptible (MS) while BARI mango-1 is moderately resistant and others are tolerant variety to the malady.

Knowledge Management: Report/Proceedings